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Full Simulation, is a precise tool based on Geant4 detector simulation. The other tool, Fast Simulation, provides a faster but still reliable tool and is based on parametric particle-material interactions. Full Simulation for the LHC Run-3 has shown significant computing performance improvements compared to LHC Run-2. The challenging CMS detector upgrade plan for HL (High Luminosity)-LHC requires extra efforts due to the increased luminosity and a new and more complex detector geometry. Full Simulation plans to meet the requirements for HL-LHC, which includes continuous migration to newer versions of Geant4 as well as further physics improvements. In Fast Simulation, a more efficient treatment of the generator particles during their propagation through the detectors was achieved. The increasing use of machine learning (ML) techniques in simulation leads to an enhanced description of physics processes and detector responses, which reduces the need for computing capacity. This contribution reports the current Full and Fast Simulation performance innovations and developments to fulfill the significant higher Monte Carlo Simulation demands for HL-LHC. ML software tools already in use and new developments for Full and Fast Simulation and other promising simulation tools such as FlashSim are introduced. Krammer, Natascha" /> <meta name="keywords" content="General" /> <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="The challenges of the HL-LHC for the Full and Fast Simulation of the CMS Experiment" name="citation_title" /> <meta content="Krammer, Natascha" name="citation_author" /> <meta content="2024/10/27" name="citation_publication_date" /> <meta name="citation_online_date" content="2025/02/17"> <meta content="CMS-CR-2024-283" name="citation_technical_report_number" /> <meta name="citation_pdf_url" content="https://cds.cern.ch/record/2924486/files/CR2024_283.pdf" />  <meta content="The challenges of the HL-LHC for the Full and Fast Simulation of the CMS Experiment" 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/2924486" property="og:url" /> <meta content="CERN Document Server" property="og:site_name" /> <meta content="Monte Carlo Simulation data for the CMS experiment are produced using two different software chains. Full Simulation, is a precise tool based on Geant4 detector simulation. The other tool, Fast Simulation, provides a faster but still reliable tool and is based on parametric particle-material interactions. Full Simulation for the LHC Run-3 has shown significant computing performance improvements compared to LHC Run-2. The challenging CMS detector upgrade plan for HL (High Luminosity)-LHC requires extra efforts due to the increased luminosity and a new and more complex detector geometry. Full Simulation plans to meet the requirements for HL-LHC, which includes continuous migration to newer versions of Geant4 as well as further physics improvements. In Fast Simulation, a more efficient treatment of the generator particles during their propagation through the detectors was achieved. The increasing use of machine learning (ML) techniques in simulation leads to an enhanced description of physics processes and detector responses, which reduces the need for computing capacity. This contribution reports the current Full and Fast Simulation performance innovations and developments to fulfill the significant higher Monte Carlo Simulation demands for HL-LHC. ML software tools already in use and new developments for Full and Fast Simulation and other promising simulation tools such as FlashSim are introduced." property="og:description" />  <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">  <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/2924486" 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=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>  <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> > The challenges of the HL-LHC for the Full and Fast Simulation of the CMS Experiment </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/2924486/?ln=en">Information </a></li><li class=""><a href="/record/2924486/references?ln=en">References </a></li><li class=""><a href="/record/2924486/comments?ln=en">Discussion (0) </a></li><li class=""><a href="/record/2924486/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">  <abbr class="unapi-id" title="2924486"></abbr>  <link href="/img/download_and_embed_buttons.css" rel="stylesheet" type="text/css" /> <style type="text/css">  .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">  CMS Note </td> </tr> <tr><td class="formatRecordLabel"> Report number </td><td style="padding-left:5px;">CMS-CR-2024-283</td></tr> <tr><td class="formatRecordLabel"> Title </td><td style="padding-left:5px;"><b>The challenges of the HL-LHC for the Full and Fast Simulation of the CMS Experiment</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=Krammer%2C%20Natascha&ln=en">Krammer, Natascha</a> (Vienna, OAW)</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>  <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;">27 Oct 2024</td></tr> <tr><td class="formatRecordLabel"> Number of pages </td><td style="padding-left:5px;">6</td></tr>  <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=General&ln=en">General</a></td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">Monte Carlo Simulation data for the CMS experiment are produced using two different software chains. Full Simulation, is a precise tool based on Geant4 detector simulation. The other tool, Fast Simulation, provides a faster but still reliable tool and is based on parametric particle-material interactions. Full Simulation for the LHC Run-3 has shown significant computing performance improvements compared to LHC Run-2. The challenging CMS detector upgrade plan for HL (High Luminosity)-LHC requires extra efforts due to the increased luminosity and a new and more complex detector geometry. Full Simulation plans to meet the requirements for HL-LHC, which includes continuous migration to newer versions of Geant4 as well as further physics improvements. In Fast Simulation, a more efficient treatment of the generator particles during their propagation through the detectors was achieved. The increasing use of machine learning (ML) techniques in simulation leads to an enhanced description of physics processes and detector responses, which reduces the need for computing capacity. This contribution reports the current Full and Fast Simulation performance innovations and developments to fulfill the significant higher Monte Carlo Simulation demands for HL-LHC. ML software tools already in use and new developments for Full and Fast Simulation and other promising simulation tools such as FlashSim are introduced.</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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