Author: Madur, A.
Paper Title Page
WEPA24 Error Analysis for Hybrid Undulators 387
 
  • D. Arbelaez, A. Madur, S. Marks, S. Prestemon, D. Schlueter
    LBNL, Berkeley, California, USA
  • H.-D. Nuhn
    SLAC, Menlo Park, California, USA
  
  Funding: This work was supported by the Director, Office of Science, of the US Department of Energy under Contract No. DE-AC02-05CH11231.
An analy­sis is per­formed on var­i­ous pos­si­ble er­rors that may occur through­out a hy­brid un­du­la­tor. Of par­tic­u­lar sig­nif­i­cance is the scal­ing of the var­i­ous er­rors with vari­a­tions in the gap of the de­vice. Tun­ing strate­gies are con­sid­ered for the mit­i­ga­tion of these er­rors for the en­tire range of us­able gap. Sort­ing strate­gies for the re­duc­tion of the ini­tial er­rors in the un­du­la­tor are also con­sid­ered. Specif­i­cally, the ef­fec­tive­ness of the sort­ing al­go­rithm is eval­u­ated with re­spect to the num­ber of per­ma­nent mag­net blocks used per pole as well as the size and dis­tri­b­u­tion of the block pop­u­la­tion. The re­sults of this analy­sis are ap­plied to the LCLS-II un­du­la­tors to de­ter­mine the re­quired ma­chin­ing and po­si­tion­ing tol­er­ances and vi­able tun­ing strate­gies in order to meet the de­sign re­quire­ments. 		 
 
THOAI2
 Development of Superconducting Undulators  
 
  • S. Prestemon, D. Arbelaez, T. Koettig, A. Madur, S. Marks, D. Schlueter
    LBNL, Berkeley, California, USA
  
  Funding: This work was supported by the Director of the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
Un­du­la­tor tech­nol­ogy plays a crit­i­cal role in FEL per­for­mance. The de­sire to pro­vide a spe­cific range of pho­ton wave­lengths for sci­ence ap­pli­ca­tions con­strains the de­sign space of elec­tron beam en­ergy and un­du­la­tor tun­ing ca­pa­bil­i­ties. In par­tic­u­lar, the cou­pling be­tween pho­ton wave­length, beam en­ergy, and un­du­la­tor pe­riod and strength in­di­cates that un­du­la­tor tech­nol­ogy is a major cost dri­ver in the de­sign of FEL fa­cil­i­ties. Su­per­con­duct­ing un­du­la­tors have the po­ten­tial to sig­nif­i­cantly im­prove upon per­for­mance of cur­rent state-of-the-art un­du­la­tor tech­nolo­gies being im­ple­mented in the first FEL fa­cil­i­ties. Here we re­view the sta­tus of su­per­con­duct­ing un­du­la­tor tech­nol­ogy, in­clud­ing de­vel­op­ments in the areas of he­li­cal, pla­nar, and vari­able po­lar­iz­ing su­per­con­duct­ing un­du­la­tor con­cepts at a va­ri­ety of lab­o­ra­to­ries around the world. Im­pli­ca­tions of su­per­con­duct­ing un­du­la­tor per­for­mance for FEL ap­pli­ca­tions are de­scribed. Fi­nally, the major tech­no­log­i­cal hur­dles that re­main to be ad­dressed prior to im­ple­men­ta­tion in FEL fa­cil­i­ties are out­lined, to­gether with a sum­mary of cur­rent R&D ef­forts. 		 
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