<?xml version="1.0" encoding="UTF-8"?> <articles> <article xmlns:xlink="http://www.w3.org/1999/xlink/"> <front> <journal-meta> <journal-title>JACoW ICALEPCS</journal-title> <abbrev-journal-title>JACoW ICALEPCS</abbrev-journal-title> <issn/> </journal-meta> <article-meta> <title-group> <article-title>Operational Tool for Automatic Setup of Controlled Longitudinal Emittance Blow-Up in the CERN SPS</article-title> </title-group> <contrib-group> <contrib contrib-type="author"> <name> <surname>Bruchon</surname> <given-names>Niky</given-names> </name> <aff> <institution>CERN</institution> </aff> </contrib> <contrib contrib-type="author"> <name> <surname>Karpov</surname> <given-names>Ivan</given-names> </name> <aff> <institution>CERN</institution> </aff> </contrib> <contrib contrib-type="author"> <name> <surname>Madysa</surname> <given-names>Nico</given-names> </name> <aff> <institution>CERN</institution> </aff> <aff> <institution>Darmstadt, GSI</institution> </aff> </contrib> <contrib contrib-type="author"> <name> <surname>Papotti</surname> <given-names>Giulia</given-names> </name> <aff> <institution>CERN</institution> </aff> </contrib> <contrib contrib-type="author"> <name> <surname>Quartullo</surname> <given-names>Danilo</given-names> </name> <aff> <institution>CERN</institution> </aff> </contrib> </contrib-group> <pub-date pub-type="pub"> <year>2023</year> </pub-date> <volume>2023</volume> <fpage/> <lpage/> <self-uri xlink:href="http://cds.cern.ch/record/2896172"/> <self-uri xlink:href="http://cds.cern.ch/record/2896172/files/document.pdf"/> </article-meta> <abstract>The controlled longitudinal emittance blow-up is necessary to ensure the stability of high-intensity LHC-type beams in the CERN SPS. It consists of diffusing the particles in the bunch core by injecting a bandwidth-limited noise into the beam phase loop of the main 200 MHz RF system. Obtaining the correct amplitude and bandwidth of this noise signal is non-trivial, and it may be tedious and time-demanding if done manually. An automatic approach was developed to speed up the determination of optimal settings. The problem complexity is reduced by splitting the blow-up into multiple sub-intervals for which the noise parameters are optimized by observing the longitudinal profiles at the end of each sub-interval. The derived bunch lengths are used to determine the objective function which measures the error with respect to the requirements. The sub-intervals are tackled sequentially. The optimization moves to the next one only when the previous sub-interval is completed. The proposed tool is integrated into the CERN generic optimization framework that features pre-implemented optimization algorithms. Both single- and multi-bunch high-intensity beams are quickly and efficiently stabilized by the optimizer, used so far in high-intensity studies. A possible extension to Bayesian optimization is being investigated.</abstract> </front> <article-type>research-article</article-type> <ref/> </article> </articles>