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="en" xml:lang="en" xmlns:og="http://ogp.me/ns#" xmlns:fb="http://ogp.me/ns/fb#"> <head> <title>ALICE Upgrades - 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/2915924" /> <link rel="alternate" hreflang="el" href="http://cds.cern.ch/record/2915924?ln=el" /> <link rel="alternate" hreflang="fr" href="http://cds.cern.ch/record/2915924?ln=fr" /> <link rel="alternate" hreflang="bg" href="http://cds.cern.ch/record/2915924?ln=bg" /> <link rel="alternate" hreflang="zh-TW" href="http://cds.cern.ch/record/2915924?ln=zh_TW" /> <link rel="alternate" hreflang="pt" href="http://cds.cern.ch/record/2915924?ln=pt" /> <link rel="alternate" hreflang="no" href="http://cds.cern.ch/record/2915924?ln=no" /> <link rel="alternate" hreflang="hr" href="http://cds.cern.ch/record/2915924?ln=hr" /> <link rel="alternate" hreflang="ca" href="http://cds.cern.ch/record/2915924?ln=ca" /> <link rel="alternate" hreflang="de" href="http://cds.cern.ch/record/2915924?ln=de" /> <link rel="alternate" hreflang="it" href="http://cds.cern.ch/record/2915924?ln=it" /> <link rel="alternate" hreflang="zh-CN" href="http://cds.cern.ch/record/2915924?ln=zh_CN" /> <link rel="alternate" hreflang="sv" href="http://cds.cern.ch/record/2915924?ln=sv" /> <link rel="alternate" hreflang="sk" href="http://cds.cern.ch/record/2915924?ln=sk" /> <link rel="alternate" hreflang="en" href="http://cds.cern.ch/record/2915924?ln=en" /> <link rel="alternate" hreflang="pl" href="http://cds.cern.ch/record/2915924?ln=pl" /> <link rel="alternate" hreflang="ru" href="http://cds.cern.ch/record/2915924?ln=ru" /> <link rel="alternate" hreflang="ka" href="http://cds.cern.ch/record/2915924?ln=ka" /> <link rel="alternate" hreflang="ja" href="http://cds.cern.ch/record/2915924?ln=ja" /> <link rel="alternate" hreflang="es" href="http://cds.cern.ch/record/2915924?ln=es" /> <link rel="alternate" type="application/rss+xml" title="CERN Document Server RSS" href="/rss?ln=en" /> <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="en" /> <meta name="description" content="The ALICE collaboration prepares multiple upgrades to further extend the reach of heavy-ion physics at the LHC. For LHC Run 4 (2030-2033), a Forward Calorimeter (FoCal) system combines a high-granularity electromagnetic silicon-tungsten calorimeter with a conventional hadronic calorimeter leading to an excellent two-shower separation for neutral pion reconstruction and photon isolation. Direct photon measurements with FoCal will uniquely constrain the low-x gluon structure of protons and nuclei via forward measurements of direct photons. Additionally, ALICE will employ bent, wafer-scale pixel sensors achieving truly cylindrical tracking layers with very low material budget. These layers will replace the three innermost layers of the Inner Tracking System resulting in an improvement in pointing resolution allowing new measurements of heavy-flavour hadrons and dielectrons. For Run 5 and beyond, a next-generation detector system, ALICE 3, has been conceived to gain unique access to the interaction and thermalization of heavy flavour probes in the QGP as well as to the thermal radiation carrying information about the temperature and the restoration of chiral symmetry. At its core, it combines a high-resolution vertex detector with a large-acceptance silicon pixel tracker. For the identification of particles, a combination of a time-of-flight system, a ring-imaging Cherenkov detector, an electromagnetic calorimeter, a muon identifier, and a dedicated forward detector for ultra-soft photons, are envisaged. Reidt, Felix" /> <meta name="keywords" content="CERN Document Server, WebSearch, ALICE Preprints" /> <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="arXiv : ALICE Upgrades" name="citation_title" /> <meta content="Reidt, Felix" name="citation_author" /> <meta content="2024/10/29" name="citation_publication_date" /> <meta name="citation_online_date" content="2024/11/01"> <meta content="arXiv:2410.22215" name="citation_technical_report_number" /> <meta name="citation_pdf_url" content="http://cds.cern.ch/record/2915924/files/2410.22215.pdf" />  <meta content="ALICE Upgrades" property="og:title" /> <meta content="arXiv" property="og:title" /> <meta content="website" property="og:type" /> <meta content="website" property="og:type" /> <meta content="http://cds.cern.ch/record/2915924" property="og:url" /> <meta name="twitter:image" content="http://cds.cern.ch/record/2915924/files/ITS3_material_vsphi.png" /> <meta property="og:image" content="http://cds.cern.ch/record/2915924/files/FIG_SENSOR_DIMENSIONS_4_illustrations.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2915924/files/FIG_SENSOR_DIMENSIONS_4_illustrations.png" /> <meta property="og:image" content="http://cds.cern.ch/record/2915924/files/ITS3_material_vsphi.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2915924/files/ITS3_material_vsphi.png" /> <meta property="og:image" content="http://cds.cern.ch/record/2915924/files/LambdaB.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2915924/files/LambdaB.png" /> <meta property="og:image" content="http://cds.cern.ch/record/2915924/files/reso_margin.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2915924/files/reso_margin.png" /> <meta property="og:image" content="http://cds.cern.ch/record/2915924/files/Segmentation.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2915924/files/Segmentation.png" /> <meta property="og:image" content="http://cds.cern.ch/record/2915924/files/Bs_R_AA.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2915924/files/Bs_R_AA.png" /> <meta property="og:image" content="http://cds.cern.ch/record/2915924/files/Simplified_layout.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2915924/files/Simplified_layout.png" /> <meta property="og:image" content="http://cds.cern.ch/record/2915924/files/pad-long-shower-profile-all.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2915924/files/pad-long-shower-profile-all.png" /> <meta property="og:image" content="http://cds.cern.ch/record/2915924/files/MatBud_Layer0.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2915924/files/MatBud_Layer0.png" /> <meta property="og:image" content="http://cds.cern.ch/record/2915924/files/Focal.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2915924/files/Focal.png" /> <meta property="og:image" content="http://cds.cern.ch/record/2915924/files/chiralmixing_results_010.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2915924/files/chiralmixing_results_010.png" /> <meta property="og:image" content="http://cds.cern.ch/record/2915924/files/cnnnpdf30reweight_focal100_yscale1.00.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2915924/files/cnnnpdf30reweight_focal100_yscale1.00.png" /> <meta property="og:image" content="http://cds.cern.ch/record/2915924/files/ShowerProfile.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2915924/files/ShowerProfile.png" /> <meta property="og:image" content="http://cds.cern.ch/record/2915924/files/ALICE3sketch.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2915924/files/ALICE3sketch.png" /> <meta property="og:image" content="http://cds.cern.ch/record/2915924/files/RelativeMomentumResolution.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2915924/files/RelativeMomentumResolution.png" /> <meta property="og:image" content="http://cds.cern.ch/record/2915924/files/PointingResolution.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2915924/files/PointingResolution.png" /> <meta property="og:image" content="http://cds.cern.ch/record/2915924/files/RICHstudy.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2915924/files/RICHstudy.png" /> <meta property="og:image" content="http://cds.cern.ch/record/2915924/files/TOFstudy.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2915924/files/TOFstudy.png" /> <meta property="og:image" content="http://cds.cern.ch/record/2915924/files/LHCfuture_pointingVSaccXratePb.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2915924/files/LHCfuture_pointingVSaccXratePb.png" /> <meta property="og:image" content="http://cds.cern.ch/record/2915924/files/Radii.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2915924/files/Radii.png" /> <meta property="og:image" content="http://cds.cern.ch/record/2915924/files/multi-charm-future.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2915924/files/multi-charm-future.png" /> <meta content="CERN Document Server" property="og:site_name" /> <meta content="arXiv" property="og:description" /> <meta content="The ALICE collaboration prepares multiple upgrades to further extend the reach of heavy-ion physics at the LHC. For LHC Run 4 (2030-2033), a Forward Calorimeter (FoCal) system combines a high-granularity electromagnetic silicon-tungsten calorimeter with a conventional hadronic calorimeter leading to an excellent two-shower separation for neutral pion reconstruction and photon isolation. Direct photon measurements with FoCal will uniquely constrain the low-x gluon structure of protons and nuclei via forward measurements of direct photons. Additionally, ALICE will employ bent, wafer-scale pixel sensors achieving truly cylindrical tracking layers with very low material budget. These layers will replace the three innermost layers of the Inner Tracking System resulting in an improvement in pointing resolution allowing new measurements of heavy-flavour hadrons and dielectrons. For Run 5 and beyond, a next-generation detector system, ALICE 3, has been conceived to gain unique access to the interaction and thermalization of heavy flavour probes in the QGP as well as to the thermal radiation carrying information about the temperature and the restoration of chiral symmetry. At its core, it combines a high-resolution vertex detector with a large-acceptance silicon pixel tracker. For the identification of particles, a combination of a time-of-flight system, a ring-imaging Cherenkov detector, an electromagnetic calorimeter, a muon identifier, and a dedicated forward detector for ultra-soft photons, are envisaged." property="og:description" />  <meta content="summary" name="twitter:card" /> <meta content="summary" name="twitter:card" /> <style></style> </head> <body class="ALICE32Preprints 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=http%3A//cds.cern.ch/record/2915924%3Fln%3Den" 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=en">Search</a></li> <li class="menu-444 "><a class="" title="" href="http://cds.cern.ch/submit?ln=en">Submit</a></li> <li class="menu-426 "><a class="" href="http://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/CERN%20Experiments?ln=en" class="navtrail">CERN Experiments</a> > <a href="/collection/LHC%20Experiments?ln=en" class="navtrail">LHC Experiments</a> > <a href="/collection/ALICE?ln=en" class="navtrail">ALICE</a> > <a href="/collection/ALICE%20Preprints?ln=en" class="navtrail">ALICE Preprints</a> > ALICE Upgrades </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/2915924/?ln=en">Information </a></li><li class=""><a href="/record/2915924/comments?ln=en">Discussion (0) </a></li><li class=""><a href="/record/2915924/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="2915924"></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">  Preprint </td> </tr> <tr><td class="formatRecordLabel"> Report number </td><td style="padding-left:5px;"><a href="http://arxiv.org/abs/arXiv:2410.22215">arXiv:2410.22215</a></td></tr> <tr><td class="formatRecordLabel"> Title </td><td style="padding-left:5px;"><b>ALICE Upgrades</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="http://cds.cern.ch/search?f=author&p=Reidt%2C%20Felix&ln=en">Reidt, Felix</a> (CERN)</td></tr> <tr><td class="formatRecordLabel"> Collaboration </td><td style="padding-left:5px;">ALICE 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 = '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;">2024-10-29</td></tr> <tr><td class="formatRecordLabel"> Number of pages </td><td style="padding-left:5px;">11</td></tr>  <tr><td class="formatRecordLabel"> Note </td><td style="padding-left:5px;">11 pages, 12 figures, LHCP 2024 (Boston, 3rd to 7th June 2024) conference proceedings</td></tr> <tr><td class="formatRecordLabel"> Subject category </td><td style="padding-left:5px;">nucl-ex ; Nuclear Physics - Experiment ; hep-ex ; Particle Physics - Experiment ; physics.ins-det ; Detectors and Experimental Techniques</td></tr> <tr><td class="formatRecordLabel"> Accelerator/Facility, Experiment </td><td style="padding-left:5px;"><a href="http://cds.cern.ch/search?p=CERN%20LHC&f=693__a">CERN LHC</a> ; <a href="http://cds.cern.ch/search?p=ALICE&f=693__e">ALICE</a></td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">The ALICE collaboration prepares multiple upgrades to further extend the reach of heavy-ion physics at the LHC. For LHC Run 4 (2030-2033), a Forward Calorimeter (FoCal) system combines a high-granularity electromagnetic silicon-tungsten calorimeter with a conventional hadronic calorimeter leading to an excellent two-shower separation for neutral pion reconstruction and photon isolation. Direct photon measurements with FoCal will uniquely constrain the low-x gluon structure of protons and nuclei via forward measurements of direct photons. Additionally, ALICE will employ bent, wafer-scale pixel sensors achieving truly cylindrical tracking layers with very low material budget. These layers will replace the three innermost layers of the Inner Tracking System resulting in an improvement in pointing resolution allowing new measurements of heavy-flavour hadrons and dielectrons. For Run 5 and beyond, a next-generation detector system, ALICE 3, has been conceived to gain unique access to the interaction and thermalization of heavy flavour probes in the QGP as well as to the thermal radiation carrying information about the temperature and the restoration of chiral symmetry. At its core, it combines a high-resolution vertex detector with a large-acceptance silicon pixel tracker. For the identification of particles, a combination of a time-of-flight system, a ring-imaging Cherenkov detector, an electromagnetic calorimeter, a muon identifier, and a dedicated forward detector for ultra-soft photons, are envisaged.</td></tr> <tr><td class="formatRecordLabel"> Other source </td><td style="padding-left:5px;"><a href="http://inspirehep.net/record/2843448">Inspire</a></td></tr> <tr><td class="formatRecordLabel"> Copyright/License </td><td style="padding-left:5px;">preprint: (License: <a href="http://creativecommons.org/licenses/by/4.0/">CC BY 4.0</a>)</td></tr> </table> <br /><div style="max-width:1024px;margin:auto"><div style="overflow-x:auto;display:inline;width:100%;"><a href="/record/2915924/plots#0"><img style="vertical-align:middle;" src="http://cds.cern.ch/record/2915924/files/Focal.png" title=" \textbf{Left:} sketch of FoCal, dimensions given in millimetres; \textbf{right}: sketch of FoCal-E, showing 20 layers of \qty{3.5}{\milli\meter} of W plus Si sensors. There are 18 layers consisting of pad sensors ('LG') and two layers of pixel sensors in positions five and ten, both taken from~\cite{CERN-LHCC-2024-004}." width="200px"/></a> <a href="/record/2915924/plots#1"><img style="vertical-align:middle;" src="http://cds.cern.ch/record/2915924/files/Segmentation.png" title=" \textbf{Left:} sketch of FoCal, dimensions given in millimetres; \textbf{right}: sketch of FoCal-E, showing 20 layers of \qty{3.5}{\milli\meter} of W plus Si sensors. There are 18 layers consisting of pad sensors ('LG') and two layers of pixel sensors in positions five and ten, both taken from~\cite{CERN-LHCC-2024-004}." width="200px"/></a> <a href="/record/2915924/plots#2"><img style="vertical-align:middle;" src="http://cds.cern.ch/record/2915924/files/ShowerProfile.png" title=" Longitudinal (left) and transverse (right) profile of two showers originating from high-energy photons displaced by \qty{1}{cm} on the surface of FoCal-E. The energy deposits in the pad and pixel sensors are colour-coded in red and blue, respectively, taken from~\cite{CERN-LHCC-2024-004}." width="200px"/></a> <a href='/record/2915924/plots'>Show more plots</a></div></div><br /> <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" ? "less" : "more"); }); </script> <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"> Record created 2024-11-01, last modified 2024-11-11</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=en&p=recid%3A2915924&rm=wrd" class="moreinfo">Similar records</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">Fulltext:</small> <br /><a href="/record/2915924/files/2410.22215.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=en&recid=2915924">Add to personal basket</a></li> <li>Export as <a style="text-decoration:underline;font-weight:normal" href="/record/2915924/export/hx?ln=en">BibTeX</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2915924/export/hm?ln=en">MARC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2915924/export/xm?ln=en">MARCXML</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2915924/export/xd?ln=en">DC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2915924/export/xe?ln=en">EndNote</a>,  <a style="text-decoration:underline;font-weight:normal" href="/record/2915924/export/xn?ln=en">NLM</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2915924/export/xw?ln=en">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/2410.2221/add'); $('#bookmark_sciencewise').bookmark({sites: ['sciencewise']}); $('#bookmark').bookmark({ sites: ['facebook', 'twitter', 'linkedin', 'google_plusone'], icons: '/img/bookmarks.png', url: 'http://cds.cern.ch/record/2915924', addEmail: true, title: "ALICE Upgrades", description: "The ALICE collaboration prepares multiple upgrades to further extend the reach of heavy-ion physics at the LHC. For LHC Run 4 (2030-2033), a Forward Calorimeter (FoCal) system combines a high-granularity electromagnetic silicon-tungsten calorimeter with a conventional hadronic calorimeter leading to an excellent two-shower separation for neutral pion reconstruction and photon isolation. Direct photon measurements with FoCal will uniquely constrain the low-x gluon structure of protons and nuclei via forward measurements of direct photons. Additionally, ALICE will employ bent, wafer-scale pixel sensors achieving truly cylindrical tracking layers with very low material budget. These layers will replace the three innermost layers of the Inner Tracking System resulting in an improvement in pointing resolution allowing new measurements of heavy-flavour hadrons and dielectrons. For Run 5 and beyond, a next-generation detector system, ALICE 3, has been conceived to gain unique access to the interaction and thermalization of heavy flavour probes in the QGP as well as to the thermal radiation carrying information about the temperature and the restoration of chiral symmetry. At its core, it combines a high-resolution vertex detector with a large-acceptance silicon pixel tracker. For the identification of particles, a combination of a time-of-flight system, a ring-imaging Cherenkov detector, an electromagnetic calorimeter, a muon identifier, and a dedicated forward detector for ultra-soft photons, are envisaged." }); // ]]> </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=en">Search</a> :: <a class="footer" href="http://cds.cern.ch/submit?ln=en">Submit</a> :: <a class="footer" href="https://cds.cern.ch/youraccount/display?ln=en">Personalize</a> :: <a class="footer" href="http://cds.cern.ch/help/?ln=en">Help</a> :: <a class="footer" href="https://cern.service-now.com/service-portal?id=privacy_policy&se=CDS-Service" target="_blank">Privacy Notice</a> <br /> Powered by <a class="footer" href="http://invenio-software.org/">Invenio</a> <br /> Maintained by <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"> This site is also available in the following languages:<br /><a href="/record/2915924?ln=bg" class="langinfo">Български</a>  <a href="/record/2915924?ln=ca" class="langinfo">Català</a>  <a href="/record/2915924?ln=de" class="langinfo">Deutsch</a>  <a href="/record/2915924?ln=el" class="langinfo">Ελληνικά</a>  <span class="langinfo">English</span>  <a href="/record/2915924?ln=es" class="langinfo">Español</a>  <a href="/record/2915924?ln=fr" class="langinfo">Français</a>  <a href="/record/2915924?ln=hr" class="langinfo">Hrvatski</a>  <a href="/record/2915924?ln=it" class="langinfo">Italiano</a>  <a href="/record/2915924?ln=ja" class="langinfo">日本語</a>  <a href="/record/2915924?ln=ka" class="langinfo">ქართული</a>  <a href="/record/2915924?ln=no" class="langinfo">Norsk/Bokmål</a>  <a href="/record/2915924?ln=pl" class="langinfo">Polski</a>  <a href="/record/2915924?ln=pt" class="langinfo">Português</a>  <a href="/record/2915924?ln=ru" class="langinfo">Русский</a>  <a href="/record/2915924?ln=sk" class="langinfo">Slovensky</a>  <a href="/record/2915924?ln=sv" class="langinfo">Svenska</a>  <a href="/record/2915924?ln=zh_CN" class="langinfo">中文(简)</a>  <a href="/record/2915924?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>