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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.05934">arXiv:2210.05934</a> <span> [<a href="https://arxiv.org/pdf/2210.05934">pdf</a>, <a href="https://arxiv.org/format/2210.05934">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Input optics systems of the KAGRA detector during O3GK </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Akutsu%2C+T">T. Akutsu</a>, <a href="/search/physics?searchtype=author&query=Ando%2C+M">M. Ando</a>, <a href="/search/physics?searchtype=author&query=Arai%2C+K">K. Arai</a>, <a href="/search/physics?searchtype=author&query=Arai%2C+Y">Y. Arai</a>, <a href="/search/physics?searchtype=author&query=Araki%2C+S">S. Araki</a>, <a href="/search/physics?searchtype=author&query=Araya%2C+A">A. Araya</a>, <a href="/search/physics?searchtype=author&query=Aritomi%2C+N">N. Aritomi</a>, <a href="/search/physics?searchtype=author&query=Asada%2C+H">H. Asada</a>, <a href="/search/physics?searchtype=author&query=Aso%2C+Y">Y. Aso</a>, <a href="/search/physics?searchtype=author&query=Bae%2C+S">S. Bae</a>, <a href="/search/physics?searchtype=author&query=Bae%2C+Y">Y. Bae</a>, <a href="/search/physics?searchtype=author&query=Baiotti%2C+L">L. Baiotti</a>, <a href="/search/physics?searchtype=author&query=Bajpai%2C+R">R. Bajpai</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+M+A">M. A. Barton</a>, <a href="/search/physics?searchtype=author&query=Cannon%2C+K">K. Cannon</a>, <a href="/search/physics?searchtype=author&query=Cao%2C+Z">Z. Cao</a>, <a href="/search/physics?searchtype=author&query=Capocasa%2C+E">E. Capocasa</a>, <a href="/search/physics?searchtype=author&query=Chan%2C+M">M. Chan</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+C">C. Chen</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+K">K. Chen</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+Y">Y. Chen</a>, <a href="/search/physics?searchtype=author&query=Chiang%2C+C">C-I. Chiang</a>, <a href="/search/physics?searchtype=author&query=Chu%2C+H">H. Chu</a>, <a href="/search/physics?searchtype=author&query=Chu%2C+Y">Y-K. Chu</a>, <a href="/search/physics?searchtype=author&query=Eguchi%2C+S">S. Eguchi</a> , et al. (228 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2210.05934v1-abstract-short" style="display: inline;"> KAGRA, the underground and cryogenic gravitational-wave detector, was operated for its solo observation from February 25th to March 10th, 2020, and its first joint observation with the GEO 600 detector from April 7th -- 21st, 2020 (O3GK). This study presents an overview of the input optics systems of the KAGRA detector, which consist of various optical systems, such as a laser source, its intensit… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.05934v1-abstract-full').style.display = 'inline'; document.getElementById('2210.05934v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.05934v1-abstract-full" style="display: none;"> KAGRA, the underground and cryogenic gravitational-wave detector, was operated for its solo observation from February 25th to March 10th, 2020, and its first joint observation with the GEO 600 detector from April 7th -- 21st, 2020 (O3GK). This study presents an overview of the input optics systems of the KAGRA detector, which consist of various optical systems, such as a laser source, its intensity and frequency stabilization systems, modulators, a Faraday isolator, mode-matching telescopes, and a high-power beam dump. These optics were successfully delivered to the KAGRA interferometer and operated stably during the observations. The laser frequency noise was observed to limit the detector sensitivity above a few kHz, whereas the laser intensity did not significantly limit the detector sensitivity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.05934v1-abstract-full').style.display = 'none'; document.getElementById('2210.05934v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2005.05574">arXiv:2005.05574</a> <span> [<a href="https://arxiv.org/pdf/2005.05574">pdf</a>, <a href="https://arxiv.org/ps/2005.05574">ps</a>, <a href="https://arxiv.org/format/2005.05574">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> </div> <p class="title is-5 mathjax"> Overview of KAGRA: Detector design and construction history </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Akutsu%2C+T">T. Akutsu</a>, <a href="/search/physics?searchtype=author&query=Ando%2C+M">M. Ando</a>, <a href="/search/physics?searchtype=author&query=Arai%2C+K">K. Arai</a>, <a href="/search/physics?searchtype=author&query=Arai%2C+Y">Y. Arai</a>, <a href="/search/physics?searchtype=author&query=Araki%2C+S">S. Araki</a>, <a href="/search/physics?searchtype=author&query=Araya%2C+A">A. Araya</a>, <a href="/search/physics?searchtype=author&query=Aritomi%2C+N">N. Aritomi</a>, <a href="/search/physics?searchtype=author&query=Aso%2C+Y">Y. Aso</a>, <a href="/search/physics?searchtype=author&query=Bae%2C+S+-">S. -W. Bae</a>, <a href="/search/physics?searchtype=author&query=Bae%2C+Y+-">Y. -B. Bae</a>, <a href="/search/physics?searchtype=author&query=Baiotti%2C+L">L. Baiotti</a>, <a href="/search/physics?searchtype=author&query=Bajpai%2C+R">R. Bajpai</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+M+A">M. A. Barton</a>, <a href="/search/physics?searchtype=author&query=Cannon%2C+K">K. Cannon</a>, <a href="/search/physics?searchtype=author&query=Capocasa%2C+E">E. Capocasa</a>, <a href="/search/physics?searchtype=author&query=Chan%2C+M+-">M. -L. Chan</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+C+-">C. -S. Chen</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+K+-">K. -H. Chen</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+Y+-">Y. -R. Chen</a>, <a href="/search/physics?searchtype=author&query=Chu%2C+H+-">H. -Y. Chu</a>, <a href="/search/physics?searchtype=author&query=Chu%2C+Y">Y-K. Chu</a>, <a href="/search/physics?searchtype=author&query=Eguchi%2C+S">S. Eguchi</a>, <a href="/search/physics?searchtype=author&query=Enomoto%2C+Y">Y. Enomoto</a>, <a href="/search/physics?searchtype=author&query=Flaminio%2C+R">R. Flaminio</a>, <a href="/search/physics?searchtype=author&query=Fujii%2C+Y">Y. Fujii</a> , et al. (175 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2005.05574v2-abstract-short" style="display: inline;"> KAGRA is a newly built gravitational-wave telescope, a laser interferometer comprising arms with a length of 3\,km, located in Kamioka, Gifu, Japan. KAGRA was constructed under the ground and it is operated using cryogenic mirrors that help in reducing the seismic and thermal noise. Both technologies are expected to provide directions for the future of gravitational-wave telescopes. In 2019, KAGRA… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.05574v2-abstract-full').style.display = 'inline'; document.getElementById('2005.05574v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2005.05574v2-abstract-full" style="display: none;"> KAGRA is a newly built gravitational-wave telescope, a laser interferometer comprising arms with a length of 3\,km, located in Kamioka, Gifu, Japan. KAGRA was constructed under the ground and it is operated using cryogenic mirrors that help in reducing the seismic and thermal noise. Both technologies are expected to provide directions for the future of gravitational-wave telescopes. In 2019, KAGRA finished all installations with the designed configuration, which we call the baseline KAGRA. In this occasion, we present an overview of the baseline KAGRA from various viewpoints in a series of of articles. In this article, we introduce the design configurations of KAGRA with its historical background. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.05574v2-abstract-full').style.display = 'none'; document.getElementById('2005.05574v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 July, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">33 pages, 10 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1910.00955">arXiv:1910.00955</a> <span> [<a href="https://arxiv.org/pdf/1910.00955">pdf</a>, <a href="https://arxiv.org/format/1910.00955">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1361-6382/ab5c95">10.1088/1361-6382/ab5c95 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> An arm length stabilization system for KAGRA and future gravitational-wave detectors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Akutsu%2C+T">T. Akutsu</a>, <a href="/search/physics?searchtype=author&query=Ando%2C+M">M. Ando</a>, <a href="/search/physics?searchtype=author&query=Arai%2C+K">K. Arai</a>, <a href="/search/physics?searchtype=author&query=Arai%2C+K">K. Arai</a>, <a href="/search/physics?searchtype=author&query=Arai%2C+Y">Y. Arai</a>, <a href="/search/physics?searchtype=author&query=Araki%2C+S">S. Araki</a>, <a href="/search/physics?searchtype=author&query=Araya%2C+A">A. Araya</a>, <a href="/search/physics?searchtype=author&query=Aritomi%2C+N">N. Aritomi</a>, <a href="/search/physics?searchtype=author&query=Aso%2C+Y">Y. Aso</a>, <a href="/search/physics?searchtype=author&query=Bae%2C+S">S. Bae</a>, <a href="/search/physics?searchtype=author&query=Bae%2C+Y">Y. Bae</a>, <a href="/search/physics?searchtype=author&query=Baiotti%2C+L">L. Baiotti</a>, <a href="/search/physics?searchtype=author&query=Bajpai%2C+R">R. Bajpai</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+M+A">M. A. Barton</a>, <a href="/search/physics?searchtype=author&query=Cannon%2C+K">K. Cannon</a>, <a href="/search/physics?searchtype=author&query=Capocasa%2C+E">E. Capocasa</a>, <a href="/search/physics?searchtype=author&query=Chan%2C+M">M. Chan</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+C">C. Chen</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+K">K. Chen</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+Y">Y. Chen</a>, <a href="/search/physics?searchtype=author&query=Chu%2C+H">H. Chu</a>, <a href="/search/physics?searchtype=author&query=Chu%2C+Y">Y-K. Chu</a>, <a href="/search/physics?searchtype=author&query=Doi%2C+K">K. Doi</a>, <a href="/search/physics?searchtype=author&query=Eguchi%2C+S">S. Eguchi</a>, <a href="/search/physics?searchtype=author&query=Enomoto%2C+Y">Y. Enomoto</a> , et al. (181 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1910.00955v2-abstract-short" style="display: inline;"> Modern ground-based gravitational wave (GW) detectors require a complex interferometer configuration with multiple coupled optical cavities. Since achieving the resonances of the arm cavities is the most challenging among the lock acquisition processes, the scheme called arm length stabilization (ALS) had been employed for lock acquisition of the arm cavities. We designed a new type of the ALS, wh… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.00955v2-abstract-full').style.display = 'inline'; document.getElementById('1910.00955v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1910.00955v2-abstract-full" style="display: none;"> Modern ground-based gravitational wave (GW) detectors require a complex interferometer configuration with multiple coupled optical cavities. Since achieving the resonances of the arm cavities is the most challenging among the lock acquisition processes, the scheme called arm length stabilization (ALS) had been employed for lock acquisition of the arm cavities. We designed a new type of the ALS, which is compatible with the interferometers having long arms like the next generation GW detectors. The features of the new ALS are that the control configuration is simpler than those of previous ones and that it is not necessary to lay optical fibers for the ALS along the kilometer-long arms of the detector. Along with simulations of its noise performance, an experimental test of the new ALS was performed utilizing a single arm cavity of KAGRA. This paper presents the first results of the test where we demonstrated that lock acquisition of the arm cavity was achieved using the new ALS and residual noise was measured to be $8.2\,\mathrm{Hz}$ in units of frequency, which is smaller than the linewidth of the arm cavity and thus low enough to lock the full interferometer of KAGRA in a repeatable and reliable manner. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.00955v2-abstract-full').style.display = 'none'; document.getElementById('1910.00955v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 November, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 October, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">21 pages, 8figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Class. Quantum Grav. 37 (2020) 035004 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1901.03569">arXiv:1901.03569</a> <span> [<a href="https://arxiv.org/pdf/1901.03569">pdf</a>, <a href="https://arxiv.org/ps/1901.03569">ps</a>, <a href="https://arxiv.org/format/1901.03569">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1361-6382/ab28a9">10.1088/1361-6382/ab28a9 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First cryogenic test operation of underground km-scale gravitational-wave observatory KAGRA </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=KAGRA+Collaboration"> KAGRA Collaboration</a>, <a href="/search/physics?searchtype=author&query=Akutsu%2C+T">T. Akutsu</a>, <a href="/search/physics?searchtype=author&query=Ando%2C+M">M. Ando</a>, <a href="/search/physics?searchtype=author&query=Arai%2C+K">K. Arai</a>, <a href="/search/physics?searchtype=author&query=Arai%2C+Y">Y. Arai</a>, <a href="/search/physics?searchtype=author&query=Araki%2C+S">S. Araki</a>, <a href="/search/physics?searchtype=author&query=Araya%2C+A">A. Araya</a>, <a href="/search/physics?searchtype=author&query=Aritomi%2C+N">N. Aritomi</a>, <a href="/search/physics?searchtype=author&query=Asada%2C+H">H. Asada</a>, <a href="/search/physics?searchtype=author&query=Aso%2C+Y">Y. Aso</a>, <a href="/search/physics?searchtype=author&query=Atsuta%2C+S">S. Atsuta</a>, <a href="/search/physics?searchtype=author&query=Awai%2C+K">K. Awai</a>, <a href="/search/physics?searchtype=author&query=Bae%2C+S">S. Bae</a>, <a href="/search/physics?searchtype=author&query=Baiotti%2C+L">L. Baiotti</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+M+A">M. A. Barton</a>, <a href="/search/physics?searchtype=author&query=Cannon%2C+K">K. Cannon</a>, <a href="/search/physics?searchtype=author&query=Capocasa%2C+E">E. Capocasa</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+C">C-S. Chen</a>, <a href="/search/physics?searchtype=author&query=Chiu%2C+T">T-W. Chiu</a>, <a href="/search/physics?searchtype=author&query=Cho%2C+K">K. Cho</a>, <a href="/search/physics?searchtype=author&query=Chu%2C+Y">Y-K. Chu</a>, <a href="/search/physics?searchtype=author&query=Craig%2C+K">K. Craig</a>, <a href="/search/physics?searchtype=author&query=Creus%2C+W">W. Creus</a>, <a href="/search/physics?searchtype=author&query=Doi%2C+K">K. Doi</a>, <a href="/search/physics?searchtype=author&query=Eda%2C+K">K. Eda</a> , et al. (179 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1901.03569v1-abstract-short" style="display: inline;"> KAGRA is a second-generation interferometric gravitational-wave detector with 3-km arms constructed at Kamioka, Gifu in Japan. It is now in its final installation phase, which we call bKAGRA (baseline KAGRA), with scientific observations expected to begin in late 2019. One of the advantages of KAGRA is its underground location of at least 200 m below the ground surface, which brings small seismic… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.03569v1-abstract-full').style.display = 'inline'; document.getElementById('1901.03569v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1901.03569v1-abstract-full" style="display: none;"> KAGRA is a second-generation interferometric gravitational-wave detector with 3-km arms constructed at Kamioka, Gifu in Japan. It is now in its final installation phase, which we call bKAGRA (baseline KAGRA), with scientific observations expected to begin in late 2019. One of the advantages of KAGRA is its underground location of at least 200 m below the ground surface, which brings small seismic motion at low frequencies and high stability of the detector. Another advantage is that it cools down the sapphire test mass mirrors to cryogenic temperatures to reduce thermal noise. In April-May 2018, we have operated a 3-km Michelson interferometer with a cryogenic test mass for 10 days, which was the first time that km-scale interferometer was operated at cryogenic temperatures. In this article, we report the results of this "bKAGRA Phase 1" operation. We have demonstrated the feasibility of 3-km interferometer alignment and control with cryogenic mirrors. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.03569v1-abstract-full').style.display = 'none'; document.getElementById('1901.03569v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">23 pages, 11 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JGW-P1809289 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Classical and Quantum Gravity 36, 165008 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1901.03053">arXiv:1901.03053</a> <span> [<a href="https://arxiv.org/pdf/1901.03053">pdf</a>, <a href="https://arxiv.org/format/1901.03053">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1361-6382/ab0fcb">10.1088/1361-6382/ab0fcb <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Vibration isolation system with a compact damping system for power recycling mirrors of KAGRA </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Akiyama%2C+Y">Y. Akiyama</a>, <a href="/search/physics?searchtype=author&query=Akutsu%2C+T">T. Akutsu</a>, <a href="/search/physics?searchtype=author&query=Ando%2C+M">M. Ando</a>, <a href="/search/physics?searchtype=author&query=Arai%2C+K">K. Arai</a>, <a href="/search/physics?searchtype=author&query=Arai%2C+Y">Y. Arai</a>, <a href="/search/physics?searchtype=author&query=Araki%2C+S">S. Araki</a>, <a href="/search/physics?searchtype=author&query=Araya%2C+A">A. Araya</a>, <a href="/search/physics?searchtype=author&query=Aritomi%2C+N">N. Aritomi</a>, <a href="/search/physics?searchtype=author&query=Asada%2C+H">H. Asada</a>, <a href="/search/physics?searchtype=author&query=Aso%2C+Y">Y. Aso</a>, <a href="/search/physics?searchtype=author&query=Bae%2C+S">S. Bae</a>, <a href="/search/physics?searchtype=author&query=Baiotti%2C+L">L. Baiotti</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+M+A">M. A. Barton</a>, <a href="/search/physics?searchtype=author&query=Cannon%2C+K">K. Cannon</a>, <a href="/search/physics?searchtype=author&query=Capocasa%2C+E">E. Capocasa</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+C">C-S. Chen</a>, <a href="/search/physics?searchtype=author&query=Chiu%2C+T">T-W. Chiu</a>, <a href="/search/physics?searchtype=author&query=Cho%2C+K">K. Cho</a>, <a href="/search/physics?searchtype=author&query=Chu%2C+Y">Y-K. Chu</a>, <a href="/search/physics?searchtype=author&query=Craig%2C+K">K. Craig</a>, <a href="/search/physics?searchtype=author&query=Dattilo%2C+V">V. Dattilo</a>, <a href="/search/physics?searchtype=author&query=Doi%2C+K">K. Doi</a>, <a href="/search/physics?searchtype=author&query=Enomoto%2C+Y">Y. Enomoto</a>, <a href="/search/physics?searchtype=author&query=Flaminio%2C+R">R. Flaminio</a>, <a href="/search/physics?searchtype=author&query=Fujii%2C+Y">Y. Fujii</a> , et al. (149 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1901.03053v1-abstract-short" style="display: inline;"> A vibration isolation system called Type-Bp system used for power recycling mirrors has been developed for KAGRA, the interferometric gravitational-wave observatory in Japan. A suspension of the Type-Bp system passively isolates an optic from seismic vibration using three main pendulum stages equipped with two vertical vibration isolation systems. A compact reaction mass around each of the main st… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.03053v1-abstract-full').style.display = 'inline'; document.getElementById('1901.03053v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1901.03053v1-abstract-full" style="display: none;"> A vibration isolation system called Type-Bp system used for power recycling mirrors has been developed for KAGRA, the interferometric gravitational-wave observatory in Japan. A suspension of the Type-Bp system passively isolates an optic from seismic vibration using three main pendulum stages equipped with two vertical vibration isolation systems. A compact reaction mass around each of the main stages allows for achieving sufficient damping performance with a simple feedback as well as vibration isolation ratio. Three Type-Bp systems were installed in KAGRA, and were proved to satisfy the requirements on the damping performance, and also on estimated residual displacement of the optics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.03053v1-abstract-full').style.display = 'none'; document.getElementById('1901.03053v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1811.08079">arXiv:1811.08079</a> <span> [<a href="https://arxiv.org/pdf/1811.08079">pdf</a>, <a href="https://arxiv.org/ps/1811.08079">ps</a>, <a href="https://arxiv.org/format/1811.08079">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41550-018-0658-y">10.1038/s41550-018-0658-y <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> KAGRA: 2.5 Generation Interferometric Gravitational Wave Detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Akutsu%2C+T">T. Akutsu</a>, <a href="/search/physics?searchtype=author&query=Ando%2C+M">M. Ando</a>, <a href="/search/physics?searchtype=author&query=Arai%2C+K">K. Arai</a>, <a href="/search/physics?searchtype=author&query=Arai%2C+Y">Y. Arai</a>, <a href="/search/physics?searchtype=author&query=Araki%2C+S">S. Araki</a>, <a href="/search/physics?searchtype=author&query=Araya%2C+A">A. Araya</a>, <a href="/search/physics?searchtype=author&query=Aritomi%2C+N">N. Aritomi</a>, <a href="/search/physics?searchtype=author&query=Asada%2C+H">H. Asada</a>, <a href="/search/physics?searchtype=author&query=Aso%2C+Y">Y. Aso</a>, <a href="/search/physics?searchtype=author&query=Atsuta%2C+S">S. Atsuta</a>, <a href="/search/physics?searchtype=author&query=Awai%2C+K">K. Awai</a>, <a href="/search/physics?searchtype=author&query=Bae%2C+S">S. Bae</a>, <a href="/search/physics?searchtype=author&query=Baiotti%2C+L">L. Baiotti</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+M+A">M. A. Barton</a>, <a href="/search/physics?searchtype=author&query=Cannon%2C+K">K. Cannon</a>, <a href="/search/physics?searchtype=author&query=Capocasa%2C+E">E. Capocasa</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+C">C-S. Chen</a>, <a href="/search/physics?searchtype=author&query=Chiu%2C+T">T-W. Chiu</a>, <a href="/search/physics?searchtype=author&query=Cho%2C+K">K. Cho</a>, <a href="/search/physics?searchtype=author&query=Chu%2C+Y">Y-K. Chu</a>, <a href="/search/physics?searchtype=author&query=Craig%2C+K">K. Craig</a>, <a href="/search/physics?searchtype=author&query=Creus%2C+W">W. Creus</a>, <a href="/search/physics?searchtype=author&query=Doi%2C+K">K. Doi</a>, <a href="/search/physics?searchtype=author&query=Eda%2C+K">K. Eda</a>, <a href="/search/physics?searchtype=author&query=Enomoto%2C+Y">Y. Enomoto</a> , et al. (169 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1811.08079v1-abstract-short" style="display: inline;"> The recent detections of gravitational waves (GWs) reported by LIGO/Virgo collaborations have made significant impact on physics and astronomy. A global network of GW detectors will play a key role to solve the unknown nature of the sources in coordinated observations with astronomical telescopes and detectors. Here we introduce KAGRA (former name LCGT; Large-scale Cryogenic Gravitational wave Tel… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.08079v1-abstract-full').style.display = 'inline'; document.getElementById('1811.08079v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1811.08079v1-abstract-full" style="display: none;"> The recent detections of gravitational waves (GWs) reported by LIGO/Virgo collaborations have made significant impact on physics and astronomy. A global network of GW detectors will play a key role to solve the unknown nature of the sources in coordinated observations with astronomical telescopes and detectors. Here we introduce KAGRA (former name LCGT; Large-scale Cryogenic Gravitational wave Telescope), a new GW detector with two 3-km baseline arms arranged in the shape of an "L", located inside the Mt. Ikenoyama, Kamioka, Gifu, Japan. KAGRA's design is similar to those of the second generations such as Advanced LIGO/Virgo, but it will be operating at the cryogenic temperature with sapphire mirrors. This low temperature feature is advantageous for improving the sensitivity around 100 Hz and is considered as an important feature for the third generation GW detector concept (e.g. Einstein Telescope of Europe or Cosmic Explorer of USA). Hence, KAGRA is often called as a 2.5 generation GW detector based on laser interferometry. The installation and commissioning of KAGRA is underway and its cryogenic systems have been successfully tested in May, 2018. KAGRA's first observation run is scheduled in late 2019, aiming to join the third observation run (O3) of the advanced LIGO/Virgo network. In this work, we describe a brief history of KAGRA and highlights of main feature. We also discuss the prospects of GW observation with KAGRA in the era of O3. When operating along with the existing GW detectors, KAGRA will be helpful to locate a GW source more accurately and to determine the source parameters with higher precision, providing information for follow-up observations of a GW trigger candidate. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.08079v1-abstract-full').style.display = 'none'; document.getElementById('1811.08079v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 November, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 3 figures (quality of some figures has been reduced)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JGW-P1809243 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Astronomy 3, 35 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1712.00148">arXiv:1712.00148</a> <span> [<a href="https://arxiv.org/pdf/1712.00148">pdf</a>, <a href="https://arxiv.org/ps/1712.00148">ps</a>, <a href="https://arxiv.org/format/1712.00148">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1093/ptep/ptx180">10.1093/ptep/ptx180 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Construction of KAGRA: an Underground Gravitational Wave Observatory </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Akutsu%2C+T">T. Akutsu</a>, <a href="/search/physics?searchtype=author&query=Ando%2C+M">M. Ando</a>, <a href="/search/physics?searchtype=author&query=Araki%2C+S">S. Araki</a>, <a href="/search/physics?searchtype=author&query=Araya%2C+A">A. Araya</a>, <a href="/search/physics?searchtype=author&query=Arima%2C+T">T. Arima</a>, <a href="/search/physics?searchtype=author&query=Aritomi%2C+N">N. Aritomi</a>, <a href="/search/physics?searchtype=author&query=Asada%2C+H">H. Asada</a>, <a href="/search/physics?searchtype=author&query=Aso%2C+Y">Y. Aso</a>, <a href="/search/physics?searchtype=author&query=Atsuta%2C+S">S. Atsuta</a>, <a href="/search/physics?searchtype=author&query=Awai%2C+K">K. Awai</a>, <a href="/search/physics?searchtype=author&query=Baiotti%2C+L">L. Baiotti</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+M+A">M. A. Barton</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+D">D. Chen</a>, <a href="/search/physics?searchtype=author&query=Cho%2C+K">K. Cho</a>, <a href="/search/physics?searchtype=author&query=Craig%2C+K">K. Craig</a>, <a href="/search/physics?searchtype=author&query=DeSalvo%2C+R">R. DeSalvo</a>, <a href="/search/physics?searchtype=author&query=Doi%2C+K">K. Doi</a>, <a href="/search/physics?searchtype=author&query=Eda%2C+K">K. Eda</a>, <a href="/search/physics?searchtype=author&query=Enomoto%2C+Y">Y. Enomoto</a>, <a href="/search/physics?searchtype=author&query=Flaminio%2C+R">R. Flaminio</a>, <a href="/search/physics?searchtype=author&query=Fujibayashi%2C+S">S. Fujibayashi</a>, <a href="/search/physics?searchtype=author&query=Fujii%2C+Y">Y. Fujii</a>, <a href="/search/physics?searchtype=author&query=Fujimoto%2C+M+-">M. -K. Fujimoto</a>, <a href="/search/physics?searchtype=author&query=Fukushima%2C+M">M. Fukushima</a>, <a href="/search/physics?searchtype=author&query=Furuhata%2C+T">T. Furuhata</a> , et al. (202 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1712.00148v2-abstract-short" style="display: inline;"> Major construction and initial-phase operation of a second-generation gravitational-wave detector KAGRA has been completed. The entire 3-km detector is installed underground in a mine in order to be isolated from background seismic vibrations on the surface. This allows us to achieve a good sensitivity at low frequencies and high stability of the detector. Bare-bones equipment for the interferomet… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.00148v2-abstract-full').style.display = 'inline'; document.getElementById('1712.00148v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1712.00148v2-abstract-full" style="display: none;"> Major construction and initial-phase operation of a second-generation gravitational-wave detector KAGRA has been completed. The entire 3-km detector is installed underground in a mine in order to be isolated from background seismic vibrations on the surface. This allows us to achieve a good sensitivity at low frequencies and high stability of the detector. Bare-bones equipment for the interferometer operation has been installed and the first test run was accomplished in March and April of 2016 with a rather simple configuration. The initial configuration of KAGRA is named {\it iKAGRA}. In this paper, we summarize the construction of KAGRA, including the study of the advantages and challenges of building an underground detector and the operation of the iKAGRA interferometer together with the geophysics interferometer that has been constructed in the same tunnel. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.00148v2-abstract-full').style.display = 'none'; document.getElementById('1712.00148v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 December, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Resolution of some figures has been decreased from its original version submitted to a journal</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Progress of Theoretical and Experimental Physics, Vol 2018, 1, 013F01 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1710.04823">arXiv:1710.04823</a> <span> [<a href="https://arxiv.org/pdf/1710.04823">pdf</a>, <a href="https://arxiv.org/ps/1710.04823">ps</a>, <a href="https://arxiv.org/format/1710.04823">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-6596/1342/1/012014">10.1088/1742-6596/1342/1/012014 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The status of KAGRA underground cryogenic gravitational wave telescope </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=KAGRA+Collaboration"> KAGRA Collaboration</a>, <a href="/search/physics?searchtype=author&query=Akutsu%2C+T">T. Akutsu</a>, <a href="/search/physics?searchtype=author&query=Ando%2C+M">M. Ando</a>, <a href="/search/physics?searchtype=author&query=Araya%2C+A">A. Araya</a>, <a href="/search/physics?searchtype=author&query=Aritomi%2C+N">N. Aritomi</a>, <a href="/search/physics?searchtype=author&query=Asada%2C+H">H. Asada</a>, <a href="/search/physics?searchtype=author&query=Aso%2C+Y">Y. Aso</a>, <a href="/search/physics?searchtype=author&query=Atsuta%2C+S">S. Atsuta</a>, <a href="/search/physics?searchtype=author&query=Awai%2C+K">K. Awai</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+M+A">M. A. Barton</a>, <a href="/search/physics?searchtype=author&query=Cannon%2C+K">K. Cannon</a>, <a href="/search/physics?searchtype=author&query=Craig%2C+K">K. Craig</a>, <a href="/search/physics?searchtype=author&query=Creus%2C+W">W. Creus</a>, <a href="/search/physics?searchtype=author&query=Doi%2C+K">K. Doi</a>, <a href="/search/physics?searchtype=author&query=Eda%2C+K">K. Eda</a>, <a href="/search/physics?searchtype=author&query=Enomoto%2C+Y">Y. Enomoto</a>, <a href="/search/physics?searchtype=author&query=Flaminio%2C+R">R. Flaminio</a>, <a href="/search/physics?searchtype=author&query=Fujii%2C+Y">Y. Fujii</a>, <a href="/search/physics?searchtype=author&query=Fujimoto%2C+M+-">M. -K. Fujimoto</a>, <a href="/search/physics?searchtype=author&query=Furuhata%2C+T">T. Furuhata</a>, <a href="/search/physics?searchtype=author&query=Haino%2C+S">S. Haino</a>, <a href="/search/physics?searchtype=author&query=Hasegawa%2C+K">K. Hasegawa</a>, <a href="/search/physics?searchtype=author&query=Hashino%2C+K">K. Hashino</a>, <a href="/search/physics?searchtype=author&query=Hayama%2C+K">K. Hayama</a>, <a href="/search/physics?searchtype=author&query=Hirobayashi%2C+S">S. Hirobayashi</a> , et al. (126 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1710.04823v1-abstract-short" style="display: inline;"> KAGRA is a 3-km interferometric gravitational wave telescope located in the Kamioka mine in Japan. It is the first km-class gravitational wave telescope constructed underground to reduce seismic noise, and the first km-class telescope to use cryogenic cooling of test masses to reduce thermal noise. The construction of the infrastructure to house the interferometer in the tunnel, and the initial ph… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.04823v1-abstract-full').style.display = 'inline'; document.getElementById('1710.04823v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1710.04823v1-abstract-full" style="display: none;"> KAGRA is a 3-km interferometric gravitational wave telescope located in the Kamioka mine in Japan. It is the first km-class gravitational wave telescope constructed underground to reduce seismic noise, and the first km-class telescope to use cryogenic cooling of test masses to reduce thermal noise. The construction of the infrastructure to house the interferometer in the tunnel, and the initial phase operation of the interferometer with a simple 3-km Michelson configuration have been completed. The first cryogenic operation is expected in 2018, and the observing runs with a full interferometer are expected in 2020s. The basic interferometer configuration and the current status of KAGRA are described. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.04823v1-abstract-full').style.display = 'none'; document.getElementById('1710.04823v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 October, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 2 figures. Proceedings for XV International Conference on Topics in Astroparticle and Underground Physics (TAUP2017), Sudbury, July 24-28, 2017</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JGW-P1707191 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys.: Conf. Ser. 1342, 012014 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1709.02574">arXiv:1709.02574</a> <span> [<a href="https://arxiv.org/pdf/1709.02574">pdf</a>, <a href="https://arxiv.org/ps/1709.02574">ps</a>, <a href="https://arxiv.org/format/1709.02574">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1361-6382/aa90e3">10.1088/1361-6382/aa90e3 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Mirror actuation design for the interferometer control of the KAGRA gravitational wave telescope </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Michimura%2C+Y">Yuta Michimura</a>, <a href="/search/physics?searchtype=author&query=Shimoda%2C+T">Tomofumi Shimoda</a>, <a href="/search/physics?searchtype=author&query=Miyamoto%2C+T">Takahiro Miyamoto</a>, <a href="/search/physics?searchtype=author&query=Shoda%2C+A">Ayaka Shoda</a>, <a href="/search/physics?searchtype=author&query=Okutomi%2C+K">Koki Okutomi</a>, <a href="/search/physics?searchtype=author&query=Fujii%2C+Y">Yoshinori Fujii</a>, <a href="/search/physics?searchtype=author&query=Tanaka%2C+H">Hiroki Tanaka</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+M+A">Mark A. Barton</a>, <a href="/search/physics?searchtype=author&query=Takahashi%2C+R">Ryutaro Takahashi</a>, <a href="/search/physics?searchtype=author&query=Aso%2C+Y">Yoichi Aso</a>, <a href="/search/physics?searchtype=author&query=Akutsu%2C+T">Tomotada Akutsu</a>, <a href="/search/physics?searchtype=author&query=Ando%2C+M">Masaki Ando</a>, <a href="/search/physics?searchtype=author&query=Enomoto%2C+Y">Yutaro Enomoto</a>, <a href="/search/physics?searchtype=author&query=Flaminio%2C+R">Raffaele Flaminio</a>, <a href="/search/physics?searchtype=author&query=Hayama%2C+K">Kazuhiro Hayama</a>, <a href="/search/physics?searchtype=author&query=Hirose%2C+E">Eiichi Hirose</a>, <a href="/search/physics?searchtype=author&query=Inoue%2C+Y">Yuki Inoue</a>, <a href="/search/physics?searchtype=author&query=Kajita%2C+T">Takaaki Kajita</a>, <a href="/search/physics?searchtype=author&query=Kamiizumi%2C+M">Masahiro Kamiizumi</a>, <a href="/search/physics?searchtype=author&query=Kawamura%2C+S">Seiji Kawamura</a>, <a href="/search/physics?searchtype=author&query=Kokeyama%2C+K">Keiko Kokeyama</a>, <a href="/search/physics?searchtype=author&query=Komori%2C+K">Kentaro Komori</a>, <a href="/search/physics?searchtype=author&query=Kumar%2C+R">Rahul Kumar</a>, <a href="/search/physics?searchtype=author&query=Miyakawa%2C+O">Osamu Miyakawa</a>, <a href="/search/physics?searchtype=author&query=Nagano%2C+K">Koji Nagano</a> , et al. (14 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1709.02574v3-abstract-short" style="display: inline;"> KAGRA is a 3-km cryogenic interferometric gravitational wave telescope located at an underground site in Japan. In order to achieve its target sensitivity, the relative positions of the mirrors of the interferometer must be finely adjusted with attached actuators. We have developed a model to simulate the length control loops of the KAGRA interferometer with realistic suspension responses and vari… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1709.02574v3-abstract-full').style.display = 'inline'; document.getElementById('1709.02574v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1709.02574v3-abstract-full" style="display: none;"> KAGRA is a 3-km cryogenic interferometric gravitational wave telescope located at an underground site in Japan. In order to achieve its target sensitivity, the relative positions of the mirrors of the interferometer must be finely adjusted with attached actuators. We have developed a model to simulate the length control loops of the KAGRA interferometer with realistic suspension responses and various noises for mirror actuation. Using our model, we have designed the actuation parameters to have sufficient force range to acquire lock as well as to control all the length degrees of freedom without introducing excess noise. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1709.02574v3-abstract-full').style.display = 'none'; document.getElementById('1709.02574v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 June, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 September, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">21 pages, 7 figures (typo in p.12 on magnetic field gradient fixed for v3)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JGW-P1707051 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Classical and Quantum Gravity 34, 225001(2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1604.00439">arXiv:1604.00439</a> <span> [<a href="https://arxiv.org/pdf/1604.00439">pdf</a>, <a href="https://arxiv.org/format/1604.00439">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.93.112004">10.1103/PhysRevD.93.112004 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Sensitivity of the Advanced LIGO Detectors at the Beginning of Gravitational Wave Astronomy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Martynov%2C+D+V">D. V. Martynov</a>, <a href="/search/physics?searchtype=author&query=Hall%2C+E+D">E. D. Hall</a>, <a href="/search/physics?searchtype=author&query=Abbott%2C+B+P">B. P. Abbott</a>, <a href="/search/physics?searchtype=author&query=Abbott%2C+R">R. Abbott</a>, <a href="/search/physics?searchtype=author&query=Abbott%2C+T+D">T. D. Abbott</a>, <a href="/search/physics?searchtype=author&query=Adams%2C+C">C. Adams</a>, <a href="/search/physics?searchtype=author&query=Adhikari%2C+R+X">R. X. Adhikari</a>, <a href="/search/physics?searchtype=author&query=Anderson%2C+R+A">R. A. Anderson</a>, <a href="/search/physics?searchtype=author&query=Anderson%2C+S+B">S. B. Anderson</a>, <a href="/search/physics?searchtype=author&query=Arai%2C+K">K. Arai</a>, <a href="/search/physics?searchtype=author&query=Arain%2C+M+A">M. A. Arain</a>, <a href="/search/physics?searchtype=author&query=Aston%2C+S+M">S. M. Aston</a>, <a href="/search/physics?searchtype=author&query=Austin%2C+L">L. Austin</a>, <a href="/search/physics?searchtype=author&query=Ballmer%2C+S+W">S. W. Ballmer</a>, <a href="/search/physics?searchtype=author&query=Barbet%2C+M">M. Barbet</a>, <a href="/search/physics?searchtype=author&query=Barker%2C+D">D. Barker</a>, <a href="/search/physics?searchtype=author&query=Barr%2C+B">B. Barr</a>, <a href="/search/physics?searchtype=author&query=Barsotti%2C+L">L. Barsotti</a>, <a href="/search/physics?searchtype=author&query=Bartlett%2C+J">J. Bartlett</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+M+A">M. A. Barton</a>, <a href="/search/physics?searchtype=author&query=Bartos%2C+I">I. Bartos</a>, <a href="/search/physics?searchtype=author&query=Batch%2C+J+C">J. C. Batch</a>, <a href="/search/physics?searchtype=author&query=Bell%2C+A+S">A. S. Bell</a>, <a href="/search/physics?searchtype=author&query=Belopolski%2C+I">I. Belopolski</a>, <a href="/search/physics?searchtype=author&query=Bergman%2C+J">J. Bergman</a> , et al. (239 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1604.00439v3-abstract-short" style="display: inline;"> The Laser Interferometer Gravitational Wave Observatory (LIGO) consists of two widely separated 4 km laser interferometers designed to detect gravitational waves from distant astrophysical sources in the frequency range from 10 Hz to 10 kHz. The first observation run of the Advanced LIGO detectors started in September 2015 and ended in January 2016. A strain sensitivity of better than… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1604.00439v3-abstract-full').style.display = 'inline'; document.getElementById('1604.00439v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1604.00439v3-abstract-full" style="display: none;"> The Laser Interferometer Gravitational Wave Observatory (LIGO) consists of two widely separated 4 km laser interferometers designed to detect gravitational waves from distant astrophysical sources in the frequency range from 10 Hz to 10 kHz. The first observation run of the Advanced LIGO detectors started in September 2015 and ended in January 2016. A strain sensitivity of better than $10^{-23}/\sqrt{\text{Hz}}$ was achieved around 100 Hz. Understanding both the fundamental and the technical noise sources was critical for increasing the observable volume in the universe. The average distance at which coalescing binary black hole systems with individual masses of 30 $M_\odot$ could be detected was 1.3 Gpc. Similarly, the range for binary neutron star inspirals was about 75 Mpc. With respect to the initial detectors, the observable volume of Universe increased respectively by a factor 69 and 43. These improvements allowed Advanced LIGO to detect the gravitational wave signal from the binary black hole coalescence, known as GW150914. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1604.00439v3-abstract-full').style.display = 'none'; document.getElementById('1604.00439v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 February, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 April, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 93, 112004 (2016) </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg> <a href="https://info.arxiv.org/help/contact.html"> Contact</a> </li> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>subscribe to arXiv mailings</title><desc>Click here to subscribe</desc><path d="M476 3.2L12.5 270.6c-18.1 10.4-15.8 35.6 2.2 43.2L121 358.4l287.3-253.2c5.5-4.9 13.3 2.6 8.6 8.3L176 407v80.5c0 23.6 28.5 32.9 42.5 15.8L282 426l124.6 52.2c14.2 6 30.4-2.9 33-18.2l72-432C515 7.8 493.3-6.8 476 3.2z"/></svg> <a href="https://info.arxiv.org/help/subscribe"> Subscribe</a> </li> </ul> </div> </div> </div>   <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/license/index.html">Copyright</a></li> <li><a href="https://info.arxiv.org/help/policies/privacy_policy.html">Privacy Policy</a></li> </ul> </div> <div class="column sorry-app-links"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/web_accessibility.html">Web Accessibility Assistance</a></li> <li> <p class="help"> <a class="a11y-main-link" href="https://status.arxiv.org" target="_blank">arXiv Operational Status <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 512" class="icon filter-dark_grey" role="presentation"><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"/></svg></a><br> Get status notifications via <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/email/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg>email</a> or <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/slack/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" class="icon filter-black" role="presentation"><path d="M94.12 315.1c0 25.9-21.16 47.06-47.06 47.06S0 341 0 315.1c0-25.9 21.16-47.06 47.06-47.06h47.06v47.06zm23.72 0c0-25.9 21.16-47.06 47.06-47.06s47.06 21.16 47.06 47.06v117.84c0 25.9-21.16 47.06-47.06 47.06s-47.06-21.16-47.06-47.06V315.1zm47.06-188.98c-25.9 0-47.06-21.16-47.06-47.06S139 32 164.9 32s47.06 21.16 47.06 47.06v47.06H164.9zm0 23.72c25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06H47.06C21.16 243.96 0 222.8 0 196.9s21.16-47.06 47.06-47.06H164.9zm188.98 47.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06h-47.06V196.9zm-23.72 0c0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06V79.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06V196.9zM283.1 385.88c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06v-47.06h47.06zm0-23.72c-25.9 0-47.06-21.16-47.06-47.06 0-25.9 21.16-47.06 47.06-47.06h117.84c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06H283.1z"/></svg>slack</a> </p> </li> </ul> </div> </div> </div>  </div> </footer> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/member_acknowledgement.js"></script> </body> </html>

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