Author: Senes, E.
Paper Title Page
MO3I02
 Dielectric Pick-Up for Short Bunches  
 
  • E. Senes, T. Lefèvre
    CERN, Meyrin, Switzerland
  
  Novel ac­cel­er­a­tion schemes pose new chal­lenges to the beam in­stru­men­ta­tion re­quired. This con­tri­bu­tion pre­sents a novel de­vice to mea­sure the beam po­si­tion, en­abling the dis­crim­i­na­tion of dif­fer­ent co-prop­a­gat­ing beams. The method lever­ages the char­ac­ter­is­tic prop­er­ties of the Co­her­ent Cherenkov-Dif­frac­tion Ra­di­a­tion (ChDR) emit­ted from di­elec­tric in­serts in the beampipe. The beam dis­crim­i­na­tion is per­formed in the fre­quency do­main, ex­ploit­ing the bunch length dif­fer­ence of the two beams. This de­vice was de­vel­oped for the AWAKE ex­per­i­ment, where not only an elec­tron beam co-prop­a­gates with a more in­tense pro­ton beam, but also tra­di­tional pick­ups are im­pacted by the en­vi­ron­ment pol­luted with spu­ri­ous charges from the plasma. The elec­tron beam dis­crim­i­na­tion takes place in a nar­row band around 30 GHz. The over­all de­sign and re­sults from the AWAKE ex­per­i­ment are pre­sented. The util­i­sa­tion of co­her­ent ChDR to dis­tin­guish dif­fer­ent co-prop­a­gat­ing beams is a sub­stan­tial nov­elty in the field, push­ing the in­stru­ments ca­pa­bil­i­ties for novel ac­cel­er­at­ing tech­nolo­gies, such as plasma-based ac­cel­er­a­tors.  
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TUP022 Characterisation of Cherenkov Diffraction Radiation Using Electro-Optical Methods 226
 
  • A. Schlögelhofer, T. Lefèvre, S. Mazzoni, E. Senes
    CERN, Meyrin, Switzerland
  • L. Duvillaret
    KAPTEOS, Sainte-Helene-du-Lac, France
  • A. Schlögelhofer
    TU Vienna, Wien, Austria
  
  The prop­er­ties of Cherenkov dif­frac­tion ra­di­a­tion (ChDR) have been stud­ied ex­ten­sively dur­ing the re­cent years to be ex­ploited for non-in­va­sive beam di­ag­nos­tic de­vices for short bunches. The de­pen­dence of charge and the in­flu­ence of the bunch form fac­tor on the co­her­ent part of the ra­di­ated spec­trum have been demon­strated and stud­ied in the past. How­ever, the ac­tual field strength of co­her­ent ChDR as well as its study in time do­main need fur­ther in­ves­ti­ga­tion. In this con­tri­bu­tion we are using elec­tro-op­ti­cal tech­niques to in­ves­ti­gate and quan­tify these pa­ra­me­ters. The elec­tro-op­ti­cal read-out brings the ad­van­tage of high band­width ac­qui­si­tion and in­sen­si­tiv­ity to elec­tro­mag­netic in­ter­fer­ence, whereas at the same time a large frac­tion of the ac­qui­si­tion setup can be in­stalled and op­er­ated out­side of the ra­di­a­tion con­trolled areas. We will pre­sent ex­per­i­men­tal re­sults from the CLEAR fa­cil­ity at CERN as well as sim­u­la­tions of the peak field of the tem­po­ral pro­file of beam-gen­er­ated ChDR pulses.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP022  
About • Received ※ 05 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 11 September 2023 — Issue date ※ 13 September 2023
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TUP023 Application of a Camera Array for the Upgrade of the AWAKE Spectrometer 230
 
  • E. Senes, S. Mazzoni, M. Turner, G. Zevi Della Porta
    CERN, Meyrin, Switzerland
  • D.A. Cooke, F.E. Pannell, M. Wing
    UCL, London, United Kingdom
  
  The first run of the AWAKE ex­per­i­ment suc­cess­fully demon­strated the ac­cel­er­a­tion of an elec­tron beam in the plasma wake­fields of a rel­a­tivis­tic pro­ton beam. The planned sec­ond run will focus on the con­trol of the emit­tance  of ac­cel­er­ated elec­trons, re­quir­ing an up­grade of the  ex­ist­ing spec­trom­e­ter. Pre­lim­i­nary mea­sure­ments showed that this might be achieved by im­prov­ing the res­o­lu­tion of the scin­til­la­tor and with a new de­sign of the op­ti­cal sys­tem. This con­tri­bu­tion dis­cusses the ap­pli­ca­tion of a dig­i­tal cam­era array in close prox­im­ity of the spec­trom­e­ter scin­til­la­tor, to en­able the ac­cel­er­ated elec­tron beam emit­tance mea­sure­ment.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP023  
About • Received ※ 05 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 24 September 2023
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