Author: Ostler, B.
Paper Title Page
WEZD4
 Using Off-Axis Undulator Radiation as a Longitudinal Electron-Beam Diagnostic  
 
  • Q.R. Marksteiner, H.L. Andrews, J.E. Coleman, W.P. Romero, N.A. Yampolsky, M.R.A. Zuboraj
    LANL, Los Alamos, New Mexico, USA
  • S.K. Barber, R.D. Ryne, J. van Tilborg
    LBNL, Berkeley, California, USA
  • C. Emma
    SLAC, Menlo Park, California, USA
  • B. Ostler
    University of Chicago, Chicago, Illinois, USA
  
  Funding: This project was supported by funding from the Los Alamos National Laboratory Laboratory Research and Development program.
A novel di­ag­nos­tic has been de­vel­oped that uses off-axis un­du­la­tor ra­di­a­tion to char­ac­ter­ize the lon­gi­tu­di­nal bunch pro­file of an elec­tron beam. The di­ag­nos­tic uses a small, ~0.1-m long un­du­la­tor with mir­rors that focus the un­du­la­tor ra­di­a­tion onto an array of py­rom­e­ters. The mir­rors both focus the ra­di­a­tion onto the py­rom­e­ter and re­move the chirp­ing ef­fect that comes from the fi­nite length of the un­du­la­tor. Nu­mer­i­cal and an­a­lyt­i­cal mod­els have been de­vel­oped to cal­cu­late the ra­di­a­tion for a given bunch length, and a phase re­trieval al­go­rithm has been de­vel­oped to ex­tract the bunch pro­file from mea­sured data. The di­ag­nos­tic has been in­stalled at the BELLA laser-plasma wake­field ac­cel­er­a­tor, and will be used to char­ac­ter­ize the bunch length there. The con­cept and rel­e­vant re­sults will be pre­sented. 		 
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