Author: Woodley, M.
Paper Title Page
THP025 Linear Accelerator Design for the LCLS-II FEL Facility 743
 
  • P. Emma, J.C. Frisch, Z. Huang, H. Loos, A. Marinelli, T.J. Maxwell, Y. Nosochkov, T.O. Raubenheimer, L. Wang, J.J. Welch, M. Woodley
    SLAC, Menlo Park, California, USA
  • J. Qiang, M. Venturini
    LBNL, Berkeley, California, USA
  • A. Saini, N. Solyak
    Fermilab, Batavia, Illinois, USA
  
  Funding: Work supported by the Director, Office of Science, of the U.S. Department of Energy under Contract No. DE-AC02-76SF00515.
The LCLS-II is an FEL fa­cil­ity pro­posed in re­sponse to the July 2013 BESAC ad­vi­sory com­mit­tee, which rec­om­mended the con­struc­tion of a new FEL light source with a high-rep­e­ti­tion rate and a broad pho­ton en­ergy range from 0.2 keV to at least 5 keV. A new CW 4-GeV elec­tron linac is being de­signed to meet this need, using a su­per­con­duct­ing (SC) L-band (1.3 GHz) lin­ear ac­cel­er­a­tor ca­pa­ble of op­er­at­ing with a con­tin­u­ous bunch rep­e­ti­tion rate up to 1 MHz at ~16 MV/m. This new 700-m linac is to be built at SLAC in the ex­ist­ing tun­nel, mak­ing use of ex­ist­ing fa­cil­i­ties and pro­vid­ing two sep­a­rate FELs, pre­serv­ing the op­er­a­tion of the ex­ist­ing FEL, which can be fed from ei­ther the ex­ist­ing cop­per or the new SC linac. We briefly de­scribe the ac­cel­er­a­tion, bunch com­pres­sion, beam trans­port, beam switch­ing, and elec­tron beam di­ag­nos­tics. The high-power and low-level RF, and cryo­genic sys­tems are de­scribed else­where. 		 
poster icon Poster THP025 [0.627 MB]  
 
THP029 MOGA OPTIMIZATION DESIGN OF LCLS-II LINAC CONFIGURATIONS 763
 
  • L. Wang, P. Emma, Y. Nosochkov, T.O. Raubenheimer, M. Woodley, F. Zhou
    SLAC, Menlo Park, California, USA
  • C. F. Papadopoulos, J. Qiang, M. Venturini
    LBNL, Berkeley, California, USA
  
  The Linac Co­her­ent Light Source II (LCLS-II) will gen­er­ate ex­tremely in­tense X-ray flashes to be used by re­searchers from all over the world. The FEL is pow­ered by 4 GeV su­per­con­duct­ing lin­ear ac­cel­er­a­tor, op­er­at­ing with a 1 MHz bunch rep­e­ti­tion rate. LCLS-II will pro­vide large flex­i­bil­ity in bunch charge and peak cur­rent. Multi-Ob­jec­tive Ge­netic Al­go­rithm (MOGA) is ap­plied to op­ti­mize the ma­chine pa­ra­me­ters in­clud­ing bunch com­pres­sors sys­tem, lin­earizer, de-chirper, RF phase and laser heater, in order to min­i­mize the en­ergy spread, col­lec­tive ef­fects and emit­tance. The strong re­sis­tive wall wake field along the 2km by­pass beam line acts as a nat­ural de-chirper. This paper sum­ma­rizes the op­ti­miza­tion of var­i­ous con­fig­u­ra­tions.  
poster icon Poster THP029 [0.702 MB]