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="zh" xml:lang="zh" xmlns:og="http://ogp.me/ns#" xmlns:fb="http://ogp.me/ns/fb#"> <head> <title>LHC Collimators with Embedded Beam Position Monitors: A New Advanced Mechanical Design - 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="https://cds.cern.ch/img/invenio.css?v=20141127" type="text/css" /> <link rel="stylesheet" href="https://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="https://cds.cern.ch/img/cern_toolbar/css/toolbar.css" type="text/css" />    <link rel="canonical" href="https://cds.cern.ch/record/1402570" /> <link rel="alternate" hreflang="el" href="https://cds.cern.ch/record/1402570?ln=el" /> <link rel="alternate" hreflang="fr" href="https://cds.cern.ch/record/1402570?ln=fr" /> <link rel="alternate" hreflang="bg" href="https://cds.cern.ch/record/1402570?ln=bg" /> <link rel="alternate" hreflang="zh-TW" href="https://cds.cern.ch/record/1402570?ln=zh_TW" /> <link rel="alternate" hreflang="pt" href="https://cds.cern.ch/record/1402570?ln=pt" /> <link rel="alternate" hreflang="no" href="https://cds.cern.ch/record/1402570?ln=no" /> <link rel="alternate" hreflang="hr" href="https://cds.cern.ch/record/1402570?ln=hr" /> <link rel="alternate" hreflang="ca" href="https://cds.cern.ch/record/1402570?ln=ca" /> <link rel="alternate" hreflang="de" href="https://cds.cern.ch/record/1402570?ln=de" /> <link rel="alternate" hreflang="it" href="https://cds.cern.ch/record/1402570?ln=it" /> <link rel="alternate" hreflang="zh-CN" href="https://cds.cern.ch/record/1402570?ln=zh_CN" /> <link rel="alternate" hreflang="sv" href="https://cds.cern.ch/record/1402570?ln=sv" /> <link rel="alternate" hreflang="sk" href="https://cds.cern.ch/record/1402570?ln=sk" /> <link rel="alternate" hreflang="en" href="https://cds.cern.ch/record/1402570?ln=en" /> <link rel="alternate" hreflang="pl" href="https://cds.cern.ch/record/1402570?ln=pl" /> <link rel="alternate" hreflang="ru" href="https://cds.cern.ch/record/1402570?ln=ru" /> <link rel="alternate" hreflang="ka" href="https://cds.cern.ch/record/1402570?ln=ka" /> <link rel="alternate" hreflang="ja" href="https://cds.cern.ch/record/1402570?ln=ja" /> <link rel="alternate" hreflang="es" href="https://cds.cern.ch/record/1402570?ln=es" /> <link rel="alternate" type="application/rss+xml" title="CERN Document Server RSS" href="/rss?ln=zh_CN" /> <link rel="search" type="application/opensearchdescription+xml" href="https://cds.cern.ch/opensearchdescription" title="CERN Document Server" /> <link rel="unapi-server" type="application/xml" title="unAPI" href="https://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="zh_CN" /> <meta name="description" content="The LHC collimation system, ensuring both functions of beam cleaning and machine protection, is potentially submitted to high-energy beam impacts. Currently the collimators setup is performed by monitoring beam losses generated by the collimator jaws when approaching the particle beam. This procedure is applied to all LHC collimators (almost one hundred), taking several hours, and needs to be repeated if beam settings change significantly. Furthermore, during the beam-based alignment, the LHC tertiary collimators are potentially exposed to abnormal losses entailing possible damage to their tungsten jaws. To improve the efficiency of the machine operation and better control the particle beam a new advanced design embedding Beam Position Monitors (BPM) into the movable collimator jaws has been developed. This paper describes the mechanical design of various types of future collimators with embedded BPMs. Experimental measurements performed on a simplified functional prototype installed in the CERN SPS showed that, thanks to on-board BPMs, the collimator could be precisely, rapidly, and safely aligned and the beam position accurately measured. Dallocchio, A; Bertarelli, A; Boccard, C; Carra, F; Gasior, M; Gentini, L; Timmins, M A" /> <meta name="keywords" content="CERN Document Server, WebSearch, CERN Document Server" /> <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="LHC Collimators with Embedded Beam Position Monitors: A New Advanced Mechanical Design" name="citation_title" /> <meta content="Dallocchio, A" name="citation_author" /> <meta content="Gasior, M" name="citation_author" /> <meta content="Boccard, C" name="citation_author" /> <meta content="Carra, F" name="citation_author" /> <meta content="Timmins, M A" name="citation_author" /> <meta content="Bertarelli, A" name="citation_author" /> <meta content="Gentini, L" name="citation_author" /> <meta content="2011/11/29" name="citation_publication_date" /> <meta name="citation_online_date" content="2011/11/29"> <meta content="CERN-ATS-2011-228" name="citation_technical_report_number" /> <meta name="citation_pdf_url" content="https://cds.cern.ch/record/1402570/files/CERN-ATS-2011-228.pdf" />  <meta content="LHC Collimators with Embedded Beam Position Monitors: A New Advanced Mechanical Design" property="og:title" /> <meta content="website" property="og:type" /> <meta content="website" property="og:type" /> <meta content="https://cds.cern.ch/record/1402570" property="og:url" /> <meta content="CERN Document Server" property="og:site_name" /> <meta content="The LHC collimation system, ensuring both functions of beam cleaning and machine protection, is potentially submitted to high-energy beam impacts. Currently the collimators setup is performed by monitoring beam losses generated by the collimator jaws when approaching the particle beam. This procedure is applied to all LHC collimators (almost one hundred), taking several hours, and needs to be repeated if beam settings change significantly. Furthermore, during the beam-based alignment, the LHC tertiary collimators are potentially exposed to abnormal losses entailing possible damage to their tungsten jaws. To improve the efficiency of the machine operation and better control the particle beam a new advanced design embedding Beam Position Monitors (BPM) into the movable collimator jaws has been developed. This paper describes the mechanical design of various types of future collimators with embedded BPMs. Experimental measurements performed on a simplified functional prototype installed in the CERN SPS showed that, thanks to on-board BPMs, the collimator could be precisely, rapidly, and safely aligned and the beam position accurately measured." property="og:description" />  <meta content="summary" name="twitter:card" /> <meta content="summary" name="twitter:card" /> <style></style> </head> <body class="CERN32Document32Server search" lang="zh">  <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=zh_CN&referer=https%3A//cds.cern.ch/record/1402570%3Fln%3Dzh_CN" 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=zh_CN">搜寻</a></li> <li class="menu-444 "><a class="" title="" href="https://cds.cern.ch/submit?ln=zh_CN">提交</a></li> <li class="menu-426 "><a class="" href="https://cds.cern.ch/help/?ln=zh_CN">帮助</a></li> <li class="leaf hassubcdsmenu"> <a hreflang="en" class="header" href="https://cds.cern.ch/youraccount/display?ln=zh_CN">个人化</a> <ul class="subsubcdsmenu"><li><a href="https://cds.cern.ch/youralerts/list?ln=zh_CN">Your alerts</a></li><li><a href="https://cds.cern.ch/yourbaskets/display?ln=zh_CN">Your baskets</a></li><li><a href="https://cds.cern.ch/yourcomments?ln=zh_CN">Your comments</a></li><li><a href="https://cds.cern.ch/youralerts/display?ln=zh_CN">Your searches</a></li></ul></li> </ul> </div> </div> </div>  <table class="navtrailbox"> <tr> <td class="navtrailboxbody"> <a href="/?ln=zh_CN" class="navtrail">主页</a> > LHC Collimators with Embedded Beam Position Monitors: A New Advanced Mechanical Design </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/1402570/?ln=zh_CN">Information </a></li><li class=""><a href="/record/1402570/files?ln=zh_CN">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="1402570"></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"> Report number </td><td style="padding-left:5px;">CERN-ATS-2011-228</td></tr> <tr><td class="formatRecordLabel"> Title </td><td style="padding-left:5px;"><b>LHC Collimators with Embedded Beam Position Monitors: A New Advanced Mechanical Design</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=Dallocchio%2C%20A&ln=zh_CN">Dallocchio, A</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Bertarelli%2C%20A&ln=zh_CN">Bertarelli, A</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Boccard%2C%20C&ln=zh_CN">Boccard, C</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Carra%2C%20F&ln=zh_CN">Carra, F</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Gasior%2C%20M&ln=zh_CN">Gasior, M</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Gentini%2C%20L&ln=zh_CN">Gentini, L</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Timmins%2C%20M%20A&ln=zh_CN">Timmins, M A</a> (CERN)</td></tr> <tr><td class="formatRecordLabel"> Publication </td><td style="padding-left:5px;">2011</td></tr> <tr><td class="formatRecordLabel"> Imprint </td><td style="padding-left:5px;">29 Nov 2011</td></tr> <tr><td class="formatRecordLabel"> Number of pages </td><td style="padding-left:5px;">4</td></tr> <tr><td class="formatRecordLabel"> In: </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/record/1378144">2nd International Particle Accelerator Conference</a>, San Sebastian, Spain, 4 - 9 Sep 2011, pp.TUPS035</td></tr> <tr><td class="formatRecordLabel"> Subject category </td><td style="padding-left:5px;">Accelerators and Storage Rings</td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">The LHC collimation system, ensuring both functions of beam cleaning and machine protection, is potentially submitted to high-energy beam impacts. Currently the collimators setup is performed by monitoring beam losses generated by the collimator jaws when approaching the particle beam. This procedure is applied to all LHC collimators (almost one hundred), taking several hours, and needs to be repeated if beam settings change significantly. Furthermore, during the beam-based alignment, the LHC tertiary collimators are potentially exposed to abnormal losses entailing possible damage to their tungsten jaws. To improve the efficiency of the machine operation and better control the particle beam a new advanced design embedding Beam Position Monitors (BPM) into the movable collimator jaws has been developed. This paper describes the mechanical design of various types of future collimators with embedded BPMs. Experimental measurements performed on a simplified functional prototype installed in the CERN SPS showed that, thanks to on-board BPMs, the collimator could be precisely, rapidly, and safely aligned and the beam position accurately measured.</td></tr> <tr><td class="formatRecordLabel"> Copyright/License </td><td style="padding-left:5px;">publication: (License: CC-BY)</td></tr> </table> <br/>Email contact: <a href="mailto:sonia.escaffre@cern.ch">sonia.escaffre@cern.ch</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"> 记录创建於2011-11-29，最後更新在2024-02-23</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=zh_CN&p=recid%3A1402570&rm=wrd" class="moreinfo">相似记录</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">全文:</small> <br /><a href="/record/1402570/files/CERN-ATS-2011-228.pdf"><img style="border:none" src="/img/file-icon-text-12x16.gif" alt="Download fulltext"/>PDF</a><br /></div><small class="detailedRecordActions">External link:</small><br /><small><a href="https://accelconf.web.cern.ch/IPAC2011/papers/TUPS035.pdf"><img style="border:none" src="/img/file-icon-text-12x16.gif" alt="Download fulltext"/>Published version from JACoW</a></small> </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=zh_CN&recid=1402570">Add to personal basket</a></li> <li>Export as <a style="text-decoration:underline;font-weight:normal" href="/record/1402570/export/hx?ln=zh_CN">BibTeX</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/1402570/export/hm?ln=zh_CN">MARC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/1402570/export/xm?ln=zh_CN">MARCXML</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/1402570/export/xd?ln=zh_CN">DC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/1402570/export/xe?ln=zh_CN">EndNote</a>,  <a style="text-decoration:underline;font-weight:normal" href="/record/1402570/export/xn?ln=zh_CN">NLM</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/1402570/export/xw?ln=zh_CN">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:1402570/add'); $('#bookmark_sciencewise').bookmark({sites: ['sciencewise']}); $('#bookmark').bookmark({ sites: ['facebook', 'twitter', 'linkedin', 'google_plusone'], icons: '/img/bookmarks.png', url: 'https://cds.cern.ch/record/1402570', addEmail: true, title: "LHC Collimators with Embedded Beam Position Monitors: A New Advanced Mechanical Design", description: "The LHC collimation system, ensuring both functions of beam cleaning and machine protection, is potentially submitted to high-energy beam impacts. Currently the collimators setup is performed by monitoring beam losses generated by the collimator jaws when approaching the particle beam. This procedure is applied to all LHC collimators (almost one hundred), taking several hours, and needs to be repeated if beam settings change significantly. Furthermore, during the beam-based alignment, the LHC tertiary collimators are potentially exposed to abnormal losses entailing possible damage to their tungsten jaws. To improve the efficiency of the machine operation and better control the particle beam a new advanced design embedding Beam Position Monitors (BPM) into the movable collimator jaws has been developed. This paper describes the mechanical design of various types of future collimators with embedded BPMs. Experimental measurements performed on a simplified functional prototype installed in the CERN SPS showed that, thanks to on-board BPMs, the collimator could be precisely, rapidly, and safely aligned and the beam position accurately measured." }); // ]]> </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="https://cds.cern.ch/?ln=zh_CN">搜寻</a> :: <a class="footer" href="https://cds.cern.ch/submit?ln=zh_CN">提交</a> :: <a class="footer" href="https://cds.cern.ch/youraccount/display?ln=zh_CN">个人化</a> :: <a class="footer" href="https://cds.cern.ch/help/?ln=zh_CN">帮助</a> :: <a class="footer" href="https://cern.service-now.com/service-portal?id=privacy_policy&se=CDS-Service" target="_blank">Privacy Notice</a> <br /> 伺服器系统： <a class="footer" href="http://invenio-software.org/">Invenio</a> <br /> 管理者： <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="https://cds.cern.ch/img/cern_theme/img/cern-logo-large.png" alt="CERN" /></a> </div> <div class="cern-languagebox"> 本网站提供以下语言选择:<br /><a href="/record/1402570?ln=bg" class="langinfo">Български</a>  <a href="/record/1402570?ln=ca" class="langinfo">Català</a>  <a href="/record/1402570?ln=de" class="langinfo">Deutsch</a>  <a href="/record/1402570?ln=el" class="langinfo">Ελληνικά</a>  <a href="/record/1402570?ln=en" class="langinfo">English</a>  <a href="/record/1402570?ln=es" class="langinfo">Español</a>  <a href="/record/1402570?ln=fr" class="langinfo">Français</a>  <a href="/record/1402570?ln=hr" class="langinfo">Hrvatski</a>  <a href="/record/1402570?ln=it" class="langinfo">Italiano</a>  <a href="/record/1402570?ln=ja" class="langinfo">日本語</a>  <a href="/record/1402570?ln=ka" class="langinfo">ქართული</a>  <a href="/record/1402570?ln=no" class="langinfo">Norsk/Bokmål</a>  <a href="/record/1402570?ln=pl" class="langinfo">Polski</a>  <a href="/record/1402570?ln=pt" class="langinfo">Português</a>  <a href="/record/1402570?ln=ru" class="langinfo">Русский</a>  <a href="/record/1402570?ln=sk" class="langinfo">Slovensky</a>  <a href="/record/1402570?ln=sv" class="langinfo">Svenska</a>  <span class="langinfo">中文(简)</span>  <a href="/record/1402570?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>