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>Characterisation of the optics of the TT24 and P42 beamlines in the CERN SPS North Area - 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/2901465" /> <link rel="alternate" hreflang="el" href="https://cds.cern.ch/record/2901465?ln=el" /> <link rel="alternate" hreflang="fr" href="https://cds.cern.ch/record/2901465?ln=fr" /> <link rel="alternate" hreflang="bg" href="https://cds.cern.ch/record/2901465?ln=bg" /> <link rel="alternate" hreflang="zh-TW" href="https://cds.cern.ch/record/2901465?ln=zh_TW" /> <link rel="alternate" hreflang="pt" href="https://cds.cern.ch/record/2901465?ln=pt" /> <link rel="alternate" hreflang="no" href="https://cds.cern.ch/record/2901465?ln=no" /> <link rel="alternate" hreflang="hr" href="https://cds.cern.ch/record/2901465?ln=hr" /> <link rel="alternate" hreflang="ca" href="https://cds.cern.ch/record/2901465?ln=ca" /> <link rel="alternate" hreflang="de" href="https://cds.cern.ch/record/2901465?ln=de" /> <link rel="alternate" hreflang="it" href="https://cds.cern.ch/record/2901465?ln=it" /> <link rel="alternate" hreflang="zh-CN" href="https://cds.cern.ch/record/2901465?ln=zh_CN" /> <link rel="alternate" hreflang="sv" href="https://cds.cern.ch/record/2901465?ln=sv" /> <link rel="alternate" hreflang="sk" href="https://cds.cern.ch/record/2901465?ln=sk" /> <link rel="alternate" hreflang="en" href="https://cds.cern.ch/record/2901465?ln=en" /> <link rel="alternate" hreflang="pl" href="https://cds.cern.ch/record/2901465?ln=pl" /> <link rel="alternate" hreflang="ru" href="https://cds.cern.ch/record/2901465?ln=ru" /> <link rel="alternate" hreflang="ka" href="https://cds.cern.ch/record/2901465?ln=ka" /> <link rel="alternate" hreflang="ja" href="https://cds.cern.ch/record/2901465?ln=ja" /> <link rel="alternate" hreflang="es" href="https://cds.cern.ch/record/2901465?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="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="en" /> <meta name="description" content="400 GeV protons extracted from the CERN SPS are transported to the T4 target via the TT20 transfer line. The P42 beamline then transports the protons that did not interact in the T4 target to the T10 target. During operation in 2021 and 2022, higher than expected beam losses were measured, in addition to the increased beam spot size that had previously been observed. It was previously suspected that the optics between TT24 and P42 might not be well matched but due to a lack of instrumentation this was not confirmed. The recent installation of additional beam profile monitors (BSG) in the P42 beamline has allowed the present optics to be evaluated for the first time. In addition, magnet response functions have been re-measured and updated. A kick response study was performed using corrector dipoles to kick the beam with the subsequent displacement measured on the BSGs. The dependence between the kick and the beam position was used to fit a MADX optics model of TT24 and P42. Quadrupole scans were then performed to determine the initial conditions of the model. These results are presented in this paper. Dyks, Luke Aidan; Banerjee, Dipanwita; Baratto Roldan, Anna; Bernhard, Johannes; Brugger, Markus; Charitonidis, Nikolaos; Fraser, Matthew Alexander; Gatignon, Lau; Goillot, Alice Marie; Gorn, Aleksandr; Jebramcik, Marc Andre; Metzger, Fabian; Murphy, Rob; Nevay, Laurence James; Parozzi, Elisabetta Giulia; Rae, Bastien; Schuh-Erhard, Silvia; Stummer, Florian Wolfgang; Van Dijk, Maarten; Velotti, Francesco Maria; Zickler, Thomas" /> <meta name="keywords" content="Physics Beyond Colliders" /> <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="Characterisation of the optics of the TT24 and P42 beamlines in the CERN SPS North Area" name="citation_title" /> <meta content="Dyks, Luke Aidan" name="citation_author" /> <meta content="Rae, Bastien" name="citation_author" /> <meta content="Bernhard, Johannes" name="citation_author" /> <meta content="Velotti, Francesco Maria" name="citation_author" /> <meta content="Parozzi, Elisabetta Giulia" name="citation_author" /> <meta content="Zickler, Thomas" name="citation_author" /> <meta content="Stummer, Florian Wolfgang" name="citation_author" /> <meta content="Jebramcik, Marc Andre" name="citation_author" /> <meta content="Schuh-Erhard, Silvia" name="citation_author" /> <meta content="Brugger, Markus" name="citation_author" /> <meta content="Nevay, Laurence James" name="citation_author" /> <meta content="Fraser, Matthew Alexander" name="citation_author" /> <meta content="Gatignon, Lau" name="citation_author" /> <meta content="Van Dijk, Maarten" name="citation_author" /> <meta content="Gorn, Aleksandr" name="citation_author" /> <meta content="Metzger, Fabian" name="citation_author" /> <meta content="Banerjee, Dipanwita" name="citation_author" /> <meta content="Baratto Roldan, Anna" name="citation_author" /> <meta content="Goillot, Alice Marie" name="citation_author" /> <meta content="Murphy, Rob" name="citation_author" /> <meta content="Charitonidis, Nikolaos" name="citation_author" /> <meta content="10.18429/JACoW-IPAC2024-TUPC74" name="citation_doi" /> <meta content="JACoW" name="citation_journal_title" /> <meta content="IPAC2024" name="citation_volume" /> <meta content="TUPC74" name="citation_firstpage" /> <meta content="2024/06/19" name="citation_publication_date" /> <meta name="citation_online_date" content="2024/06/19"> <meta content="CERN-PBC-CONF-2024-004" name="citation_technical_report_number" /> <meta content="10.18429/JACoW-IPAC2024-TUPC74" name="citation_doi" /> <meta name="citation_pdf_url" content="https://cds.cern.ch/record/2901465/files/TUPC74.pdf" />  <meta content="Characterisation of the optics of the TT24 and P42 beamlines in the CERN SPS North Area" property="og:title" /> <meta content="website" property="og:type" /> <meta content="website" property="og:type" /> <meta content="https://cds.cern.ch/record/2901465" property="og:url" /> <meta name="twitter:image" content="https://cds.cern.ch/record/2901465/files/TUPC74.jpg?subformat=icon-180" /> <meta property="og:image" content="https://cds.cern.ch/record/2901465/files/TUPC74.jpg?subformat=icon-180" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2901465/files/TUPC74.jpg?subformat=icon-180" /> <meta property="og:image" content="https://cds.cern.ch/record/2901465/files/TUPC74.gif?subformat=icon" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2901465/files/TUPC74.gif?subformat=icon" /> <meta property="og:image" content="https://cds.cern.ch/record/2901465/files/TUPC74.jpg?subformat=icon-180" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2901465/files/TUPC74.jpg?subformat=icon-180" /> <meta content="CERN Document Server" property="og:site_name" /> <meta content="400 GeV protons extracted from the CERN SPS are transported to the T4 target via the TT20 transfer line. The P42 beamline then transports the protons that did not interact in the T4 target to the T10 target. During operation in 2021 and 2022, higher than expected beam losses were measured, in addition to the increased beam spot size that had previously been observed. It was previously suspected that the optics between TT24 and P42 might not be well matched but due to a lack of instrumentation this was not confirmed. The recent installation of additional beam profile monitors (BSG) in the P42 beamline has allowed the present optics to be evaluated for the first time. In addition, magnet response functions have been re-measured and updated. A kick response study was performed using corrector dipoles to kick the beam with the subsequent displacement measured on the BSGs. The dependence between the kick and the beam position was used to fit a MADX optics model of TT24 and P42. Quadrupole scans were then performed to determine the initial conditions of the model. These results are presented in this paper." property="og:description" />  <meta content="summary" name="twitter:card" /> <meta content="summary" name="twitter:card" /> <style></style> </head> <body class="CERN32Document32Server 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/2901465%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="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> > Characterisation of the optics of the TT24 and P42 beamlines in the CERN SPS North Area </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/2901465/?ln=en">Information </a></li><li class=""><a href="/record/2901465/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="2901465"></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">  Article </td> </tr> <tr><td class="formatRecordLabel"> Report number </td><td style="padding-left:5px;">CERN-PBC-CONF-2024-004</td></tr> <tr><td class="formatRecordLabel"> Title </td><td style="padding-left:5px;"><b>Characterisation of the optics of the TT24 and P42 beamlines in the CERN SPS North Area</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;"> <script type="text/javascript"> function toggle_authors_visibility(){ var more = document.getElementById('more'); var link = document.getElementById('link'); var extension = document.getElementById('extension'); if (more.style.display=='none'){ more.style.display = ''; extension.style.display = 'none'; link.innerHTML = "Hide" } else { more.style.display = 'none'; extension.style.display = ''; link.innerHTML = "Show all 21 authors" } link.style.color = "rgb(204,0,0);" } function set_up(){ var extension = document.getElementById('extension'); extension.innerHTML = ""; toggle_authors_visibility(); } </script> <a name="show_hide" /><a href="https://cds.cern.ch/search?f=author&p=Dyks%2C%20Luke%20Aidan&ln=en">Dyks, Luke Aidan</a> (University of Oxford (GB)) ; <a href="https://cds.cern.ch/search?f=author&p=Banerjee%2C%20Dipanwita&ln=en">Banerjee, Dipanwita</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Baratto%20Roldan%2C%20Anna&ln=en">Baratto Roldan, Anna</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Bernhard%2C%20Johannes&ln=en">Bernhard, Johannes</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Brugger%2C%20Markus&ln=en">Brugger, Markus</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Charitonidis%2C%20Nikolaos&ln=en">Charitonidis, Nikolaos</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Fraser%2C%20Matthew%20Alexander&ln=en">Fraser, Matthew Alexander</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Gatignon%2C%20Lau&ln=en">Gatignon, Lau</a> (Lancaster University (GB)) ; <a href="https://cds.cern.ch/search?f=author&p=Goillot%2C%20Alice%20Marie&ln=en">Goillot, Alice Marie</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Gorn%2C%20Aleksandr&ln=en">Gorn, Aleksandr</a> (CERN)<span id="more" style=""> ; <a href="https://cds.cern.ch/search?f=author&p=Jebramcik%2C%20Marc%20Andre&ln=en">Jebramcik, Marc Andre</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Metzger%2C%20Fabian&ln=en">Metzger, Fabian</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Murphy%2C%20Rob&ln=en">Murphy, Rob</a> (University of London (GB)) ; <a href="https://cds.cern.ch/search?f=author&p=Nevay%2C%20Laurence%20James&ln=en">Nevay, Laurence James</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Parozzi%2C%20Elisabetta%20Giulia&ln=en">Parozzi, Elisabetta Giulia</a> (Universita & INFN, Milano-Bicocca (IT)) ; <a href="https://cds.cern.ch/search?f=author&p=Rae%2C%20Bastien&ln=en">Rae, Bastien</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Schuh-Erhard%2C%20Silvia&ln=en">Schuh-Erhard, Silvia</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Stummer%2C%20Florian%20Wolfgang&ln=en">Stummer, Florian Wolfgang</a> (University of London (GB)) ; <a href="https://cds.cern.ch/search?f=author&p=Van%20Dijk%2C%20Maarten&ln=en">Van Dijk, Maarten</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Velotti%2C%20Francesco%20Maria&ln=en">Velotti, Francesco Maria</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Zickler%2C%20Thomas&ln=en">Zickler, Thomas</a> (CERN)</span> <span id="extension"></span> <small><i><a id="link" href="#" onclick="toggle_authors_visibility()" style="color:rgb(204,0,0);"></a></i></small><script type="text/javascript">set_up()</script></td></tr> <tr><td class="formatRecordLabel"> Publication </td><td style="padding-left:5px;">2024</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 ; ARTICLE'; 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;">2024-06-19</td></tr> <tr><td class="formatRecordLabel"> Number of pages </td><td style="padding-left:5px;">4</td></tr>  <tr><td class="formatRecordLabel"> Published in: </td><td style="padding-left:5px;"><a href="http://dx.doi.org/10.18429/JACoW-IPAC2024-TUPC74"><i>JACoW</i> IPAC2024 (2023) TUPC74</a> </a></td></tr> <tr><td class="formatRecordLabel"> Presented at </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/search?f=111__g&p=nashville20240519">15th International Particle Accelerator Conference (IPAC 2024)</a></td></tr> <tr><td class="formatRecordLabel"> DOI </td><td style="padding-left:5px;"><a href="http://dx.doi.org/10.18429/JACoW-IPAC2024-TUPC74" title="DOI" target="_blank">10.18429/JACoW-IPAC2024-TUPC74</a> <tr><td class="formatRecordLabel"> Subject category </td><td style="padding-left:5px;">Accelerators and Storage Rings</td></tr> <tr><td class="formatRecordLabel"> Study </td><td style="padding-left:5px;"><a href='https://cds.cern.ch/search?p=693__s:"Physics Beyond Colliders"'>Physics Beyond Colliders</a></td></tr> <tr><td class="formatRecordLabel"> Project </td><td style="padding-left:5px;"><a href='https://cds.cern.ch/search?p=693__p:"Beam Dump Facility"'>Beam Dump Facility</a> ; <a href='https://cds.cern.ch/search?p=693__p:"Conventional Beams"'>Conventional Beams</a></td></tr> <tr><td class="formatRecordLabel"> Keywords </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/search?f=keyword&p=Physics%20Beyond%20Colliders&ln=en">Physics Beyond Colliders</a></td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">400 GeV protons extracted from the CERN SPS are transported to the T4 target via the TT20 transfer line. The P42 beamline then transports the protons that did not interact in the T4 target to the T10 target. During operation in 2021 and 2022, higher than expected beam losses were measured, in addition to the increased beam spot size that had previously been observed. It was previously suspected that the optics between TT24 and P42 might not be well matched but due to a lack of instrumentation this was not confirmed. The recent installation of additional beam profile monitors (BSG) in the P42 beamline has allowed the present optics to be evaluated for the first time. In addition, magnet response functions have been re-measured and updated. A kick response study was performed using corrector dipoles to kick the beam with the subsequent displacement measured on the BSGs. The dependence between the kick and the beam position was used to fit a MADX optics model of TT24 and P42. Quadrupole scans were then performed to determine the initial conditions of the model. These results are presented in this paper.</td></tr> <tr><td class="formatRecordLabel"> Other source </td><td style="padding-left:5px;"><a href="http://inspirehep.net/record/2813209">Inspire</a></td></tr> <tr><td class="formatRecordLabel"> Submitted by </td><td style="padding-left:5px;"><a href="mailto:johannes.bernhard@cern.ch">johannes.bernhard@cern.ch</a></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" ? "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 2024-06-19, last modified 2024-10-08</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%3A2901465&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/2901465/files/TUPC74.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=2901465">Add to personal basket</a></li> <li>Export as <a style="text-decoration:underline;font-weight:normal" href="/record/2901465/export/hx?ln=en">BibTeX</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2901465/export/hm?ln=en">MARC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2901465/export/xm?ln=en">MARCXML</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2901465/export/xd?ln=en">DC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2901465/export/xe?ln=en">EndNote</a>,  <a style="text-decoration:underline;font-weight:normal" href="/record/2901465/export/xn?ln=en">NLM</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2901465/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', 'https://cds.cern.ch/img/sciencewise.png', 'en', 'bookmark', 'http://sciencewise.info/bookmarks/cds:2901465/add'); $('#bookmark_sciencewise').bookmark({sites: ['sciencewise']}); $('#bookmark').bookmark({ sites: ['facebook', 'twitter', 'linkedin', 'google_plusone'], icons: '/img/bookmarks.png', url: 'https://cds.cern.ch/record/2901465', addEmail: true, title: "Characterisation of the optics of the TT24 and P42 beamlines in the CERN SPS North Area", description: "400 GeV protons extracted from the CERN SPS are transported to the T4 target via the TT20 transfer line. The P42 beamline then transports the protons that did not interact in the T4 target to the T10 target. During operation in 2021 and 2022, higher than expected beam losses were measured, in addition to the increased beam spot size that had previously been observed. It was previously suspected that the optics between TT24 and P42 might not be well matched but due to a lack of instrumentation this was not confirmed. The recent installation of additional beam profile monitors (BSG) in the P42 beamline has allowed the present optics to be evaluated for the first time. In addition, magnet response functions have been re-measured and updated. A kick response study was performed using corrector dipoles to kick the beam with the subsequent displacement measured on the BSGs. The dependence between the kick and the beam position was used to fit a MADX optics model of TT24 and P42. Quadrupole scans were then performed to determine the initial conditions of the model. These results are presented in this paper." }); // ]]> </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=en">Search</a> :: <a class="footer" href="https://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="https://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> :: <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 /> 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="https://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/2901465?ln=bg" class="langinfo">Български</a>  <a href="/record/2901465?ln=ca" class="langinfo">Català</a>  <a href="/record/2901465?ln=de" class="langinfo">Deutsch</a>  <a href="/record/2901465?ln=el" class="langinfo">Ελληνικά</a>  <span class="langinfo">English</span>  <a href="/record/2901465?ln=es" class="langinfo">Español</a>  <a href="/record/2901465?ln=fr" class="langinfo">Français</a>  <a href="/record/2901465?ln=hr" class="langinfo">Hrvatski</a>  <a href="/record/2901465?ln=it" class="langinfo">Italiano</a>  <a href="/record/2901465?ln=ja" class="langinfo">日本語</a>  <a href="/record/2901465?ln=ka" class="langinfo">ქართული</a>  <a href="/record/2901465?ln=no" class="langinfo">Norsk/Bokmål</a>  <a href="/record/2901465?ln=pl" class="langinfo">Polski</a>  <a href="/record/2901465?ln=pt" class="langinfo">Português</a>  <a href="/record/2901465?ln=ru" class="langinfo">Русский</a>  <a href="/record/2901465?ln=sk" class="langinfo">Slovensky</a>  <a href="/record/2901465?ln=sv" class="langinfo">Svenska</a>  <a href="/record/2901465?ln=zh_CN" class="langinfo">中文(简)</a>  <a href="/record/2901465?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>