Author: Gayadeen, S.
Paper Title Page
TUPHA118 Correction of 10 Hz Orbit Distortion From Diamond's I10 Fast Switching Chicane 682
 
  • M.J. Furseman, C.P. Bailey, S. Gayadeen, G. Rehm, W.A.H. Rogers
    DLS, Oxfordshire, United Kingdom
  
  The I10 beam­line at Di­a­mond Light Source is con­fig­ured to study cir­cu­lar dichro­ism. To in­crease sig­nal to noise ratio be­tween the two beam po­lar­i­sa­tions and in­crease tem­po­ral res­o­lu­tion the beam­line is fed by two sep­a­rate IDs that are typ­i­cally con­fig­ured with op­po­site handed po­lar­i­sa­tions. A chi­cane of steer­ing mag­nets with pro­gram­ma­ble power sup­plies is used to pro­vide 10 Hz switch­ing be­tween the two pho­ton beams by pro­duc­ing a dy­namic closed bump that al­ter­nates the on-axis tra­jec­tory of the elec­tron beam be­tween the two IDs. In order to main­tain the closed bump and make the switch­ing trans­par­ent to the rest of the pho­ton beam­lines the phase and am­pli­tude of the sine func­tions ap­plied to the chi­cane mag­nets must be ex­actly cor­rect. In this paper the lin­ear scheme that was used to cor­rect the resid­ual 10 Hz orbit dis­tor­tion is pre­sented. Fu­ture work that uses the fully pro­gram­ma­ble na­ture of the mag­net power sup­ply con­trollers to cor­rect high order dis­tor­tions is also dis­cussed.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-TUPHA118  
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