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The MAD-NG code was used to simultaneously optimise the main octupolar resonances: 4Qx, 4Qy, and 2Qx-2Qy by adjusting 16 quadrupole families and 16 octupole families, for a total of 32 parameters. These knobs were introduced as parameters in the transfer map, allowing the Jacobian required by the optimiser to be calculated in a single pass, saving 32 additional optics evaluations and avoiding finite difference approximations. Constraints on tunes, amplitude detuning and optics around the machine were also considered as part of the optimisation process. This paper reviews the parametric optimisation with MAD-NG and compares the results with MADX-PTC. 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var affiliation = $(this).data('affiliation') + '</br>'; var contribution = $(this).data('contribution') + '</br>'; $.magnificPopup.open({ items: { src: '<div id="ovelary-mathjax" class="overlay-white oc-content overlay-white-500">' + author + affiliation + contribution + '</div>', type: 'inline' }, callbacks: { open: function() { var div = document.getElementById("overlay-mathjax") MathJax.Hub.Queue(["Typeset", MathJax.Hub, div]); }, } }) }) }); </script> <tr><td class="formatRecordLabel"> Title </td><td style="padding-left:5px;"><b>Optimizing Resonance Driving Terms Using MAD-NG Parametric Maps</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=Deniau%2C%20Laurent&ln=ca">Deniau, Laurent</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Kostoglou%2C%20Sofia&ln=ca">Kostoglou, Sofia</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Maclean%2C%20Ewen&ln=ca">Maclean, Ewen</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Paraschou%2C%20Konstantinos&ln=ca">Paraschou, Konstantinos</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Persson%2C%20Tobias&ln=ca">Persson, Tobias</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Tom%C3%A1s%20Garc%C3%ADa%2C%20Rogelio&ln=ca">Tomás García, Rogelio</a> (CERN)</td></tr> <tr><td class="formatRecordLabel"> Publication </td><td style="padding-left:5px;">2024</td></tr> <tr><td class="formatRecordLabel"> Number of pages </td><td style="padding-left:5px;">4</td></tr> <tr><td class="formatRecordLabel"> In: </td><td style="padding-left:5px;"><a href="http://dx.doi.org/10.18429/JACoW-HB2023-THBP15"><i>JACoW HB</i> 2023 (2024) 483-486</a> </a></td></tr> <tr><td class="formatRecordLabel"> In: </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/record/2895374">68th ICFA Advanced Beam Dynamics workshop on high-Intensity and High-Brightness Hadron Beams (HB 2023)</a>, CERN, Geneva, Switzerland, 9 - 13 Oct 2023, pp.483-486</td></tr> <tr><td class="formatRecordLabel"> DOI </td><td style="padding-left:5px;"><a href="http://dx.doi.org/10.18429/JACoW-HB2023-THBP15" title="DOI" target="_blank">10.18429/JACoW-HB2023-THBP15</a> <tr><td class="formatRecordLabel"> Subject category </td><td style="padding-left:5px;">Accelerators and Storage Rings</td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">In 2023, a review of the LHC octupolar resonance driving terms at injection was carried out, motivated by two observations: (i) unwanted losses during the injection process with strongly powered octupoles and (ii) an expected reduction in emittance growth from e-cloud effects in simulations with weaker octupolar resonances. The MAD-NG code was used to simultaneously optimise the main octupolar resonances: 4Qx, 4Qy, and 2Qx-2Qy by adjusting 16 quadrupole families and 16 octupole families, for a total of 32 parameters. These knobs were introduced as parameters in the transfer map, allowing the Jacobian required by the optimiser to be calculated in a single pass, saving 32 additional optics evaluations and avoiding finite difference approximations. Constraints on tunes, amplitude detuning and optics around the machine were also considered as part of the optimisation process. This paper reviews the parametric optimisation with MAD-NG and compares the results with MADX-PTC.</td></tr> <tr><td class="formatRecordLabel"> Copyright/License </td><td style="padding-left:5px;">© 2024-2025 the author(s) (License: <a href="https://creativecommons.org/licenses/by/3.0">CC-BY-3.0</a>)</td></tr> </table> <br/>Corresponding record in: <a href="http://inspirehep.net/record/2776102">Inspire</a> <small> </small> <br/> <br/><br/><div align="right"><div style="padding-bottom:2px;padding-top:30px;"><span class="moreinfo" style="margin-right:10px;"> <a href="" class="moreinfo">Torna a la cerca</a> </span></div></div> <div class="bottom-left-folded"><div class="recordlastmodifiedbox" style="position:relative;margin-left:1px"> Registre creat el 2024-06-15, darrera modificació el 2024-06-15</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=ca&p=recid%3A2900919&rm=wrd" class="moreinfo">Registres semblants</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">Text complet:</small> <br /><a href="/record/2900919/files/document.pdf"><img style="border:none" src="/img/file-icon-text-34x48.gif" alt="Descarregar el text complet" /><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=ca&recid=2900919">Afegeix-lo al cistell personal</a></li> <li>Anomena i desa <a style="text-decoration:underline;font-weight:normal" href="/record/2900919/export/hx?ln=ca">BibTeX</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2900919/export/hm?ln=ca">MARC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2900919/export/xm?ln=ca">MARCXML</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2900919/export/xd?ln=ca">DC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2900919/export/xe?ln=ca">EndNote</a>,  <a style="text-decoration:underline;font-weight:normal" href="/record/2900919/export/xn?ln=ca">NLM</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2900919/export/xw?ln=ca">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:2900919/add'); $('#bookmark_sciencewise').bookmark({sites: ['sciencewise']}); $('#bookmark').bookmark({ sites: ['facebook', 'twitter', 'linkedin', 'google_plusone'], icons: '/img/bookmarks.png', url: 'https://cds.cern.ch/record/2900919', addEmail: true, title: "Optimizing Resonance Driving Terms Using MAD-NG Parametric Maps", description: "In 2023, a review of the LHC octupolar resonance driving terms at injection was carried out, motivated by two observations: (i) unwanted losses during the injection process with strongly powered octupoles and (ii) an expected reduction in emittance growth from e-cloud effects in simulations with weaker octupolar resonances. 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