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The light of a pulsed laser is trans- ported through optical fibers and focused into the 160 MeV/c $H^{-}$ beam. The interaction of this laser “wire” with the $H^{-}$ ions detaches electrons that are collected by an electron- multiplier, while the resulting $H^0$ particles, after being separated from the main $H^{-}$ beam by a dipole magnet, are recorded by a diamond strip detector, located a few meters away from the interaction point. The transverse beam emittance and profile are reconstructed from the laser by a stepped scan through the $H^{-}$ beam. After several years of feasibility tests and prototyping, this paper presents the details about the final hardware implementation, operational aspects, and the 2022 experimental results. Goldblatt, Aurélie; Andreassen, Odd; Boorman, Gary; Bosco, Alessio; Gibson, Stephen; Hofmann, Thomas; Roncarolo, Federico; Tagg, Joseph" /> <meta name="keywords" content="laser, emittance, linac, detector, electron" /> <script type="text/javascript" src="https://cds.cern.ch/js/jquery.min.js"></script>  <link rel="stylesheet" href="https://cds.cern.ch/img/webnews.css" type="text/css" />  <script type="text/javascript" src="https://cds.cern.ch/js/webnews.js?v=20131009"></script> <meta property="fb:app_id" content="137353533001720"/> <script type="text/x-mathjax-config"> MathJax.Hub.Config({ tex2jax: {inlineMath: [['$','$']], processEscapes: true}, showProcessingMessages: false, messageStyle: "none" }); </script> <script src="/MathJax/MathJax.js?config=TeX-AMS_CHTML" type="text/javascript"> </script>  <meta content="JACOW : LINAC4 Laser Profile and Emittance Meter Commissioning" name="citation_title" /> <meta content="Goldblatt, Aurélie" name="citation_author" /> <meta content="Bosco, Alessio" name="citation_author" /> <meta content="Gibson, Stephen" name="citation_author" /> <meta content="Roncarolo, Federico" name="citation_author" /> <meta content="Boorman, Gary" name="citation_author" /> <meta content="Andreassen, Odd" name="citation_author" /> <meta content="Tagg, Joseph" name="citation_author" /> <meta content="Hofmann, Thomas" name="citation_author" /> <meta content="10.18429/JACoW-IBIC2022-TU3C3" name="citation_doi" /> <meta content="JACoW IBIC" name="citation_journal_title" /> <meta content="2022" name="citation_volume" /> <meta content="357-361" name="citation_firstpage" /> <meta content="2022" name="citation_publication_date" /> <meta name="citation_online_date" content="2023/03/16"> <meta content="10.18429/JACoW-IBIC2022-TU3C3" name="citation_doi" /> <meta name="citation_pdf_url" content="https://cds.cern.ch/record/2852578/files/document.pdf" />  <meta content="LINAC4 Laser Profile and Emittance Meter Commissioning" property="og:title" /> <meta content="JACOW" property="og:title" /> <meta content="website" property="og:type" /> <meta content="website" property="og:type" /> <meta content="https://cds.cern.ch/record/2852578" property="og:url" /> <meta content="CERN Document Server" property="og:site_name" /> <meta content="JACOW" property="og:description" /> <meta content="The CERN LINAC4 is now equipped with two laser profile and emittance meters, a basically non destructive measurement of the transverse beam profile, not limited by the beam power density. The light of a pulsed laser is trans- ported through optical fibers and focused into the 160 MeV/c $H^{-}$ beam. The interaction of this laser “wire” with the $H^{-}$ ions detaches electrons that are collected by an electron- multiplier, while the resulting $H^0$ particles, after being separated from the main $H^{-}$ beam by a dipole magnet, are recorded by a diamond strip detector, located a few meters away from the interaction point. The transverse beam emittance and profile are reconstructed from the laser by a stepped scan through the $H^{-}$ beam. 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var affiliation = $(this).data('affiliation') + '</br>'; var contribution = $(this).data('contribution') + '</br>'; $.magnificPopup.open({ items: { src: '<div id="ovelary-mathjax" class="overlay-white oc-content overlay-white-500">' + author + affiliation + contribution + '</div>', type: 'inline' }, callbacks: { open: function() { var div = document.getElementById("overlay-mathjax") MathJax.Hub.Queue(["Typeset", MathJax.Hub, div]); }, } }) }) }); </script> <tr><td class="formatRecordLabel"> Title </td><td style="padding-left:5px;"><b>LINAC4 Laser Profile and Emittance Meter Commissioning</b></td></tr> <tr><td class="formatRecordLabel"><span style="white-space:nowrap;"> Author(s) </span> </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/search?f=author&p=Goldblatt%2C%20Aur%C3%A9lie&ln=en">Goldblatt, Aurélie</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Andreassen%2C%20Odd&ln=en">Andreassen, Odd</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Boorman%2C%20Gary&ln=en">Boorman, Gary</a> (JAI, UK) ; <a href="https://cds.cern.ch/search?f=author&p=Bosco%2C%20Alessio&ln=en">Bosco, Alessio</a> (JAI, UK) ; <a href="https://cds.cern.ch/search?f=author&p=Gibson%2C%20Stephen&ln=en">Gibson, Stephen</a> (JAI, UK) ; <a href="https://cds.cern.ch/search?f=author&p=Hofmann%2C%20Thomas&ln=en">Hofmann, Thomas</a> (Unlisted, CH) ; <a href="https://cds.cern.ch/search?f=author&p=Roncarolo%2C%20Federico&ln=en">Roncarolo, Federico</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Tagg%2C%20Joseph&ln=en">Tagg, Joseph</a> (CERN)</td></tr> <tr><td class="formatRecordLabel"> Publication </td><td style="padding-left:5px;">2022</td></tr> <tr><td class="formatRecordLabel"> Number of pages </td><td style="padding-left:5px;">5</td></tr> <tr><td class="formatRecordLabel"> In: </td><td style="padding-left:5px;"><a href="http://dx.doi.org/10.18429/JACoW-IBIC2022-TU3C3"><i>JACoW IBIC</i> 2022 (2022) 357-361</a> </a></td></tr> <tr><td class="formatRecordLabel"> In: </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/record/2827585">11th International Beam Instrumentation Conference (IBIC 2022)</a>, Cracow, Poland, 11 - 15 Sep 2022, pp.357-361</td></tr> <tr><td class="formatRecordLabel"> DOI </td><td style="padding-left:5px;"><a href="http://dx.doi.org/10.18429/JACoW-IBIC2022-TU3C3" title="DOI" target="_blank">10.18429/JACoW-IBIC2022-TU3C3</a> <tr><td class="formatRecordLabel"> Subject category </td><td style="padding-left:5px;">Accelerators and Storage Rings</td></tr> <tr><td class="formatRecordLabel"> Accelerator/Facility, Experiment </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/search?p=CERN%20LINAC4&f=693__a">CERN LINAC4</a></td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">The CERN LINAC4 is now equipped with two laser profile and emittance meters, a basically non destructive measurement of the transverse beam profile, not limited by the beam power density. The light of a pulsed laser is trans- ported through optical fibers and focused into the 160 MeV/c $H^{-}$ beam. The interaction of this laser “wire” with the $H^{-}$ ions detaches electrons that are collected by an electron- multiplier, while the resulting $H^0$ particles, after being separated from the main $H^{-}$ beam by a dipole magnet, are recorded by a diamond strip detector, located a few meters away from the interaction point. The transverse beam emittance and profile are reconstructed from the laser by a stepped scan through the $H^{-}$ beam. After several years of feasibility tests and prototyping, this paper presents the details about the final hardware implementation, operational aspects, and the 2022 experimental results.</td></tr> <tr><td class="formatRecordLabel"> Copyright/License </td><td style="padding-left:5px;">publication: (License: <a href="https://creativecommons.org/licenses/by/4.0">CC-BY-4.0</a>)</td></tr> </table> <br/>Corresponding record in: <a href="http://inspirehep.net/record/2616771">Inspire</a> <small> </small> <br/> <br/><br/><div align="right"><div style="padding-bottom:2px;padding-top:30px;"><span class="moreinfo" style="margin-right:10px;"> <a href="" class="moreinfo">Back to search</a> </span></div></div> <div class="bottom-left-folded"><div class="recordlastmodifiedbox" style="position:relative;margin-left:1px"> Record created 2023-03-16, last modified 2023-03-16</div></div> <div class="bottom-right-folded" style="text-align:right;padding-bottom:2px;"> <span class="moreinfo" style="margin-right:10px;"><a href="/search?ln=en&p=recid%3A2852578&rm=wrd" class="moreinfo">Similar records</a></span></div> </div> </div> </div> <br/> <br /> <div class="detailedrecordminipanel"> <div class="top-left"></div><div class="top-right"></div> <div class="inside"> <div id="detailedrecordminipanelfile" style="width:33%;float:left;text-align:center;margin-top:0"> <div><small class="detailedRecordActions">Fulltext:</small> <br /><a href="/record/2852578/files/document.pdf"><img style="border:none" src="/img/file-icon-text-34x48.gif" alt="Download fulltext" /><br />PDF</a><br /></div> </div> <div id="detailedrecordminipanelreview" style="width:30%;float:left;text-align:center"> </div> <div id="detailedrecordminipanelactions" style="width:36%;float:right;text-align:right;"> <ul class="detailedrecordactions"> <li><a href="/yourbaskets/add?ln=en&recid=2852578">Add to personal basket</a></li> <li>Export as <a style="text-decoration:underline;font-weight:normal" href="/record/2852578/export/hx?ln=en">BibTeX</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2852578/export/hm?ln=en">MARC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2852578/export/xm?ln=en">MARCXML</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2852578/export/xd?ln=en">DC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2852578/export/xe?ln=en">EndNote</a>,  <a style="text-decoration:underline;font-weight:normal" href="/record/2852578/export/xn?ln=en">NLM</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2852578/export/xw?ln=en">RefWorks</a> </li> </ul> <div style='padding-left: 13px;'>  <div id="bookmark"></div> <div id="bookmark_sciencewise"></div> <style type="text/css"> #bookmark_sciencewise, #bookmark {float: left;} #bookmark_sciencewise li {padding: 2px; width: 25px;} #bookmark_sciencewise ul, #bookmark ul {list-style-image: none;} </style> <script type="text/javascript" src="/js/jquery.bookmark.min.js"></script> <style type="text/css">@import "/css/jquery.bookmark.css";</style> <script type="text/javascript">// <![CDATA[ $.bookmark.addSite('sciencewise', 'ScienceWise.info', 'https://cds.cern.ch/img/sciencewise.png', 'en', 'bookmark', 'http://sciencewise.info/bookmarks/cds:2852578/add'); $('#bookmark_sciencewise').bookmark({sites: ['sciencewise']}); $('#bookmark').bookmark({ sites: ['facebook', 'twitter', 'linkedin', 'google_plusone'], icons: '/img/bookmarks.png', url: 'https://cds.cern.ch/record/2852578', addEmail: true, title: "LINAC4 Laser Profile and Emittance Meter Commissioning", description: "The CERN LINAC4 is now equipped with two laser profile and emittance meters, a basically non destructive measurement of the transverse beam profile, not limited by the beam power density. The light of a pulsed laser is trans- ported through optical fibers and focused into the 160 MeV/c $H^{-}$ beam. The interaction of this laser \u201cwire\u201d with the $H^{-}$ ions detaches electrons that are collected by an electron- multiplier, while the resulting $H^0$ particles, after being separated from the main $H^{-}$ beam by a dipole magnet, are recorded by a diamond strip detector, located a few meters away from the interaction point. The transverse beam emittance and profile are reconstructed from the laser by a stepped scan through the $H^{-}$ beam. 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