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Level-1 Tracking at CMS for the HL-LHC - CERN Document Server
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With an average expected 200 pileup interactions, it is critical to achieve this while maintaining manageable trigger rates by including tracking information in the Level-1 (L1) trigger. A 40\,MHz silicon-based track trigger on the scale of the CMS central tracking system has never been built and can enable entirely new physics studies. The main challenges of reconstructing tracks in the L1 trigger are the large data throughput at 40\,MHz and the need for a trigger decision within 12.5\,$\mu$s. To address these challenges, the CMS Outer Tracker for the HL-LHC uses modules with closely spaced silicon sensors to read out only hits compatible with charged particles above 2\,GeV. This contribution will discuss the L1 tracking algorithm and its implementation, present simulation studies of the estimated performance, and show results from hardware studies at the CERN Tracker Integration Facility. Mark Steven Larson" /> <meta name="keywords" content="Tracker" /> <script type="text/javascript" src="https://cds.cern.ch/js/jquery.min.js"></script> <!-- WebNews CSS library --> <link rel="stylesheet" href="https://cds.cern.ch/img/webnews.css" type="text/css" /> <!-- WebNews JS library --> <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> <!-- GoogleScholar --> <meta content="Level-1 Tracking at CMS for the HL-LHC" name="citation_title" /> <meta content="Mark Steven Larson" name="citation_author" /> <meta content="2024/10/26" name="citation_publication_date" /> <meta name="citation_online_date" content="2024/11/11"> <meta content="CMS-CR-2024-282" name="citation_technical_report_number" /> <meta name="citation_pdf_url" content="https://cds.cern.ch/record/2916734/files/CR2024_282.pdf" /> <!-- OpenGraph --> <meta content="Level-1 Tracking at CMS for the HL-LHC" property="og:title" /> <meta content="website" property="og:type" /> <meta content="website" property="og:type" /> <meta content="website" property="og:type" /> <meta content="https://cds.cern.ch/record/2916734" property="og:url" /> <meta content="CERN Document Server" property="og:site_name" /> <meta content="The success of the CMS physics program at the HL-LHC requires maintaining sufficiently low trigger thresholds to select physics processes. With an average expected 200 pileup interactions, it is critical to achieve this while maintaining manageable trigger rates by including tracking information in the Level-1 (L1) trigger. A 40\,MHz silicon-based track trigger on the scale of the CMS central tracking system has never been built and can enable entirely new physics studies. The main challenges of reconstructing tracks in the L1 trigger are the large data throughput at 40\,MHz and the need for a trigger decision within 12.5\,$\mu$s. To address these challenges, the CMS Outer Tracker for the HL-LHC uses modules with closely spaced silicon sensors to read out only hits compatible with charged particles above 2\,GeV. This contribution will discuss the L1 tracking algorithm and its implementation, present simulation studies of the estimated performance, and show results from hardware studies at the CERN Tracker Integration Facility." property="og:description" /> <!-- Twitter Card --> <meta content="summary" name="twitter:card" /> <meta content="summary" name="twitter:card" /> <meta content="summary" name="twitter:card" /> <style></style> </head> <body class="CMS32Preprints search" lang="en"> <!-- toolbar starts --> <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=en&referer=https%3A//cds.cern.ch/record/2916734" 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> <!-- toolbar ends --> <!-- Nav header starts--> <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><!-- /#name-and-slogan --> <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=en">Search</a></li> <li class="menu-444 "><a class="" title="" href="https://cds.cern.ch/submit?ln=en">Submit</a></li> <li class="menu-426 "><a class="" href="https://cds.cern.ch/help/?ln=en">Help</a></li> <li class="leaf hassubcdsmenu"> <a hreflang="en" class="header" href="https://cds.cern.ch/youraccount/display?ln=en">Personalize</a> <ul class="subsubcdsmenu"><li><a href="https://cds.cern.ch/youralerts/list?ln=en">Your alerts</a></li><li><a href="https://cds.cern.ch/yourbaskets/display?ln=en">Your baskets</a></li><li><a href="https://cds.cern.ch/yourcomments?ln=en">Your comments</a></li><li><a href="https://cds.cern.ch/youralerts/display?ln=en">Your searches</a></li></ul></li> </ul> </div> </div> </div> <!-- Nav header ends--> <table class="navtrailbox"> <tr> <td class="navtrailboxbody"> <a href="/?ln=en" class="navtrail">Home</a> > <a href="/collection/CMS%20Collection?ln=en" class="navtrail">CMS Collection</a> > <a href="/collection/CMS%20Preprints?ln=en" class="navtrail">CMS Preprints</a> > Level-1 Tracking at CMS for the HL-LHC </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/2916734/?ln=en">Information </a></li><li class=""><a href="/record/2916734/references?ln=en">References </a></li><li class=""><a href="/record/2916734/comments?ln=en">Discussion (0) </a></li><li class=""><a href="/record/2916734/files?ln=en">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"> <!--<div style="height:0.1em;"> </div> <p class="notopgap"> </p>--> <abbr class="unapi-id" title="2916734"></abbr> <!-- Add download buttons css --> <link href="/img/download_and_embed_buttons.css" rel="stylesheet" type="text/css" /> <style type="text/css"> <!-- ul.detailedrecordtabs li.on a{background-color:#4D94CC;color:#fff !important;border-bottom:1px solid #4D94CC!important;} div.detailedrecordboxcontent {padding-top:0px !important;} table.formatRecordTableFullWidth #download_movie_box { width: 500px; margin: 0; } table.formatRecordTableFullWidth #embed_video_box { width: inherit; margin: 0; } --> .video_talk_wrapper{ max-width: 640px; min-height: 360px; } </style> <table class="formatRecordTableFullWidth"> <tr> <td class="formatRecordHeader" style="background-image: url('/img/journals.jpg');" colspan="2"> <!--YTD: record may have more than one 690C.a tag--> CMS Note </td> </tr> <tr><td class="formatRecordLabel"> Report number </td><td style="padding-left:5px;">CMS-CR-2024-282</td></tr> <tr><td class="formatRecordLabel"> Title </td><td style="padding-left:5px;"><b>Level-1 Tracking at CMS for the HL-LHC</b></td></tr> <style> .video_control_container, #video_controlbutton { display: none; }#video_detailbox_download {display: none;}#video_detailbox_embed {display: none;}</style> <div class="video_control_container"> <div style="box-sizing: inherit;position: relative;min-height: 1em;margin: 1em 0;background: #f8f8f9;padding: 1em 1.5em;line-height: 1.4285em;transition: opacity .1s ease,color .1s ease,background .1s ease,box-shadow .1s ease,-webkit-box-shadow .1s ease;border-radius: .28571429rem;font-size: 1.1em;margin-top: 0;margin-bottom: 6px;background-color: #f8ffff;color: #276f86;box-shadow: 0 0 0 1px #a9d5de inset,0 0 0 0 transparent;"> <i class="fa fa-info"></i><span style="padding-left: 9px;">If you experience any problem watching the video, click the download button below</span> </div> <a id="video_controlbutton_download" rel="download_button" class="video_controlbutton" href="#">Download</a> <a id="video_controlbutton_embed" class="video_controlbutton" href="#">Embed</a> </div> <div id="video_detailbox_download" style="margin:10px"> </div> <div id="video_detailbox_embed" style="margin:10px"> </div> <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=Mark%20Steven%20Larson&ln=en">Mark Steven Larson</a></td></tr> <tr><td class="formatRecordLabel"> Publication </td><td style="padding-left:5px;">2024</td></tr> <tr><td class="formatRecordLabel"> Collaboration </td><td style="padding-left:5px;">CMS Collaboration</td></tr> <!-- In case of ``980__a:E-LEARNING``, the label is changed by a javascript code above as requested on RQF0820114 --> <script type="text/javascript"> /* * Changes the Imprint title to Date - Duration as requested by RQF0820114 * This is a hack not to touch the general imprint format element */ $(document).ready(function() { var collections = 'INTNOTECMSPUBL ; ConferencePaper ; PREPRINT'; if (collections.indexOf('E-LEARNING') > -1) { $('.cern-imprint-label').text('Date - Duration'); } }) </script> <tr><td class="formatRecordLabel cern-imprint-label"> Imprint </td><td style="padding-left:5px;">26 Oct 2024</td></tr> <tr><td class="formatRecordLabel"> Number of pages </td><td style="padding-left:5px;">7</td></tr> <!-- End --> <tr><td class="formatRecordLabel"> Presented at </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/record/2897247">12th Edition of the Large Hadron Collider Physics Conference (LHCP2024)</a>, Boston, United States, 3 - 7 Jun 2024</td></tr> <tr><td class="formatRecordLabel"> Subject category </td><td style="padding-left:5px;">Detectors and Experimental Techniques</td></tr> <tr><td class="formatRecordLabel"> Accelerator/Facility, Experiment </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/search?p=CERN%20LHC&f=693__a">CERN LHC</a> ; <a href="https://cds.cern.ch/search?p=CMS&f=693__e">CMS</a></td></tr> <tr><td class="formatRecordLabel"> Keywords </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/search?f=keyword&p=Tracker&ln=en">Tracker</a></td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">The success of the CMS physics program at the HL-LHC requires maintaining sufficiently low trigger thresholds to select physics processes. With an average expected 200 pileup interactions, it is critical to achieve this while maintaining manageable trigger rates by including tracking information in the Level-1 (L1) trigger. A 40\,MHz silicon-based track trigger on the scale of the CMS central tracking system has never been built and can enable entirely new physics studies. The main challenges of reconstructing tracks in the L1 trigger are the large data throughput at 40\,MHz and the need for a trigger decision within 12.5\,$\mu$s. To address these challenges, the CMS Outer Tracker for the HL-LHC uses modules with closely spaced silicon sensors to read out only hits compatible with charged particles above 2\,GeV. This contribution will discuss the L1 tracking algorithm and its implementation, present simulation studies of the estimated performance, and show results from hardware studies at the CERN Tracker Integration Facility.</td></tr> </table> <br/><div><div style="clear: both;"> </div></div> <script type="text/javascript"> // Initially hide: $(".longCaption").hide(); // Allow to toggle visibility: $(".toggleLongCaption").toggle(function(){ $(this).siblings(".longCaption").show('fast'); var thisElem = $(this); thisElem.text(thisElem.text() === "more" ? "less" : "more"); },function(){ $(this).siblings(".longCaption").hide('fast'); var thisElem = $(this); thisElem.text(thisElem.text() === "more" ? 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With an average expected 200 pileup interactions, it is critical to achieve this while maintaining manageable trigger rates by including tracking information in the Level-1 (L1) trigger. A 40\\,MHz silicon-based track trigger on the scale of the CMS central tracking system has never been built and can enable entirely new physics studies. The main challenges of reconstructing tracks in the L1 trigger are the large data throughput at 40\\,MHz and the need for a trigger decision within 12.5\\,$\\mu$s. To address these challenges, the CMS Outer Tracker for the HL-LHC uses modules with closely spaced silicon sensors to read out only hits compatible with charged particles above 2\\,GeV. 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