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Chen, S.D.

Paper Title Page
WEPD040 Spectrum Property Analysis of a Wiggler-like Undulator 3177
 
  • S.D. Chen, T.M. Uen
    NCTU, Hsinchu
  • C.-S. Hwang
    NSRRC, Hsinchu
  
 

A wig­gler with the prop­er­ty of low total ra­di­a­tion power and keep­ing high pho­ton flux in hard x-ray re­gion, 5-20 keV, which is nec­es­sary for the spe­cial de­mand of users, was under in­ves­ti­gat­ed for re­duc­ing the dif­fi­cul­ty of the de­sign of op­ti­cal com­po­nents in the beam line and de­creas­ing the load of RF cav­i­ty power. Such an in­ser­tion de­vise was called wig­gler-like un­du­la­tor. The spec­trum of wig­gler-like un­du­later was in­ves­ti­gat­ed with a code, of which the al­go­rithm is based on the com­pro­mis­ing be­tween pho­ton flux and ra­di­a­tion power of in­ser­tion de­vices for spec­trum op­ti­miza­tion. The prop­er­ty of the spec­trum of the wig­gler-like un­du­la­tor are dis­cussed here­in. Fur­ther­more, the bril­liance and the power dis­tri­bu­tion are some­how also dis­cussed.

  
WEPD043 The Development of Gradient Damping Wiggler for ALPHA Storage Ring 3186
 
  • Z.W. Huang, D.J. Huang
    NTHU, Hsinchu
  • S.D. Chen, M.-H. Huang, C.-S. Hwang, C.Y. Kuo, F.-Y. Lin, Y.T. Yu
    NSRRC, Hsinchu
  • S.-Y. Lee
    IUCF, Bloomington, Indiana
  
 

A novel gra­di­ent damp­ing wig­gler (GDW) was de­vel­oped for the ALPHA stor­age ring in In­di­ana Uni­ver­si­ty. The GDW will be used to change the mo­men­tum com­paction fac­tor and the damp­ing par­ti­tion at ALPHA stor­age ef­fec­tive­ly. There is one mid­dle pole and two outer poles that they have gra­di­ent field were as­sem­bled to­geth­er on the same gird­er to be a full set of GDW mag­net sys­tem. The dipole and gra­di­ent field strength of the mid­dle (outer) pole is 0.67 T (-0.67) and 1.273 T/m (1.273 T/m), re­spec­tive­ly. The mag­net gap of the mid­dle and outer pole is 40 mm and 35.87 mm, re­spec­tive­ly, that the three com­bined func­tion of dipole mag­net can be charged by the same power sup­ply. There is a trim coil on the three mag­nets to ad­just the first and sec­ond in­te­gral field to zero. The good field re­gion of mid­dle pole and outer pole in trans­verse x-ax­is (deltaB/B=0.1%) are ±50mm and ±40mm sep­a­rate­ly. A pro­to­type GDW mag­net was fab­ri­cat­ed and a Hall probe mea­sure­ment sys­tem was set up to mea­sure the mag­net field to ver­i­fy the mag­net de­sign and the mag­net con­struc­tion per­for­mance. The field cross-talk and the fringe field are also dis­cussed here­in by dif­fer­ent meth­ods.