LBDS MKD tracking related problems. Outline tracking problems: Exchange of MKD compensation/principal PS Same BETS limit for all generators.

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Presentation transcript:

LBDS MKD tracking related problems

Outline tracking problems: Exchange of MKD compensation/principal PS Same BETS limit for all generators

MKD generator 1)PLC set the HVPS reference 2)HVPS generate something 3)Voltage drop on input stage (resistance/diode?) 4)Switch/capa is charged 5)PLC tracks voltage on capa 6)BETS tracks voltage on capa 7)IPOC monitors magnet current Remark: No measurement of HVPS output voltage

Exchange of MKD PS When a PS is exchanged, small offset variations could provoke a BETS interlock. Procedure = Energy-Scan  New PLC tracking tables  New BETS tracking tables  New XPOC limits If variation is too important, all settings for all generators have to be regenerated (extreme case)

Exchange of MKD PS Solution to exchange HVPS transparently? Add offset adjustment on the HVPS (manual intervention, hardware calibration) Add parameters to compensate for this offset in the PLC (manual intervention, fixed parameters, no MCS check) Add an automatic calibration of the HVPS reference in the PLC, based on DVs2 voltage. (manual intervention, fixed parameters, no MCS check) Add a continuous closed-loop control of the HVPS reference in the PLC, based on DVs2 voltage. (limits on correction with MCS check)

Same BETS limit for all generators ? Now all generators have the same HVPS reference tables. HPVS + Input Stage = Different capa voltages => different BETS tracking tables => different PLC tracking tables If all generators had the same capa voltage (BETS) => different HVPS reference tables But: => same BETS tracking tables => same PLC tracking tables

Same BETS limit for all generators ? BETS measure over PLC reference: BETS acquisition chain errors (Voltage divider, BEA) ?

Same BETS limit for all generators ? PLC DVs2A measure over reference: < +/- 1.5 % => Is it correlated with BETS ?

Same BETS limit for all generators ? Same capa voltage (BETS) would imply: Input voltage differences of ~ 1% between generators => Is it acceptable ? Modification of the Java application that computes the LBDS parameters => don’t worry, I’ll take care of that … Remark: Same != constant: After exchange of one generator, all settings for all generators might need a regeneration, including the BETS tracking tables.