CINXE.COM

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">     <html xmlns="http://www.w3.org/1999/xhtml" lang="ka" xml:lang="ka" xmlns:og="http://ogp.me/ns#" xmlns:fb="http://ogp.me/ns/fb#"> <head> <title>A vacuum chamber for operation of a GEM-based detector in sealed-mode and at low pressure for LET measurements - CERN Document Server</title> <link href='https://framework.web.cern.ch/framework/2.0/fonts/PTSansWeb/PTSansWeb.css' rel='stylesheet' type='text/css' /> <link rel="stylesheet" href="http://cds.cern.ch/img/invenio.css?v=20141127" type="text/css" /> <link rel="stylesheet" href="http://cds.cern.ch/img/cern_theme/css/cern_theme.css?v=20141127" type="text/css" /> <link rel="stylesheet"href="/css/font-awesome.min.css"> <meta http-equiv="X-UA-Compatible" content="IE=Edge"/> <link rel="stylesheet" href="http://cds.cern.ch/img/cern_toolbar/css/toolbar.css" type="text/css" />    <link rel="canonical" href="http://cds.cern.ch/record/2835876" /> <link rel="alternate" hreflang="el" href="http://cds.cern.ch/record/2835876?ln=el" /> <link rel="alternate" hreflang="fr" href="http://cds.cern.ch/record/2835876?ln=fr" /> <link rel="alternate" hreflang="bg" href="http://cds.cern.ch/record/2835876?ln=bg" /> <link rel="alternate" hreflang="zh-TW" href="http://cds.cern.ch/record/2835876?ln=zh_TW" /> <link rel="alternate" hreflang="pt" href="http://cds.cern.ch/record/2835876?ln=pt" /> <link rel="alternate" hreflang="no" href="http://cds.cern.ch/record/2835876?ln=no" /> <link rel="alternate" hreflang="hr" href="http://cds.cern.ch/record/2835876?ln=hr" /> <link rel="alternate" hreflang="ca" href="http://cds.cern.ch/record/2835876?ln=ca" /> <link rel="alternate" hreflang="de" href="http://cds.cern.ch/record/2835876?ln=de" /> <link rel="alternate" hreflang="it" href="http://cds.cern.ch/record/2835876?ln=it" /> <link rel="alternate" hreflang="zh-CN" href="http://cds.cern.ch/record/2835876?ln=zh_CN" /> <link rel="alternate" hreflang="sv" href="http://cds.cern.ch/record/2835876?ln=sv" /> <link rel="alternate" hreflang="sk" href="http://cds.cern.ch/record/2835876?ln=sk" /> <link rel="alternate" hreflang="en" href="http://cds.cern.ch/record/2835876?ln=en" /> <link rel="alternate" hreflang="pl" href="http://cds.cern.ch/record/2835876?ln=pl" /> <link rel="alternate" hreflang="ru" href="http://cds.cern.ch/record/2835876?ln=ru" /> <link rel="alternate" hreflang="ka" href="http://cds.cern.ch/record/2835876?ln=ka" /> <link rel="alternate" hreflang="ja" href="http://cds.cern.ch/record/2835876?ln=ja" /> <link rel="alternate" hreflang="es" href="http://cds.cern.ch/record/2835876?ln=es" /> <link rel="alternate" type="application/rss+xml" title="CERN Document Server RSS" href="/rss?ln=ka" /> <link rel="search" type="application/opensearchdescription+xml" href="http://cds.cern.ch/opensearchdescription" title="CERN Document Server" /> <link rel="unapi-server" type="application/xml" title="unAPI" href="http://cds.cern.ch/unapi" /> <link rel="apple-touch-icon" href="/apple-touch-icon.png"/> <link rel="apple-touch-icon-precomposed" href="/apple-touch-icon-precomposed.png"/> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta http-equiv="Content-Language" content="ka" /> <meta name="description" content="The GEMTEQ is a gaseous detector with Gas Electron Multipliers for signal amplification and Timepix ASICS as highly pixelated readout. It is based on the GEMPix detector and designed for microdosimetry. This paper describes the vacuum chamber developed to house the three versions of the GEMTEQ and to operate the detector in sealed-mode and at low pressure. A sealed version avoiding the need of a gas system offers clear advantages for its transport and use, e.g., for measurements at a clinical particle therapy centre. Operating the detector at a pressure lower than atmospheric increases the spatial resolution, one of the key parameters in microdosimetry. A gas-tight detector housing, a pumping system, and a pressure and temperature monitoring system were developed and tested in operational conditions. These extensive tests have proven the vacuum chamber to be gas tight and well suited for the foreseen microdosimetric measurements: the GEMTEQ can be operated for several weeks at 1000 mbar without noticeable degradation of the detector signal. First measurements have been carried out successfully at pressure values as low as 200 mbar. Further tests are planned to reach the design goal of 10 mbar. Overall, the vacuum chamber fulfils the requirements for a sealed-mode and low-pressure operation of the GEMTEQ. Measurement campaigns using this setup for example for LET measurements in hadron beams have already been carried out and will be discussed in forthcoming papers. Leidner, Johannes; Heracleous, Natalie; Kołodziej, Barbara; Murtas, Fabrizio; Scapini, Alessandro; Silari, Marco; Thomsen, Frederik" /> <meta name="keywords" content="GEM, Timepix, Gaseous detector, Microdosimetry, Vacuum chamber" /> <script type="text/javascript" src="http://cds.cern.ch/js/jquery.min.js"></script>  <link rel="stylesheet" href="http://cds.cern.ch/img/webnews.css" type="text/css" />  <script type="text/javascript" src="http://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="Elsevier B.V. : A vacuum chamber for operation of a GEM-based detector in sealed-mode and at low pressure for LET measurements" name="citation_title" /> <meta content="Leidner, Johannes" name="citation_author" /> <meta content="Kołodziej, Barbara" name="citation_author" /> <meta content="Silari, Marco" name="citation_author" /> <meta content="Murtas, Fabrizio" name="citation_author" /> <meta content="Scapini, Alessandro" name="citation_author" /> <meta content="Thomsen, Frederik" name="citation_author" /> <meta content="Heracleous, Natalie" name="citation_author" /> <meta content="10.1016/j.nima.2022.167365" name="citation_doi" /> <meta content="Nucl. Instrum. Methods Phys. Res., A" name="citation_journal_title" /> <meta content="1041" name="citation_volume" /> <meta content="167365" name="citation_firstpage" /> <meta content="2022" name="citation_publication_date" /> <meta name="citation_online_date" content="2022/10/06"> <meta content="10.1016/j.nima.2022.167365" name="citation_doi" />  <meta content="Elsevier B.V." property="og:title" /> <meta content="A vacuum chamber for operation of a GEM-based detector in sealed-mode and at low pressure for LET measurements" property="og:title" /> <meta content="website" property="og:type" /> <meta content="website" property="og:type" /> <meta content="http://cds.cern.ch/record/2835876" property="og:url" /> <meta content="CERN Document Server" property="og:site_name" /> <meta content="The GEMTEQ is a gaseous detector with Gas Electron Multipliers for signal amplification and Timepix ASICS as highly pixelated readout. It is based on the GEMPix detector and designed for microdosimetry. This paper describes the vacuum chamber developed to house the three versions of the GEMTEQ and to operate the detector in sealed-mode and at low pressure. A sealed version avoiding the need of a gas system offers clear advantages for its transport and use, e.g., for measurements at a clinical particle therapy centre. Operating the detector at a pressure lower than atmospheric increases the spatial resolution, one of the key parameters in microdosimetry. A gas-tight detector housing, a pumping system, and a pressure and temperature monitoring system were developed and tested in operational conditions. These extensive tests have proven the vacuum chamber to be gas tight and well suited for the foreseen microdosimetric measurements: the GEMTEQ can be operated for several weeks at 1000 mbar without noticeable degradation of the detector signal. First measurements have been carried out successfully at pressure values as low as 200 mbar. Further tests are planned to reach the design goal of 10 mbar. Overall, the vacuum chamber fulfils the requirements for a sealed-mode and low-pressure operation of the GEMTEQ. Measurement campaigns using this setup for example for LET measurements in hadron beams have already been carried out and will be discussed in forthcoming papers." property="og:description" /> <meta content="Elsevier B.V." property="og:description" />  <meta content="summary" name="twitter:card" /> <meta content="summary" name="twitter:card" /> <style></style> </head> <body class="CERN32Document32Server search" lang="ka">  <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=ka&referer=http%3A//cds.cern.ch/record/2835876%3Fln%3Dka" 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="http://cds.cern.ch/?ln=ka">ძებნა</a></li> <li class="menu-444 "><a class="" title="" href="http://cds.cern.ch/submit?ln=ka">დაყენება</a></li> <li class="menu-426 "><a class="" href="http://cds.cern.ch/help/?ln=ka">დახმარება</a></li> <li class="leaf hassubcdsmenu"> <a hreflang="en" class="header" href="https://cds.cern.ch/youraccount/display?ln=ka">პერს</a> <ul class="subsubcdsmenu"><li><a href="https://cds.cern.ch/youralerts/list?ln=ka">თქვენი ცვლილებები</a></li><li><a href="https://cds.cern.ch/yourbaskets/display?ln=ka">თქვენი კალათები</a></li><li><a href="https://cds.cern.ch/yourcomments?ln=ka">Your comments</a></li><li><a href="https://cds.cern.ch/youralerts/display?ln=ka">თქვენი ძებნა</a></li></ul></li> </ul> </div> </div> </div>  <table class="navtrailbox"> <tr> <td class="navtrailboxbody"> <a href="/?ln=ka" class="navtrail">მთავარი</a> > A vacuum chamber for operation of a GEM-based detector in sealed-mode and at low pressure for LET measurements </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/2835876/?ln=ka">ინფორმაცია </a></li><li class="disabled"><a>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="2835876"></abbr> <style type="text/css">  </style> <table class="formatRecordTableFullWidth" > <tr> <td class="formatRecordHeader" style="background-image: url('http://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>A vacuum chamber for operation of a GEM-based detector in sealed-mode and at low pressure for LET measurements</b></td></tr> <tr><td class="formatRecordLabel"><span style="white-space:nowrap;"> Author(s) </span> </td><td style="padding-left:5px;"><a href="http://cds.cern.ch/search?f=author&p=Leidner%2C%20Johannes&ln=ka">Leidner, Johannes</a> (CERN) ; <a href="http://cds.cern.ch/search?f=author&p=Heracleous%2C%20Natalie&ln=ka">Heracleous, Natalie</a> (CERN) ; <a href="http://cds.cern.ch/search?f=author&p=Ko%C5%82odziej%2C%20Barbara&ln=ka">Kołodziej, Barbara</a> (CERN ; Jagiellonian U.) ; <a href="http://cds.cern.ch/search?f=author&p=Murtas%2C%20Fabrizio&ln=ka">Murtas, Fabrizio</a> (CERN ; LNF, Dafne Light) ; <a href="http://cds.cern.ch/search?f=author&p=Scapini%2C%20Alessandro&ln=ka">Scapini, Alessandro</a> (CERN ; Milan, Polytech.) ; <a href="http://cds.cern.ch/search?f=author&p=Silari%2C%20Marco&ln=ka">Silari, Marco</a> (CERN) ; <a href="http://cds.cern.ch/search?f=author&p=Thomsen%2C%20Frederik&ln=ka">Thomsen, Frederik</a> (CERN ; Aarhus U. (main))</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;">11</td></tr> <tr><td class="formatRecordLabel"> In: </td><td style="padding-left:5px;"><i>Nucl. Instrum. Methods Phys. Res., A</i> 1041 (2022) pp.167365</td></tr> <tr><td class="formatRecordLabel"> In: </td><td style="padding-left:5px;"><a href="http://cds.cern.ch/record/2801323">Vienna Conference on Instrumentation (VCI 2022)</a>, Online, Austria, 21 - 25 Feb 2022, pp.167365</td></tr> <tr><td class="formatRecordLabel"> DOI </td><td style="padding-left:5px;"><a href="http://dx.doi.org/10.1016/j.nima.2022.167365" title="DOI" target="_blank">10.1016/j.nima.2022.167365</a> (publication) <tr><td class="formatRecordLabel"> Subject category </td><td style="padding-left:5px;">Detectors and Experimental Techniques</td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">The GEMTEQ is a gaseous detector with Gas Electron Multipliers for signal amplification and Timepix ASICS as highly pixelated readout. It is based on the GEMPix detector and designed for microdosimetry. This paper describes the vacuum chamber developed to house the three versions of the GEMTEQ and to operate the detector in sealed-mode and at low pressure. A sealed version avoiding the need of a gas system offers clear advantages for its transport and use, e.g., for measurements at a clinical particle therapy centre. Operating the detector at a pressure lower than atmospheric increases the spatial resolution, one of the key parameters in microdosimetry. A gas-tight detector housing, a pumping system, and a pressure and temperature monitoring system were developed and tested in operational conditions. These extensive tests have proven the vacuum chamber to be gas tight and well suited for the foreseen microdosimetric measurements: the GEMTEQ can be operated for several weeks at 1000 mbar without noticeable degradation of the detector signal. First measurements have been carried out successfully at pressure values as low as 200 mbar. Further tests are planned to reach the design goal of 10 mbar. Overall, the vacuum chamber fulfils the requirements for a sealed-mode and low-pressure operation of the GEMTEQ. Measurement campaigns using this setup for example for LET measurements in hadron beams have already been carried out and will be discussed in forthcoming papers.</td></tr> <tr><td class="formatRecordLabel"> Copyright/License </td><td style="padding-left:5px;">publication: © 2022 Published by Elsevier B.V.</td></tr> </table> <br/>Corresponding record in: <a href="http://inspirehep.net/record/2145704">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"> ჩანაწერი შექმნილია 2022-10-06, ბოლოს შესწორებულია 2022-10-06</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=ka&p=recid%3A2835876&rm=wrd" class="moreinfo">მსგავსი ჩანაწერები</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"> <br/> </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=ka&recid=2835876">პირად კალათაში დამატება</a></li> <li>ექსპორტირება <a style="text-decoration:underline;font-weight:normal" href="/record/2835876/export/hx?ln=ka">BibTeX</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2835876/export/hm?ln=ka">MARC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2835876/export/xm?ln=ka">MARCXML</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2835876/export/xd?ln=ka">DC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2835876/export/xe?ln=ka">EndNote</a>,  <a style="text-decoration:underline;font-weight:normal" href="/record/2835876/export/xn?ln=ka">NLM</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2835876/export/xw?ln=ka">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', 'http://cds.cern.ch/img/sciencewise.png', 'en', 'bookmark', 'http://sciencewise.info/bookmarks/cds:2835876/add'); $('#bookmark_sciencewise').bookmark({sites: ['sciencewise']}); $('#bookmark').bookmark({ sites: ['facebook', 'twitter', 'linkedin', 'google_plusone'], icons: '/img/bookmarks.png', url: 'http://cds.cern.ch/record/2835876', addEmail: true, title: "A vacuum chamber for operation of a GEM-based detector in sealed-mode and at low pressure for LET measurements", description: "The GEMTEQ is a gaseous detector with Gas Electron Multipliers for signal amplification and Timepix ASICS as highly pixelated readout. It is based on the GEMPix detector and designed for microdosimetry. This paper describes the vacuum chamber developed to house the three versions of the GEMTEQ and to operate the detector in sealed-mode and at low pressure. A sealed version avoiding the need of a gas system offers clear advantages for its transport and use, e.g., for measurements at a clinical particle therapy centre. Operating the detector at a pressure lower than atmospheric increases the spatial resolution, one of the key parameters in microdosimetry. A gas-tight detector housing, a pumping system, and a pressure and temperature monitoring system were developed and tested in operational conditions. These extensive tests have proven the vacuum chamber to be gas tight and well suited for the foreseen microdosimetric measurements: the GEMTEQ can be operated for several weeks at 1000 mbar without noticeable degradation of the detector signal. First measurements have been carried out successfully at pressure values as low as 200 mbar. Further tests are planned to reach the design goal of 10 mbar. Overall, the vacuum chamber fulfils the requirements for a sealed-mode and low-pressure operation of the GEMTEQ. Measurement campaigns using this setup for example for LET measurements in hadron beams have already been carried out and will be discussed in forthcoming papers." }); // ]]> </script>  </div> </div> <div style="clear:both;margin-bottom: 0;"></div> </div> <div class="bottom-left"></div><div class="bottom-right"></div> </div> </div></div> <footer id="footer" class="pagefooter clearfix">  <div class="pagefooterstripeleft"> CERN Document Server :: <a class="footer" href="http://cds.cern.ch/?ln=ka">ძებნა</a> :: <a class="footer" href="http://cds.cern.ch/submit?ln=ka">დაყენება</a> :: <a class="footer" href="https://cds.cern.ch/youraccount/display?ln=ka">პერს</a> :: <a class="footer" href="http://cds.cern.ch/help/?ln=ka">დახმარება</a> :: <a class="footer" href="https://cern.service-now.com/service-portal?id=privacy_policy&se=CDS-Service" target="_blank">Privacy Notice</a> :: <a class="footer" href="https://repository.cern/content-policy" target="_blank">Content Policy</a> :: <a class="footer" href="https://repository.cern/terms" target="_blank">Terms and Conditions</a> <br /> დაფუძნებულია <a class="footer" href="http://invenio-software.org/">Invenio</a> <br /> შენახულია <a class="footer" href="https://cern.service-now.com/service-portal?id=service_element&name=CDS-Service">CDS Service</a> - Need help? Contact <a href="https://cern.service-now.com/service-portal?id=service_element&name=CDS-Service">CDS Support</a>. <br /> </div> <div class="pagefooterstriperight"> <div class="cern-logo"> <a id="logo" href="http://cern.ch" title="CERN" rel="CERN" ><img src="http://cds.cern.ch/img/cern_theme/img/cern-logo-large.png" alt="CERN" /></a> </div> <div class="cern-languagebox"> ეს საიტი ასევე ხელმისაწვდომია შემდეგ ენებში:<br /><a href="/record/2835876?ln=bg" class="langinfo">Български</a>  <a href="/record/2835876?ln=ca" class="langinfo">Català</a>  <a href="/record/2835876?ln=de" class="langinfo">Deutsch</a>  <a href="/record/2835876?ln=el" class="langinfo">Ελληνικά</a>  <a href="/record/2835876?ln=en" class="langinfo">English</a>  <a href="/record/2835876?ln=es" class="langinfo">Español</a>  <a href="/record/2835876?ln=fr" class="langinfo">Français</a>  <a href="/record/2835876?ln=hr" class="langinfo">Hrvatski</a>  <a href="/record/2835876?ln=it" class="langinfo">Italiano</a>  <a href="/record/2835876?ln=ja" class="langinfo">日本語</a>  <span class="langinfo">ქართული</span>  <a href="/record/2835876?ln=no" class="langinfo">Norsk/Bokmål</a>  <a href="/record/2835876?ln=pl" class="langinfo">Polski</a>  <a href="/record/2835876?ln=pt" class="langinfo">Português</a>  <a href="/record/2835876?ln=ru" class="langinfo">Русский</a>  <a href="/record/2835876?ln=sk" class="langinfo">Slovensky</a>  <a href="/record/2835876?ln=sv" class="langinfo">Svenska</a>  <a href="/record/2835876?ln=zh_CN" class="langinfo">中文(简)</a>  <a href="/record/2835876?ln=zh_TW" class="langinfo">中文(繁)</a> </div> </div>  </footer> <script type="text/javascript"> var SyndeticsBookCovers = (function() { var SMALL_SIZE = "sc.gif", MEDIUM_SIZE = "mc.gif", RAW_URL = "https://secure.syndetics.com/index.aspx?isbn=THEISBN/THESIZE&client=cernlibrary"; replaceCover = function(imgElement, isbns, hdFormat) { var img = new Image(), size = hdFormat ? MEDIUM_SIZE : SMALL_SIZE; var _isbns = isbns.sort(function(a, b) { // sort from shortest to longest ISBN (more modern) return a.length > b.length ? 1 : -1; }); function next() { var isbn = _isbns.pop(); if (isbn) { var url = RAW_URL.replace("THEISBN", isbn).replace("THESIZE", size); img.src = url; } } function done() { imgElement.src = img.src; } img.onload = function() { if (this.width > 1) { done(); } else { next(); } }; next(); }; return { replaceCover: replaceCover }; })(); $(document).ready(function() { // get book covers $("img.book-cover").each(function() { var $this = $(this), strIsbns = $this.data("isbns") || "", isbnsArray = String(strIsbns).split(","), hdFormat = $this.hasClass("hd"); SyndeticsBookCovers.replaceCover(this, isbnsArray, hdFormat); }); // WebNews tooltips $.ajax({ url: "/news/tooltips", success: function(data) { create_tooltips(data); }, dataType: "json", cache: false }); }); </script>  <script src="//cds.cern.ch/js/feedback.js"></script>   <script> var _paq = window._paq = window._paq || []; /* tracker methods like "setCustomDimension" should be called before "trackPageView" */ _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (function() { var u="https://webanalytics.web.cern.ch/"; _paq.push(['setTrackerUrl', u+'matomo.php']); _paq.push(['setSiteId', '756']); var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0]; g.async=true; g.src=u+'matomo.js'; s.parentNode.insertBefore(g,s); })(); </script>  </body> </html>