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HV, LV & DCS from MTCC

HV, LV & DCS from MTCC. 23 Barrel chambers and 12 Endcap chambers LV: stable the whole period – no noise observed HV: unstable the 1 th period – more stable but still not ok during the 2 th period Temp: interesting result – some noise period not understood – improve the PVSS datapoint set

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HV, LV & DCS from MTCC

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  1. HV, LV & DCS from MTCC 23 Barrel chambers and 12 Endcap chambers • LV:stable the whole period – no noise observed • HV:unstable the 1th period – more stable but still not ok during the 2th period • Temp:interesting result – some noise period not understood – improve the PVSS datapoint set • DCS:no major problems found in MTCC – some improvement in the future • Condition DB:stable and easy to retrieve • DCS Monitoring:under development (A. Cimmino) to integrate in the DQM next year • Monitoring & Run Control: more work to do next year for integration A. Cimmino - P. Paolucci - G. Polese

  2. HV Imon in 1th MTCC period POWER CYCLE A. Cimmino - P. Paolucci - G. Polese

  3. HV Imon test with Resistors at 904 31 c 31 c WITHOUT FAN UNIT 31 c 20 c WITH FAN UNIT 20 c 20 c A. Cimmino - P. Paolucci - G. Polese

  4. HV power cicle test with Resistors at BLG 904 BOARD 1 CH0/1 POWER CYCLE B2 CHO/1 BOARD 1 CH2 NO FAN-31C NO FAN-31C BOARD 3 CH0/1 BOARD 2 CH0/1 FAN-20C NO FAN-31C BOARD 3 CH2 A. Cimmino - P. Paolucci - G. Polese BOARD 4 CH0/1 FAN-20C FAN-20C

  5. Sotware and Hardware Reset test SW HW A. Cimmino - P. Paolucci - G. Polese

  6. I0set influences Imon readout I0 changed from 800 microA to 750 microA A. Cimmino - P. Paolucci - G. Polese

  7. HV conclusion • We were able to reproduce the instability effect at BLG 904 using resistive charge  problem is not related to the detector/cable • Measuring independently the current on the ground wire we understood the instability was on the monitored current (Imon) and not on the generated current. • The increase let us suspect to a thermal drift of some components and so we begin to use the CAEN fan unit to ventilate the boards. • Using the fans the board temperature went down from 31oC to 20oC and for 6 days Imon was very stable but increased on the 7th • The s of the Imon distribution of the ventilated boards is 0.2 mA and it was twice without fan. • Software power cycle do not affect the Imon (offset is constant) • Hardware power cycle of any board present in the EASY crate affect the offset of all the boards in the crate. • CAEN got all the results and is now trying to reproduce them in their lab. Some critical components has been found !!!! A. Cimmino - P. Paolucci - G. Polese

  8. Preliminary results from MTCC root files have been generated from cond. DB and analyzed MOA and ADC switched off Almost every night History plots (temp & current) A. Cimmino - P. Paolucci - G. Polese

  9. Current Chamber studies <current> distribution of the 23 barrel chambers for a 4 days period with magnet ON and with stable conditions (offset subtracted) RMS = 0.5 mA <I> = 2.5 mA Good to monitor “nervous” or unstable chambers A. Cimmino - P. Paolucci - G. Polese

  10. Average Temp x chamber 24-28 october 2006 <I> = 2.5 mA A. Cimmino - P. Paolucci - G. Polese

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