Author: Spampinati, S.
Paper Title Page
WEP2PT008 Microbunching Instability Study in the Linac-Driven FERMI FEL Spreader Beam Line 108
 
  • S. Di Mitri, S. Spampinati
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
 
  Sup­pres­sion of mi­crobunch­ing in­sta­bil­ity (MBI) along high bright­ness elec­tron beam de­liv­ery sys­tems is a pri­or­ity for Free Elec­tron lasers (FELs) aim­ing at very nar­row band­width. The im­pact of MBI on FEL spec­tral bril­liance is ag­gra­vated by the grow­ing de­mand for multi-user FEL fa­cil­i­ties, which adopt multi-bend switch­yard lines tra­versed by high charge den­sity elec­tron beams. This study pro­vides prac­ti­cal guide­lines to switch­yards de­sign largely im­mune to MBI, by fo­cus­ing on the FERMI FEL Spreader line. First, two MBI an­a­lyt­i­cal mod­els [1, 2] are suc­cess­fully bench­marked along the ac­cel­er­a­tor. Being the sec­ond model flex­i­ble enough to de­scribe an ar­bi­trary multi-bend line, and found it in agree­ment with par­ti­cle track­ing and ex­per­i­men­tal re­sults, it was used to demon­strate that a newly pro­posed Spreader op­tics pro­vides uni­tary MBI gain while pre­serv­ing the elec­tron beam bright­ness.
[1] Z. Huang and K.-J. Kim, Phys. Rev. Special Topics - Accel. Beams 5, 074401 (2002)
[2] R.A. Bosch, K.J. Kleman, and J. Wu, Phys. Rev. Special Topics - Accel. Beams 11, 090702 (2008)
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-WEP2PT008  
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