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<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/2411.04314">arXiv:2411.04314</a> <span> [<a href="https://arxiv.org/pdf/2411.04314">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Frequency-doubled chirped-pulse dual-comb generation in the near-UV: Combined vs separated beam investigations of Rb atoms near 420 nm </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Stroud%2C+J+R">Jasper R. Stroud</a>, <a href="/search/physics?searchtype=author&query=Plusquellic%2C+D+F">David F. Plusquellic</a> </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="2411.04314v1-abstract-short" style="display: inline;"> We describe an electro-optic dual-comb system that operates in the near-infrared (near-IR) region to generate optical frequency combs in the near-UV by sum frequency generation in two configurations. The near-IR frequency combs are generated using chirped pulses that down convert the optical information into the radio frequency (RF) domain by a difference in the chirp bandwidths. Near (UV) combs a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.04314v1-abstract-full').style.display = 'inline'; document.getElementById('2411.04314v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.04314v1-abstract-full" style="display: none;"> We describe an electro-optic dual-comb system that operates in the near-infrared (near-IR) region to generate optical frequency combs in the near-UV by sum frequency generation in two configurations. The near-IR frequency combs are generated using chirped pulses that down convert the optical information into the radio frequency (RF) domain by a difference in the chirp bandwidths. Near (UV) combs at twice the near-IR bandwidth are obtained by sum frequency generation in a nonlinear crystal and detected by a hybrid photon counting detection system. We compare the results of studies of Rb near 420 nm using two optical arrangements where the near-IR combs are mixed in the crystal as combined or as separated beams. While the latter method enables phase retrievals, the combined beam method is superior for phase stability, power throughput for detection, and ease of alignment. High order interleaving enables near-UV bandwidths near 4 cm-1 for faint photonic sensing and spectroscopic applications. The harmonic generation method is easily extendable across much of the titanium sapphire tuning range. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.04314v1-abstract-full').style.display = 'none'; document.getElementById('2411.04314v1-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> 6 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2306.17809">arXiv:2306.17809</a> <span> [<a href="https://arxiv.org/pdf/2306.17809">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</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/10.1063/5.0165582">10.1063/5.0165582 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High accuracy, high dynamic range optomechanical accelerometry enabled by dual comb spectroscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Long%2C+D+A">D. A. Long</a>, <a href="/search/physics?searchtype=author&query=Stroud%2C+J+R">J. R. Stroud</a>, <a href="/search/physics?searchtype=author&query=Reschovsky%2C+B+J">B. J. Reschovsky</a>, <a href="/search/physics?searchtype=author&query=Bao%2C+Y">Y. Bao</a>, <a href="/search/physics?searchtype=author&query=Zhou%2C+F">F. Zhou</a>, <a href="/search/physics?searchtype=author&query=Bresler%2C+S+M">S. M. Bresler</a>, <a href="/search/physics?searchtype=author&query=LeBrun%2C+T+W">T. W. LeBrun</a>, <a href="/search/physics?searchtype=author&query=Plusquellic%2C+D+F">D. F. Plusquellic</a>, <a href="/search/physics?searchtype=author&query=Gorman%2C+J+J">J. J. Gorman</a> </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="2306.17809v2-abstract-short" style="display: inline;"> Cavity optomechanical sensors can offer exceptional sensitivity; however, interrogating the cavity motion with high accuracy and dynamic range has proven to be challenging. Here we employ a dual optical frequency comb spectrometer to readout a microfabricated cavity optomechanical accelerometer, allowing for rapid simultaneous measurements of the cavity's displacement, finesse, and coupling at acc… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.17809v2-abstract-full').style.display = 'inline'; document.getElementById('2306.17809v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.17809v2-abstract-full" style="display: none;"> Cavity optomechanical sensors can offer exceptional sensitivity; however, interrogating the cavity motion with high accuracy and dynamic range has proven to be challenging. Here we employ a dual optical frequency comb spectrometer to readout a microfabricated cavity optomechanical accelerometer, allowing for rapid simultaneous measurements of the cavity's displacement, finesse, and coupling at accelerations up to 24 g (236 m/s$^2$). With this approach, we have achieved a displacement sensitivity of 3 fm/Hz$^{1/2}$, a measurement rate of 100 kHz, and a dynamic range of 3.9 $\times$ 10$^5$ which is the highest we are aware of for a microfabricated cavity optomechanical sensor. In addition, comparisons of our optomechanical sensor coupled directly to a commercial reference accelerometer show agreement at the 0.5% level, a value which is limited by the reference's reported uncertainty. Further, the methods described herein are not limited to accelerometry but rather can be readily applied to nearly any optomechanical sensor where the combination of high speed, dynamic range, and sensitivity is expected to be enabling. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.17809v2-abstract-full').style.display = 'none'; document.getElementById('2306.17809v2-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 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2023. </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">11 pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> APL Photonics 8, 091302 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2205.01219">arXiv:2205.01219</a> <span> [<a href="https://arxiv.org/pdf/2205.01219">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</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/10.1364/OL.465823">10.1364/OL.465823 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A dual chirped-pulse electro-optical frequency comb method for simultaneous molecular spectroscopy and dynamics studies: Formic acid in the THz region </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Stroud%2C+J+R">Jasper R. Stroud</a>, <a href="/search/physics?searchtype=author&query=Plusquellic%2C+D+F">David F. Plusquellic</a> </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="2205.01219v2-abstract-short" style="display: inline;"> An electro-optic dual comb system based on chirped-pulse waveforms is used to simultaneously acquire temporally magnified rapid passage signals and normal spectral line shapes from the back-transformation to the time domain. Multi-heterodyne THz wave generation and detection is performed with the difference frequency mixing of two free-running lasers. The method is used to obtain THz spectra of fo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.01219v2-abstract-full').style.display = 'inline'; document.getElementById('2205.01219v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2205.01219v2-abstract-full" style="display: none;"> An electro-optic dual comb system based on chirped-pulse waveforms is used to simultaneously acquire temporally magnified rapid passage signals and normal spectral line shapes from the back-transformation to the time domain. Multi-heterodyne THz wave generation and detection is performed with the difference frequency mixing of two free-running lasers. The method is used to obtain THz spectra of formic acid in the 10 cm-1 to 20 cm-1 (300 GHz to 600 GHz) region over a range of pressures. The method is widely applicable across other spectral regions for investigations of the transient dynamics and spectroscopy of molecular systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.01219v2-abstract-full').style.display = 'none'; document.getElementById('2205.01219v2-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> 8 June, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2022. </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">4 pages, 4 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/2203.16509">arXiv:2203.16509</a> <span> [<a href="https://arxiv.org/pdf/2203.16509">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</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"> High dynamic range electro-optic dual-comb interrogation of optomechanical sensors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Long%2C+D+A">D. A. Long</a>, <a href="/search/physics?searchtype=author&query=Reschovsky%2C+B+J">B. J. Reschovsky</a>, <a href="/search/physics?searchtype=author&query=LeBrun%2C+T+W">T. W. LeBrun</a>, <a href="/search/physics?searchtype=author&query=Gorman%2C+J+J">J. J. Gorman</a>, <a href="/search/physics?searchtype=author&query=Hodges%2C+J+T">J. T. Hodges</a>, <a href="/search/physics?searchtype=author&query=Plusquellic%2C+D+F">D. F. Plusquellic</a>, <a href="/search/physics?searchtype=author&query=Stroud%2C+J+R">J. R. Stroud</a> </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="2203.16509v1-abstract-short" style="display: inline;"> An interleaved, chirped electro-optic dual comb system is demonstrated for rapid, high dynamic range measurements of cavity optomechanical sensors. This approach allows for the cavity displacements to be interrogated at measurement times as fast as 10 渭s over ranges far larger than can be achieved with alternative methods. While the performance of this novel readout approach is evaluated with an o… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.16509v1-abstract-full').style.display = 'inline'; document.getElementById('2203.16509v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.16509v1-abstract-full" style="display: none;"> An interleaved, chirped electro-optic dual comb system is demonstrated for rapid, high dynamic range measurements of cavity optomechanical sensors. This approach allows for the cavity displacements to be interrogated at measurement times as fast as 10 渭s over ranges far larger than can be achieved with alternative methods. While the performance of this novel readout approach is evaluated with an optomechanical accelerometer, this method is applicable to a wide range of applications including temperature, pressure, and humidity sensing as well as acoustics and molecular spectroscopy. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.16509v1-abstract-full').style.display = 'none'; document.getElementById('2203.16509v1-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> 30 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </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">4 pages, 9 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/2109.13469">arXiv:2109.13469</a> <span> [<a href="https://arxiv.org/pdf/2109.13469">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</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/10.1063/5.0076506">10.1063/5.0076506 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Difference-Frequency Chirped-Pulse Dual-comb Generation in the THz Region: Temporal Magnification of the Quantum Dynamics of Water Vapor Lines by >60,000 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Stroud%2C+J+R">Jasper R. Stroud</a>, <a href="/search/physics?searchtype=author&query=Plusquellic%2C+D+F">David F. Plusquellic</a> </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="2109.13469v1-abstract-short" style="display: inline;"> A new difference-frequency method based on electro-optic phase modulators and two free-running lasers is reported to perform THz dual-comb spectroscopy. </span> <span class="abstract-full has-text-grey-dark mathjax" id="2109.13469v1-abstract-full" style="display: none;"> A new difference-frequency method based on electro-optic phase modulators and two free-running lasers is reported to perform THz dual-comb spectroscopy. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.13469v1-abstract-full').style.display = 'none'; document.getElementById('2109.13469v1-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> 27 September, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2106.11414">arXiv:2106.11414</a> <span> [<a href="https://arxiv.org/pdf/2106.11414">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</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/10.1364/OE.434482">10.1364/OE.434482 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Interleaved Electro-Optic Dual Comb Generation to Expand Bandwidth and Scan Rate for Molecular Spectroscopy and Dynamics Studies near 1.6 渭m </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Stroud%2C+J+R">Jasper R. Stroud</a>, <a href="/search/physics?searchtype=author&query=Simon%2C+J+B">James B. Simon</a>, <a href="/search/physics?searchtype=author&query=Wagner%2C+G+A">Gerd A. Wagner</a>, <a href="/search/physics?searchtype=author&query=Plusquellic%2C+D+F">David F. Plusquellic</a> </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="2106.11414v1-abstract-short" style="display: inline;"> A chirped-pulse interleaving method is reported for generation of dual optical frequency combs based on electro-optic phase modulators (EOM) in a free-running all-fiber based system. Methods are discussed to easily modify the linear chirp rate and comb resolution by more than three orders of magnitude and to significantly increase the spectral bandwidth coverage. The agility of the technique is sh… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.11414v1-abstract-full').style.display = 'inline'; document.getElementById('2106.11414v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2106.11414v1-abstract-full" style="display: none;"> A chirped-pulse interleaving method is reported for generation of dual optical frequency combs based on electro-optic phase modulators (EOM) in a free-running all-fiber based system. Methods are discussed to easily modify the linear chirp rate and comb resolution by more than three orders of magnitude and to significantly increase the spectral bandwidth coverage. The agility of the technique is shown to both capture complex line shapes and to magnify rapid passage effects in spectroscopic and molecular dynamics studies of CO2. These methods are well-suited for applications in the areas of remote sensing, reaction dynamics, and sub-Doppler studies across the wide spectral regions accessible to EOMs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.11414v1-abstract-full').style.display = 'none'; document.getElementById('2106.11414v1-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, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1404.3251">arXiv:1404.3251</a> <span> [<a href="https://arxiv.org/pdf/1404.3251">pdf</a>, <a href="https://arxiv.org/format/1404.3251">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="Nuclear Experiment">nucl-ex</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/10.1088/1748-0221/9/07/P07029">10.1088/1748-0221/9/07/P07029 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Design and operation of a cryogenic charge-integrating preamplifier for the MuSun experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ryan%2C+R+A">R. A. Ryan</a>, <a href="/search/physics?searchtype=author&query=Wauters%2C+F">F. Wauters</a>, <a href="/search/physics?searchtype=author&query=Gray%2C+F+E">F. E. Gray</a>, <a href="/search/physics?searchtype=author&query=Kammel%2C+P">P. Kammel</a>, <a href="/search/physics?searchtype=author&query=Nadtochy%2C+A">A. Nadtochy</a>, <a href="/search/physics?searchtype=author&query=Peterson%2C+D">D. Peterson</a>, <a href="/search/physics?searchtype=author&query=van+Wechel%2C+T">T. van Wechel</a>, <a href="/search/physics?searchtype=author&query=Gross%2C+E">E. Gross</a>, <a href="/search/physics?searchtype=author&query=Gubanich%2C+M">M. Gubanich</a>, <a href="/search/physics?searchtype=author&query=Kochenda%2C+L">L. Kochenda</a>, <a href="/search/physics?searchtype=author&query=Kravtsov%2C+P">P. Kravtsov</a>, <a href="/search/physics?searchtype=author&query=Murray%2C+M+H">M. H. Murray</a>, <a href="/search/physics?searchtype=author&query=Orozco%2C+D">D. Orozco</a>, <a href="/search/physics?searchtype=author&query=Osofsky%2C+R">R. Osofsky</a>, <a href="/search/physics?searchtype=author&query=Petrov%2C+G+E">G. E. Petrov</a>, <a href="/search/physics?searchtype=author&query=Phillips%2C+J+D">J. D. Phillips</a>, <a href="/search/physics?searchtype=author&query=Stroud%2C+J">J. Stroud</a>, <a href="/search/physics?searchtype=author&query=Trofimov%2C+V">V. Trofimov</a>, <a href="/search/physics?searchtype=author&query=Vasilyev%2C+A">A. Vasilyev</a>, <a href="/search/physics?searchtype=author&query=Vznuzdaev%2C+M">M. Vznuzdaev</a> </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="1404.3251v2-abstract-short" style="display: inline;"> The central detector in the MuSun experiment is a pad-plane time projection ionization chamber that operates without gas amplification in deuterium at 31 K; it is used to measure the rate of the muon capture process $渭^- + d \rightarrow n + n + 谓_渭$. A new charge-sensitive preamplifier, operated at 140 K, has been developed for this detector. It achieved a resolution of 4.5 keV(D$_2$) or 120… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1404.3251v2-abstract-full').style.display = 'inline'; document.getElementById('1404.3251v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1404.3251v2-abstract-full" style="display: none;"> The central detector in the MuSun experiment is a pad-plane time projection ionization chamber that operates without gas amplification in deuterium at 31 K; it is used to measure the rate of the muon capture process $渭^- + d \rightarrow n + n + 谓_渭$. A new charge-sensitive preamplifier, operated at 140 K, has been developed for this detector. It achieved a resolution of 4.5 keV(D$_2$) or 120 $e^-$ RMS with zero detector capacitance at 1.1 $渭$s integration time in laboratory tests. In the experimental environment, the electronic resolution is 10 keV(D$_2$) or 250 $e^-$ RMS at a 0.5 $渭$s integration time. The excellent energy resolution of this amplifier has enabled discrimination between signals from muon-catalyzed fusion and muon capture on chemical impurities, which will precisely determine systematic corrections due to these processes. It is also expected to improve the muon tracking and determination of the stopping location. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1404.3251v2-abstract-full').style.display = 'none'; document.getElementById('1404.3251v2-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 May, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 April, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2014. </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">18 pages + title page, 13 figures, to be submitted to JINST; minor corrections, added one reference, updated author list</span> </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: 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