Author: Luchini, K.
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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MOPGF015 Fast Wire Scanner Upgrade for LCLS 114
 
  • J.M. D'Ewart, M.L. Campell, P. Krejcik, H. Loos, K. Luchini
    SLAC, Menlo Park, California, USA
  
  Wire scan­ners are a main di­ag­nos­tic tool for trans­verse beam size and emit­tance mea­sure­ments at LCLS. The orig­i­nal SLAC wire scan­ners were not op­ti­mized for speed (tak­ing min­utes to scan), and can't per­form at the de­sired level of po­si­tion res­o­lu­tion nec­es­sary for mea­sur­ing LCLS' small beam size. A new fast wire scan­ner, based on a dc lin­ear servo motor, has been de­signed and in­stalled in the LCLS. The new fast wire scan­ner has sev­eral ad­van­tages over the orig­i­nal wire scan­ner: scan times are re­duced from min­utes to sec­onds while min­i­miz­ing wire vi­bra­tions. Rather than count­ing open-loop step pulses, the new fast wire scan­ner uses real time po­si­tion cap­ture for beam syn­chro­nous sam­pling of the wire po­si­tion, en­hanc­ing beam pro­file ac­cu­racy.  
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