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The resulting risk of particle contamination was difficult to assess, and could not be excluded with certainty. If one or more cavities were contaminated, a severe impact on beam operations in the LHC machine was to be expected. In order to minimize the risks, the Asia cryomodule has been replaced with a spare unit. Subsequently, the cryomodule was tested in the SM18 test facility without intermediate venting, and showed high levels of radiation due to field emission above 1.8 MV in one of the cavities. The other cavities were less strongly affected, but clear signs of contamination were observed. The helium processing technique was used to improve the performance of the SRF cavity with respect to field emission. This paper will discuss the results of the above-mentioned test. Turaj, Katarzyna; Brunner, Olivier; Butterworth, Andrew; Gerigk, Frank; Maesen, Pierre; Montesinos, Eric; Peauger, Franck; Therasse, Mathieu; Venturini Delsolaro, Walter" /> <meta name="keywords" content="cavity, cryomodule, vacuum, radiation, operation" /> <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 : Degradation and Recovery of the LHC RF Cryomodule Performance Using the Helium Processing Technique" name="citation_title" /> <meta content="Turaj, Katarzyna" name="citation_author" /> <meta content="Montesinos, Eric" name="citation_author" /> <meta content="Venturini Delsolaro, Walter" name="citation_author" /> <meta content="Therasse, Mathieu" name="citation_author" /> <meta content="Brunner, Olivier" name="citation_author" /> <meta content="Butterworth, Andrew" name="citation_author" /> <meta content="Peauger, Franck" name="citation_author" /> <meta content="Gerigk, Frank" name="citation_author" /> <meta content="Maesen, Pierre" name="citation_author" /> <meta content="10.18429/JACoW-SRF2021-THPFAV006" name="citation_doi" /> <meta content="JACoW SRF" name="citation_journal_title" /> <meta content="2021" name="citation_volume" /> <meta content="746-750" name="citation_firstpage" /> <meta content="2022" name="citation_publication_date" /> <meta name="citation_online_date" content="2023/01/14"> <meta content="10.18429/JACoW-SRF2021-THPFAV006" name="citation_doi" /> <meta name="citation_pdf_url" content="https://cds.cern.ch/record/2846167/files/document.pdf" />  <meta content="Degradation and Recovery of the LHC RF Cryomodule Performance Using the Helium Processing Technique" 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/2846167" property="og:url" /> <meta content="CERN Document Server" property="og:site_name" /> <meta content="JACOW" property="og:description" /> <meta content="The LHC RF cryomodule &quot;Asia&quot; suffered an accidental influx of about 0.5 l of tunnel air during the leak checks of the pumping manifolds. The resulting risk of particle contamination was difficult to assess, and could not be excluded with certainty. If one or more cavities were contaminated, a severe impact on beam operations in the LHC machine was to be expected. In order to minimize the risks, the Asia cryomodule has been replaced with a spare unit. Subsequently, the cryomodule was tested in the SM18 test facility without intermediate venting, and showed high levels of radiation due to field emission above 1.8 MV in one of the cavities. The other cavities were less strongly affected, but clear signs of contamination were observed. The helium processing technique was used to improve the performance of the SRF cavity with respect to field emission. This paper will discuss the results of the above-mentioned test." property="og:description" />  <meta content="summary" name="twitter:card" /> <meta content="summary" name="twitter:card" /> <style></style> </head> <body class="CERN32Document32Server search" lang="ja">  <div id="cern-toolbar"> <h1><a href="http://cern.ch" title="CERN">CERN <span>Accelerating science</span></a></h1> <ul> <li class="cern-accountlinks"><a class="cern-account" href="https://cds.cern.ch/youraccount/login?ln=ja&referer=https%3A//cds.cern.ch/record/2846167%3Fln%3Dja" title="Sign in to your CERN account">Sign in</a></li> <li><a class="cern-directory" href="http://cern.ch/directory" title="Search CERN resources and browse the directory">Directory</a></li> </ul> </div>   <div role="banner" class="clearfix" id="header"> <div class="header-inner inner"> <hgroup class="clearfix"> <h2 id="site-name"> <a rel="home" title="Home" href="/"><span>CERN Document Server</span></a> </h2> <h3 id="site-slogan">Access articles, reports and multimedia content in HEP</h3> </hgroup> <div role="navigation" id="main-navigation" class="cdsmenu"> <h2 class="element-invisible">Main menu</h2><ul class="links inline clearfix"> <li class="menu-386 first active-trail"><a class="active-trail" href="https://cds.cern.ch/?ln=ja">検索</a></li> <li class="menu-444 "><a class="" title="" href="https://cds.cern.ch/submit?ln=ja">アップロード</a></li> <li class="menu-426 "><a class="" href="https://cds.cern.ch/help/?ln=ja">ヘルプ</a></li> <li class="leaf hassubcdsmenu"> <a hreflang="en" class="header" href="https://cds.cern.ch/youraccount/display?ln=ja">あなたのページ</a> <ul class="subsubcdsmenu"><li><a href="https://cds.cern.ch/youralerts/list?ln=ja">Your alerts</a></li><li><a href="https://cds.cern.ch/yourbaskets/display?ln=ja">Your baskets</a></li><li><a href="https://cds.cern.ch/yourcomments?ln=ja">Your comments</a></li><li><a href="https://cds.cern.ch/youralerts/display?ln=ja">Your searches</a></li></ul></li> </ul> </div> </div> </div>  <table class="navtrailbox"> <tr> <td class="navtrailboxbody"> <a href="/?ln=ja" class="navtrail">ホーム</a> > Degradation and Recovery of the LHC RF Cryomodule Performance Using the Helium Processing Technique </td> </tr> </table> </div> <div class="pagebody"><div class="pagebodystripemiddle"> <div class="detailedrecordbox"> <div class="detailedrecordtabs"> <div> <ul class="detailedrecordtabs"><li class="on first"><a href="/record/2846167/?ln=ja">Information </a></li><li class=""><a href="/record/2846167/files?ln=ja">Files </a></li></ul> <div id="tabsSpacer" style="clear:both;height:0px"> </div></div> </div> <div class="detailedrecordboxcontent"> <div class="top-left-folded"></div> <div class="top-right-folded"></div> <div class="inside">  <abbr class="unapi-id" title="2846167"></abbr> <style type="text/css">  </style> <table class="formatRecordTableFullWidth" > <tr> <td class="formatRecordHeader" style="background-image: url('https://cds.cern.ch/img/journals.jpg');" colspan="2">  Article </td> </tr> <script type="text/javascript"> $( document ).ready(function() { $('.showAuthor').on('click', function() { var author = '<p>' + $(this).data('name') + '</p>'; 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>Degradation and Recovery of the LHC RF Cryomodule Performance Using the Helium Processing Technique</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=Turaj%2C%20Katarzyna&ln=ja">Turaj, Katarzyna</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Brunner%2C%20Olivier&ln=ja">Brunner, Olivier</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Butterworth%2C%20Andrew&ln=ja">Butterworth, Andrew</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Gerigk%2C%20Frank&ln=ja">Gerigk, Frank</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Maesen%2C%20Pierre&ln=ja">Maesen, Pierre</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Montesinos%2C%20Eric&ln=ja">Montesinos, Eric</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Peauger%2C%20Franck&ln=ja">Peauger, Franck</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Therasse%2C%20Mathieu&ln=ja">Therasse, Mathieu</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Venturini%20Delsolaro%2C%20Walter&ln=ja">Venturini Delsolaro, Walter</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-SRF2021-THPFAV006"><i>JACoW SRF</i> 2021 (2022) 746-750</a> </a></td></tr> <tr><td class="formatRecordLabel"> In: </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/record/2839869">20th International Conference on RF Superconductivity (SRF 2021)</a>, Online, US, 28 Jun - 2 Jul 2021, pp.746-750</td></tr> <tr><td class="formatRecordLabel"> DOI </td><td style="padding-left:5px;"><a href="http://dx.doi.org/10.18429/JACoW-SRF2021-THPFAV006" title="DOI" target="_blank">10.18429/JACoW-SRF2021-THPFAV006</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%20LHC&f=693__a">CERN LHC</a></td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">The LHC RF cryomodule "Asia" suffered an accidental influx of about 0.5 l of tunnel air during the leak checks of the pumping manifolds. The resulting risk of particle contamination was difficult to assess, and could not be excluded with certainty. If one or more cavities were contaminated, a severe impact on beam operations in the LHC machine was to be expected. In order to minimize the risks, the Asia cryomodule has been replaced with a spare unit. Subsequently, the cryomodule was tested in the SM18 test facility without intermediate venting, and showed high levels of radiation due to field emission above 1.8 MV in one of the cavities. The other cavities were less strongly affected, but clear signs of contamination were observed. The helium processing technique was used to improve the performance of the SRF cavity with respect to field emission. This paper will discuss the results of the above-mentioned test.</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/2173931">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"> レコード　生成： 2023-01-14, 最終変更： 2023-01-14</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=ja&p=recid%3A2846167&rm=wrd" class="moreinfo">ほとんど同じレコード</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">フルテキスト:</small> <br /><a href="/record/2846167/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=ja&recid=2846167">Add to personal basket</a></li> <li>Export as <a style="text-decoration:underline;font-weight:normal" href="/record/2846167/export/hx?ln=ja">BibTeX</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2846167/export/hm?ln=ja">MARC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2846167/export/xm?ln=ja">MARCXML</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2846167/export/xd?ln=ja">DC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2846167/export/xe?ln=ja">EndNote</a>,  <a style="text-decoration:underline;font-weight:normal" href="/record/2846167/export/xn?ln=ja">NLM</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2846167/export/xw?ln=ja">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:2846167/add'); $('#bookmark_sciencewise').bookmark({sites: ['sciencewise']}); $('#bookmark').bookmark({ sites: ['facebook', 'twitter', 'linkedin', 'google_plusone'], icons: '/img/bookmarks.png', url: 'https://cds.cern.ch/record/2846167', addEmail: true, title: "Degradation and Recovery of the LHC RF Cryomodule Performance Using the Helium Processing Technique", description: "The LHC RF cryomodule \"Asia\" suffered an accidental influx of about 0.5 l of tunnel air during the leak checks of the pumping manifolds. The resulting risk of particle contamination was difficult to assess, and could not be excluded with certainty. If one or more cavities were contaminated, a severe impact on beam operations in the LHC machine was to be expected. In order to minimize the risks, the Asia cryomodule has been replaced with a spare unit. Subsequently, the cryomodule was tested in the SM18 test facility without intermediate venting, and showed high levels of radiation due to field emission above 1.8 MV in one of the cavities. The other cavities were less strongly affected, but clear signs of contamination were observed. The helium processing technique was used to improve the performance of the SRF cavity with respect to field emission. 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