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LBDS MKD tracking related problems

LBDS MKD tracking related problems. Outline. tracking problems: Exchange of MKD compensation/principal PS Same BETS limit for all generators. MKD generator. PLC set the HVPS reference HVPS generate something Voltage drop on input stage (resistance/diode?) Switch/ c apa is charged

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LBDS MKD tracking related problems

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  1. LBDS MKDtracking related problems

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

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

  4. 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)

  5. 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)

  6. 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

  7. Same BETS limit for all generators ? BETS measure over PLC reference: < +/- 1 %=> BETS acquisition chain errors (Voltage divider, BEA) ?

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

  9. 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.

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