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Fawley, W.M.

Paper Title Page
TUPEC064 Full Electromagnetic Simulation of Coherent Synchrotron Radiation via the Lorentz-Boosted Frame Approach 1874
 
  • J.-L. Vay, E. Cormier-Michel, W.M. Fawley, C.G.R. Geddes
    LBNL, Berkeley, California
 
 

Nu­mer­i­cal sim­u­la­tion of some sys­tems con­tain­ing charged par­ti­cles with high­ly rel­a­tivis­tic di­rect­ed mo­tion can be speed­ed up dra­mat­i­cal­ly by choice of the prop­er Lorentz-boost­ed frame*. Or­ders of mag­ni­tude speedup has been demon­strat­ed for sim­u­la­tions from first prin­ci­ples of laser-plas­ma ac­cel­er­a­tor, free elec­tron laser, and par­ti­cle beams in­ter­act­ing with elec­tron clouds. We sum­ma­rize the tech­nique and the most re­cent ex­am­ples. We then ad­dress the ap­pli­ca­tion of the Lorentz-boost­ed frame ap­proach to co­her­ent syn­chrotron ra­di­a­tion (CSR), which can be strong­ly pre­sent in bunch com­pres­sor chi­canes. CSR is par­tic­u­lar­ly rel­e­vant to the next gen­er­a­tion of x-ray light sources and dif­fi­cult to sim­u­late in the lab frame be­cause of the large ratio of scale lengths. It can in­crease both the in­co­her­ent and co­her­ent lon­gi­tu­di­nal en­er­gy spread, ef­fects that often lead to an in­crease in trans­verse emit­tance. We use the WARP code** to sim­u­late CSR emis­sion around dipole sim­ple bends. We pre­sent some scal­ing ar­gu­ments for the pos­si­ble com­pu­ta­tion­al speed up fac­tor in the boost­ed frame and ini­tial 3D sim­u­la­tion re­sults for some stan­dard CSR test cases.


* J.-L. Vay, Phys. Rev. Lett. 98 (2007) 130405
** D.P. Grote, A. Friedman, J.-L. Vay, and I. Haber, AIP Conf. Proc. 749 (2005), 55.