Author: Olsen, J.J.
Paper Title Page
MOPGF002 Magnet Corrector Power Supply Controller for LCLS-I 100
 
  • S. Babel, B. Lam, K. Luchini, J.J. Olsen, T. Straumann, E. Williams, C. Yee
    SLAC, Menlo Park, California, USA
  
  The MCOR-12[Mag­net Cor­rec­tor] is a 16-chan­nel mod­u­lar ar­chi­tec­ture, pre­ci­sion mag­net dri­ver, ca­pa­ble of pro­vid­ing bipo­lar out­put cur­rents in the range from 12A to +12A. A sin­gle, un­reg­u­lated bulk power sup­ply pro­vides the main DC power for the en­tire crate. Cur­rently the MCORs have a 1000ppm reg­u­la­tion on the B-field. The MCOR con­troller card up­grades, ex­ist­ing LCLS-I and fu­ture LCLS-II needed, con­trols for Mag­net Cor­rec­tor Power Sup­plies. The pro­ject shifts the ex­ist­ing func­tion­al­ity of the VME based DAC and SAM and an Allen Bradley PLC into a new slot-0 card re­sid­ing in the MCOR chas­sis. Elim­i­na­tion of the VME crate and the PLC will free up rack space to be used in fu­ture. The new in­ter­face card has a long term sta­bil­ity of 100 ppm and mon­i­tors ground fault cur­rents and var­i­ous other in­ter­locks for the MCOR power sup­plies. The con­troller can in­ter­face to EPICS Chan­nel Ac­cess and Fast Feed­back sys­tem at SLAC using two Gi­ga­bit Eth­er­net ports and has an FPGA based EVR for get­ting 'time stamps' from the Event Gen­er­a­tor sys­tem at SLAC. The EPICS con­trol sys­tem along with em­bed­ded di­ag­nos­tic fea­tures will allow for en­hanced re­mote con­trol and mon­i­tor­ing of the power sup­plies.
*S. Babel, S. Cohen, "Digital Control Interface for Bipolar Corrector Power, BiRa Systems, Albuquerque **G.E. Leyh, "A Multi-Channel Corrector Magnet Controller"
 		 
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MOPGF014 LLRF Controls Upgrade for the LCLS XTCAV project at SLAC 110
 
  • S. Condamoor, Y. Ding, P. Krejcik, H. Loos, T.J. Maxwell, J.J. Olsen
    SLAC, Menlo Park, California, USA
  
  Funding: This work was performed in support of the LCLS project at SLAC. Work supported by the U.S. Department of Energy under contract number DE-AC02-76SF00515.
SLAC's Low Level Radio Fre­quency (LLRF) con­trols soft­ware for the S-Band de­flect­ing struc­tures needed to be up­graded sig­nif­i­cantly when a new X-Band trans­verse de­flect­ing cav­ity (XTCAV) was in­stalled down­stream of the LCLS un­du­la­tors in Spring 2013 to as­sist in FEL di­ag­nos­tics such as char­ac­ter­iz­ing the tem­po­ral pro­file of X-ray pulses that vary shot-to-shot. The unique lo­ca­tion of the XTCAV in the beam­line posed sev­eral chal­lenges. A new de­sign of the Mod­u­la­tor and Kly­stron con­trol Sup­port Unit (MKSU-II) for in­ter­lock­ing was added at the XTCAV con­trols sta­tion that re­quired new soft­ware de­vel­op­ment. The tim­ing setup was also dif­fer­ent from the rest of the Linac. This paper out­lines the LLRF con­trols lay­out for the XTCAV and dis­cusses the man­ner in which the chal­lenges were ad­dressed. XTCAV has now be­come a suc­cess­ful tool for gath­er­ing data that en­ables re­con­struc­tion of X-ray FEL power pro­files with greater res­o­lu­tion.
SLAC Publication Number: SLAC-PUB-16414 		 
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MOPGF038 Design and Commissioning Results of MicroTCA Stripline BPM System 180
 
  • S. L. Hoobler, R.S. Larsen, H. Loos, J.J. Olsen, S.R. Smith, T. Straumann, C. Xu, A. Young
    SLAC, Menlo Park, California, USA
  
  The Linac Co­her­ent Light Source (LCLS) is a free elec­tron laser (FEL) fa­cil­ity op­er­at­ing at the SLAC Na­tional Ac­cel­er­a­tor Lab­o­ra­tory (SLAC). A stripline beam po­si­tion mon­i­tor (BPM) sys­tem was de­vel­oped at SLAC [1] to meet the per­for­mance re­quire­ments nec­es­sary to pro­vide high-qual­ity sta­ble beams for LCLS. This de­sign has been mod­i­fied to achieve im­proved po­si­tion res­o­lu­tion in a more com­pact form fac­tor. Pro­to­type in­stal­la­tions of this sys­tem have been op­er­at­ing in the LCLS LINAC and tested at the Po­hang Ac­cel­er­a­tor Lab­o­ra­tory (PAL). Pro­duc­tion sys­tems are de­ployed at the new PAL XFEL fa­cil­ity and at the SPEAR stor­age ring at the Stan­ford Syn­chro­tron Ra­di­a­tion Light­source at SLAC. This paper pre­sents the de­sign and com­mis­sion­ing re­sults of this sys­tem.  
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