Author: Wurtz, W.A.
Paper Title Page
WEXC05 First Results Operating a Long-Period EPU in Universal Mode at the Canadian Light Source 2566
 
  • W.A. Wurtz, C.K. Baribeau, D. Bertwistle, M.J. Sigrist
    CLS, Saskatoon, Saskatchewan, Canada
  
  The Quan­tum Ma­te­ri­als Spec­troscopy Cen­tre beam­line at the Cana­dian Light Source (CLS) re­quires pho­tons with en­er­gies as low as 15 eV with cir­cu­lar po­lar­iza­tion at the end sta­tion. This en­ergy range is ac­com­plished on the 2.9 GeV CLS stor­age ring using an el­lip­ti­cally po­lar­iz­ing un­du­la­tor (EPU) with a 180 mm pe­riod, which we call EPU180. In order to re­al­ize cir­cu­lar po­lar­ized pho­tons at the end sta­tion with this low en­ergy, we must over­come two tech­ni­cal is­sues. First, the beam­line op­tics dis­tort the po­lar­iza­tion of the light, so we com­pen­sate by pro­vid­ing light with a flat­tened, tilted po­lar­iza­tion el­lipse at the source point - a mode of op­er­a­tion known as uni­ver­sal mode. Sec­ond, the de­vice has a strong ef­fect on the elec­tron beam due to dy­namic fo­cus­ing and is ca­pa­ble of re­duc­ing the in­jec­tion ef­fi­ciency to zero. We over­come this non-lin­ear dy­namic fo­cus­ing using cur­rent strips ad­hered to the vac­uum cham­ber. In this re­port, we pre­sent the first re­sults with op­er­at­ing EPU180 in uni­ver­sal mode and we re­cover the dy­namic aper­ture using the cur­rent strips.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEXC05  
About • paper received ※ 13 May 2021       paper accepted ※ 05 July 2021       issue date ※ 11 August 2021  
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WEPAB120 Upgrades to the Booster to Storage Ring Transfer Line at the Canadian Light Source 2881
 
  • W.A. Wurtz, T. Batten, B.E. Bewer, M. Bree, S.R. Carriere, A.M. Duffy, B. Fogal, L.X. Lin, C.M. Randall, B.A. Schneider, J.M. Vogt, J. Willard, T. Wilson
    CLS, Saskatoon, Saskatchewan, Canada
  • P. Kuske
    HZB, Berlin, Germany
  
  In­ves­ti­ga­tions into the booster to stor­age ring trans­fer process iden­ti­fied non-lin­ear fields in the booster ex­trac­tion sep­tum as the cause for the poor trans­fer ef­fi­ciency. We found that by cor­rect­ing the tra­jec­tory through the sep­tum, the trans­fer ef­fi­ciency im­proved sub­stan­tially. This mo­ti­vated an up­grade pro­ject to re­li­ably con­trol the tra­jec­tory through the sep­tum and trans­fer line, to pro­vide im­proved di­ag­nos­tics and to im­ple­ment a set of four hor­i­zon­tal scrap­ers to re­duce the hor­i­zon­tal emit­tance of the beam be­fore it reaches the stor­age ring.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB120  
About • paper received ※ 10 May 2021       paper accepted ※ 24 June 2021       issue date ※ 23 August 2021  
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