Author: Gai, W.
Paper Title Page
FRB02 A Collinear Wakefield Accelerator for a High Repetition Rate Multi-beamline Soft X-ray FEL Facility 993
 
  • A. Zholents, W. Gai, R.R. Lindberg, J.G. Power, Y.-E. Sun
    ANL, Argonne, Ilinois, USA
  • C.-J. Jing, A. Kanareykin
    Euclid TechLabs, LLC, Solon, Ohio, USA
  • C. Li, C.-X. Tang
    TUB, Beijing, People's Republic of China
  • D.Y. Shchegolkov, E.I. Simakov
    LANL, Los Alamos, New Mexico, USA
 
  Funding: Supported by U.S. Department of Energy under Contract No. DE-AC02-06CH11357 and by the U.S. Department of Energy Laboratory LDRD program at Los Alamos National Laboratory.
A con­cept is pre­sented for a multi beam­line soft x-ray free-elec­tron laser (FEL) fa­cil­ity where sev­eral FEL un­du­la­tor lines are dri­ven by an equal num­ber of high rep­e­ti­tion rate sin­gle-stage collinear wake­field ac­cel­er­a­tors (CWA). A prac­ti­cal de­sign of the CWA, ex­tend­ing over 30 me­ters and em­bed­ded into a quadru­pole wig­gler, is con­sid­ered. The wig­gler’s struc­ture of al­ter­nat­ing fo­cus­ing and de­fo­cus­ing quadrupoles is used to con­trol sin­gle-bunch breakup in­sta­bil­ity. It is shown that prac­ti­cal re­stric­tions on the max­i­mum at­tain­able quadru­pole field limit the max­i­mum at­tain­able charge in the drive bunch whose sole pur­pose is to pro­duce a high ac­cel­er­at­ing field in the CWA for the fol­low­ing main bunch. It is also pointed out that the dis­tance be­tween drive and main bunches varies along the ac­cel­er­a­tor, caus­ing a mea­sur­able im­pact on the en­ergy gain by the main bunch and on the en­ergy spread of elec­trons in it. Means to mit­i­gate these ef­fects are pro­posed and re­sults are pre­sented for nu­mer­i­cal sim­u­la­tions demon­strat­ing the main bunch with plau­si­ble pa­ra­me­ters for FEL ap­pli­ca­tion in­clud­ing a rel­a­tively small en­ergy spread. Fi­nally, re­sults are pre­sented for the ex­pected FEL per­for­mance using an ap­pro­pri­ately cho­sen un­du­la­tor.
 
slides icon Slides FRB02 [6.512 MB]