Keyword: dipole
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TUPHA119 Online Coupling Measurement and Correction Throughout the LHC Cycle ion, coupling, software, operation 686
 
  • G.H. Hemelsoet, A. Calia, K. Fuchsberger, M. Gabriel, M. Hostettler, M. Hruska, D. Jacquet, T. Persson, M.E. Soderen, D. Valuch
    CERN, Geneva, Switzerland
  
  With high in­ten­sity beams, a pre­cise mea­sure­ment and ef­fec­tive cor­rec­tion of the be­ta­tron cou­pling is es­sen­tial for the per­for­mance of the Large Hadron Col­lider (LHC). In order to mea­sure this pa­ra­me­ter, the LHC trans­verse damper(ADT), used as an AC di­pole, will pro­vide the nec­es­sary beam ex­ci­ta­tion. The beam os­cil­la­tions will be recorded by the Beam Po­si­tions Mon­i­tors and trans­mit­ted to ded­i­cated analy­sis soft­ware. We set up the pro­ject with a 3-layer soft­ware ar­chi­tec­ture: The cen­tral node is a java server or­ches­trat­ing the dif­fer­ent ac­tors: The Graph­i­cal User In­ter­face, the con­trol and trig­ger­ing of the ADT AC di­pole, the BPMs, the os­cil­la­tion analy­sis (partly in python), and fi­nally the trans­mis­sion of the cor­rec­tion val­ues. The whole sys­tem, is cur­rently being de­vel­oped in a team using Scrum, an it­er­a­tive and in­cre­men­tal agile soft­ware de­vel­op­ment frame­work. In this paper we pre­sent an overview of this sys­tem, ex­pe­ri­ence from ma­chine de­vel­op­ment and com­mis­sion­ing as well as how scrum helped us to achieve our goals. Im­prove­ment and re-use of the ar­chi­tec­ture with a nice de­cou­pling be­tween data ac­qui­si­tion and data analy­sis are also briefly dis­cussed.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-TUPHA119  
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