Author: Iverson, R.H.
Paper Title Page
TUB03 FEL Overcompression in the LCLS 337
 
  • J.L. Turner, F.-J. Decker, Y. Ding, Z. Huang, R.H. Iverson, J. Krzywinski, H. Loos, A. Marinelli, T.J. Maxwell, H.-D. Nuhn, D.F. Ratner, T.J. Smith, J.J. Welch, F. Zhou
    SLAC, Menlo Park, California, USA
  
  Funding: This work was supported by U.S. Department of Energy, Office of Basic Energy Sciences, under Contract DE-AC02-76SF00515
Over­com­pres­sion of the Linac Co­her­ent Light Source (LCLS) x-ray Free Elec­tron Laser (FEL) at the SLAC Na­tional Ac­cel­er­a­tor Cen­ter is stud­ied. The stud­ies and op­er­a­tional im­pli­ca­tions are sum­ma­rized in this talk. 		 
slides icon Slides TUB03 [4.493 MB]  
 
THP026 Design Study of LCLS Chirp-Control with a Corrugated Structure 748
 
  • Z. Zhang, K.L.F. Bane, Y. Ding, Z. Huang, R.H. Iverson, T.J. Maxwell, G.V. Stupakov, L. Wang
    SLAC, Menlo Park, California, USA
  • P. Frigola, M.A. Harrison, M. Ruelas
    RadiaBeam, Marina del Rey, California, USA
  
  The pur­pose of this paper is to in­ves­ti­gate the use of flat metal­lic plates with small cor­ru­ga­tions as a pas­sive dechirper, study­ing its ef­fects on beam dy­nam­ics. Sim­i­lar sys­tems have been tested in Po­hang and Brookhaven at rel­a­tively low en­er­gies (~100 MeV) and with rel­a­tively long bunches (>1ps) [*,**]. Four me­ters of such a struc­ture are being ma­chined by Ra­di­a­beam Sys­tems for use in the LCLS with a high en­ergy and fem­tosec­ond elec­tron beam. In this paper we use a field match­ing pro­gram to ob­tain the lon­gi­tu­di­nal and trans­verse wakes for the pur­pose of the LCLS dechirper de­sign. In ad­di­tion, we fit the lon­gi­tu­di­nal wake to sim­ple func­tions, so that one can ob­tain the wake with­out re­sort­ing to the field match­ing pro­gram. Since the trans­verse wakes–both di­pole and quadru­pole wakes–are strong, we in­clude beam dy­nam­ics sim­u­la­tions to find the tol­er­ances for in­jec­tion jit­ter and mis­align­ment in the LCLS.
* P. Emma, et al. PRL 112, 034801
** M. Harrison, et al., NaPAc 2013, Pasadena, USA 		 
 
THP033 Mechanical Design for a Corrugated Plate Dechirper System for LCLS 785
 
  • M.A. Harrison, P. Frigola, D.W. Martin, A.Y. Murokh, M. Ruelas
    RadiaBeam Systems, Santa Monica, California, USA
  • Z. Huang, R.H. Iverson, T.J. Maxwell, Z. Zhang
    SLAC, Menlo Park, California, USA
  
  Funding: This work is supported by Department of Energy grant number DE-SC0009550.
Ra­di­a­Beam Sys­tems is de­vel­op­ing a novel pas­sive chirp re­moval sys­tem using cor­ru­gated plates as stud­ied by Bane and Stu­pakov.* Fol­low­ing on from low-en­ergy ex­per­i­ments at BNL-ATF,** RBS will in­stall a much larger and pow­er­ful sys­tem for re­mov­ing the chirp from the 3-GeV beams in the LTU sec­tion at LCLS. The larger plates will pre­sent new chal­lenges in the areas of man­u­fac­tur­ing and me­chan­i­cal con­trol. In this paper we re­view the re­quire­ments for the di­men­sions of the cor­ru­gated plates for proper op­er­a­tion and the in­fra­struc­ture nec­es­sary for pre­cisely plac­ing the plates so as not to ad­versely dis­rupt the beam.
* K. Bane, et al "Corrugated Pipe as a Beam Dechirper," SLAC-PUB-14925, 2012
** Harrison, M., et al "Removal of Residual Chirp in Compressed Beams Using a Passive Wakefield Technique." NaPAC13, 2013