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HV and LV Stability Assessment in MTCC 23 Barrel and 12 Endcap Chambers

Preliminary results and observations from the Monitoring and Run Control activities in the MTCC 23 barrel and 12 endcap chambers. Includes insights on stability, noise periods, and potential improvements for the PVSS datapoint set and DCS integration.

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HV and LV Stability Assessment in MTCC 23 Barrel and 12 Endcap Chambers

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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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