Author: Patra, P.
Paper Title Page
TUPAB105 Simulation Studies for Dark Current Signature From DLS RF Gun 1630
 
  • J. Karmakar, M. Aggarwal, S. Ghosh, B. Karmakar, P. Patra, B.K. Sahu, A. Sharma
    IUAC, New Delhi, India
  
  The Delhi Light source (DLS) is an up­com­ing com­pact THz fa­cil­ity at IUAC, New Delhi, based on pre-bunched FEL. RF con­di­tion­ing of the 2.6 cell S-band RF gun is presently car­ried out with a Cu photo-cath­ode (PC) plug and dark cur­rent is pro­duced when sub­stan­tial ac­cel­er­at­ing field is reached in­side the cav­ity. To iden­tify the pos­si­ble field emis­sion sites con­tribut­ing to dark cur­rent, sin­gle elec­tron ASTRA sim­u­la­tions are done with a phase scan of the RF field. The sim­u­la­tion is ex­tended to in­clude multi-par­ti­cle emis­sion from the PC edge as a ring. The en­er­gies pre­sent in the dark cur­rent is analysed from the the Fowler Nord­heim cur­rent plot and en­ergy phase scan plot. The dis­tri­b­u­tion of few dark cur­rent en­er­gies and their re­spec­tive tra­jec­to­ries upto the YAG screen at a given so­le­noid set­ting is traced and shown in the sim­u­la­tions. We also pre­sent the dark cur­rent im­ages cap­tured dur­ing the ini­tial RF con­di­tion­ing and try to com­pare it with the sim­u­la­tions.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB105  
About • paper received ※ 19 May 2021       paper accepted ※ 17 August 2021       issue date ※ 01 September 2021  
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