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The CERN Linear Electron Accelerator for Research (CLEAR) is an irradiation facility that produces 200 MeV beams of electrons with parameters tuned to the needs of users. One of the most commonly requested beam parameters is for bunch lengths of less than 1 ps, which was not previously possible for high-charge bunches. In this thesis, the ability to compress high-charge bunches to sub-ps bunch lengths, using the velocity bunching technique, is shown in simulation. The simulations are then verified with experimental measurements taken at CLEAR. The ability to reduce the emittance of the beam during compression is also presented. Potential upgrades to the CLEAR facility are proposed, namely a new laser system and the installation of an additional klystron. The benefits of these upgrades are explored in simulation, demonstrating that they would allow the production of shorter bunches, with lower energy spread, and lower emittance. It is shown that by using a modified version of the CLEAR photoinjector it is possible to produce bunches with a uniform transverse profile using a simple Gaussian laser with a 1 ps pulse length. A compact irradiation facility was proposed consisting of the CLEAR photoinjector, an X-band linac using cavities similar to those developed for the Compact Linear Collider, and a quadrupole matching section. It was shown that such a facility could produce beams of different sizes with uniform beam profiles. The stability of such a facility was investigated, demonstrating that beam jitters do not significantly reduce beam uniformity. Dyks, Luke Aidan" /> <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="Studies for Upgrading and Optimising the CLEAR Beamline, and Generating Uniform Electron-Beam Profiles for Irradiation Experiments" name="citation_title" /> <meta content="Dyks, Luke Aidan" name="citation_author" /> <meta name="citation_online_date" content="2023/06/27"> <meta content="CERN-THESIS-2022-365" name="citation_technical_report_number" /> <meta content="Oxford U." name="citation_dissertation_institution" /> <meta name="citation_pdf_url" content="https://cds.cern.ch/record/2863106/files/CERN-THESIS-2022-365.pdf" />  <meta content="Studies for Upgrading and Optimising the CLEAR Beamline, and Generating Uniform Electron-Beam Profiles for Irradiation Experiments" property="og:title" /> <meta content="website" property="og:type" /> <meta content="https://cds.cern.ch/record/2863106" property="og:url" /> <meta content="CERN Document Server" property="og:site_name" /> <meta content="Irradiation facilities around the world are used to investigate the effect of high-energy particle beams on electronics, to study the makeup of historical objects and art, and for medical applications, notably radiotherapy. The CERN Linear Electron Accelerator for Research (CLEAR) is an irradiation facility that produces 200 MeV beams of electrons with parameters tuned to the needs of users. One of the most commonly requested beam parameters is for bunch lengths of less than 1 ps, which was not previously possible for high-charge bunches. In this thesis, the ability to compress high-charge bunches to sub-ps bunch lengths, using the velocity bunching technique, is shown in simulation. The simulations are then verified with experimental measurements taken at CLEAR. The ability to reduce the emittance of the beam during compression is also presented. Potential upgrades to the CLEAR facility are proposed, namely a new laser system and the installation of an additional klystron. The benefits of these upgrades are explored in simulation, demonstrating that they would allow the production of shorter bunches, with lower energy spread, and lower emittance. It is shown that by using a modified version of the CLEAR photoinjector it is possible to produce bunches with a uniform transverse profile using a simple Gaussian laser with a 1 ps pulse length. A compact irradiation facility was proposed consisting of the CLEAR photoinjector, an X-band linac using cavities similar to those developed for the Compact Linear Collider, and a quadrupole matching section. It was shown that such a facility could produce beams of different sizes with uniform beam profiles. The stability of such a facility was investigated, demonstrating that beam jitters do not significantly reduce beam uniformity." property="og:description" />  <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/2863106" 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> > Studies for Upgrading and Optimising the CLEAR Beamline, and Generating Uniform Electron-Beam Profiles for Irradiation Experiments </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/2863106/?ln=en">Information </a></li><li class=""><a href="/record/2863106/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="2863106"></abbr> <style type="text/css">  </style> <script type="text/javascript" src="/js/pdf-previewer-append-to-table.js"></script> <table class="formatRecordTableFullWidth" > <tr> <td class="formatRecordHeader" style="background-image: url('https://cds.cern.ch/img/journals.jpg');" colspan="2"> Thesis </td> </tr> <tr><td class="formatRecordLabel"> Report number </td><td style="padding-left:5px;">CERN-THESIS-2022-365</td></tr> <tr><td class="formatRecordLabel"> Title </td><td style="padding-left:5px;"><b>Studies for Upgrading and Optimising the CLEAR Beamline, and Generating Uniform Electron-Beam Profiles for Irradiation Experiments</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=Dyks%2C%20Luke%20Aidan&ln=en">Dyks, Luke Aidan</a> (Oxford U.)</td></tr> <tr><td class="formatRecordLabel"> Publication </td><td style="padding-left:5px;">170.</td></tr> <tr><td class="formatRecordLabel"> Thesis note </td><td style="padding-left:5px;">PhD : Oxford U. : 2022</td></tr> <tr><td class="formatRecordLabel"> Thesis supervisor(s) </td><td style="padding-left:5px;"><a href="/search?f=author&p=Corsini, Roberto">Corsini, Roberto</a> ; <a href="/search?f=author&p=Burrows, Philip">Burrows, Philip</a></td></tr> <tr><td class="formatRecordLabel"> Note </td><td style="padding-left:5px;">Presented 19 Aug 2022</td></tr> <tr><td class="formatRecordLabel"> Subject category </td><td style="padding-left:5px;">Accelerators and Storage Rings</td></tr> <tr><td class="formatRecordLabel"> Accelerator/Facility, Experiment </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/search?p=CERN%20Linac&f=693__a">CERN Linac</a><br/><a href="https://cds.cern.ch/search?p=CLIC&f=693__a">CLIC</a></td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">Irradiation facilities around the world are used to investigate the effect of high-energy particle beams on electronics, to study the makeup of historical objects and art, and for medical applications, notably radiotherapy. The CERN Linear Electron Accelerator for Research (CLEAR) is an irradiation facility that produces 200 MeV beams of electrons with parameters tuned to the needs of users. One of the most commonly requested beam parameters is for bunch lengths of less than 1 ps, which was not previously possible for high-charge bunches. In this thesis, the ability to compress high-charge bunches to sub-ps bunch lengths, using the velocity bunching technique, is shown in simulation. The simulations are then verified with experimental measurements taken at CLEAR. The ability to reduce the emittance of the beam during compression is also presented. Potential upgrades to the CLEAR facility are proposed, namely a new laser system and the installation of an additional klystron. The benefits of these upgrades are explored in simulation, demonstrating that they would allow the production of shorter bunches, with lower energy spread, and lower emittance. It is shown that by using a modified version of the CLEAR photoinjector it is possible to produce bunches with a uniform transverse profile using a simple Gaussian laser with a 1 ps pulse length. A compact irradiation facility was proposed consisting of the CLEAR photoinjector, an X-band linac using cavities similar to those developed for the Compact Linear Collider, and a quadrupole matching section. It was shown that such a facility could produce beams of different sizes with uniform beam profiles. The stability of such a facility was investigated, demonstrating that beam jitters do not significantly reduce beam uniformity.</td></tr> </table> <br/>Corresponding record in: <a href="http://inspirehep.net/record/2675454">Inspire</a> <br/>Email contact: <a href="mailto:sylvia.dubourg@cern.ch">sylvia.dubourg@cern.ch</a> <small> </small> <small> </small> <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 2023-06-27, last modified 2024-02-21</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%3A2863106&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/2863106/files/CERN-THESIS-2022-365.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=2863106">Add to personal basket</a></li> <li>Export as <a style="text-decoration:underline;font-weight:normal" href="/record/2863106/export/hx?ln=en">BibTeX</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2863106/export/hm?ln=en">MARC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2863106/export/xm?ln=en">MARCXML</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2863106/export/xd?ln=en">DC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2863106/export/xe?ln=en">EndNote</a>,  <a style="text-decoration:underline;font-weight:normal" href="/record/2863106/export/xn?ln=en">NLM</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2863106/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:2863106/add'); $('#bookmark_sciencewise').bookmark({sites: ['sciencewise']}); $('#bookmark').bookmark({ sites: ['facebook', 'twitter', 'linkedin', 'google_plusone'], icons: '/img/bookmarks.png', url: 'https://cds.cern.ch/record/2863106', addEmail: true, title: "Studies for Upgrading and Optimising the CLEAR Beamline, and Generating Uniform Electron-Beam Profiles for Irradiation Experiments", description: "Irradiation facilities around the world are used to investigate the effect of high-energy particle beams on electronics, to study the makeup of historical objects and art, and for medical applications, notably radiotherapy. The CERN Linear Electron Accelerator for Research (CLEAR) is an irradiation facility that produces 200 MeV beams of electrons with parameters tuned to the needs of users. One of the most commonly requested beam parameters is for bunch lengths of less than 1 ps, which was not previously possible for high-charge bunches. In this thesis, the ability to compress high-charge bunches to sub-ps bunch lengths, using the velocity bunching technique, is shown in simulation. The simulations are then verified with experimental measurements taken at CLEAR. The ability to reduce the emittance of the beam during compression is also presented. Potential upgrades to the CLEAR facility are proposed, namely a new laser system and the installation of an additional klystron. The benefits of these upgrades are explored in simulation, demonstrating that they would allow the production of shorter bunches, with lower energy spread, and lower emittance. It is shown that by using a modified version of the CLEAR photoinjector it is possible to produce bunches with a uniform transverse profile using a simple Gaussian laser with a 1 ps pulse length. A compact irradiation facility was proposed consisting of the CLEAR photoinjector, an X-band linac using cavities similar to those developed for the Compact Linear Collider, and a quadrupole matching section. It was shown that such a facility could produce beams of different sizes with uniform beam profiles. The stability of such a facility was investigated, demonstrating that beam jitters do not significantly reduce beam uniformity." }); // ]]> </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> <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? 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