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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
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


Hv imon in 1 th mtcc period
HV Imon in 1th MTCC period

POWER CYCLE

A. Cimmino - P. Paolucci - G. Polese


Hv imon test with resistors at 904
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


Hv power cicle test with resistors at blg 904
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


Sotware and hardware reset test
Sotware and Hardware Reset test

SW

HW

A. Cimmino - P. Paolucci - G. Polese


I0set influences imon readout
I0set influences Imon readout

I0 changed from 800 microA to 750 microA

A. Cimmino - P. Paolucci - G. Polese


Hv conclusion
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


Preliminary results from mtcc
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


Current chamber studies
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


Average temp x chamber
Average Temp x chamber

24-28 october 2006

<I> = 2.5 mA

A. Cimmino - P. Paolucci - G. Polese


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