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HBD HV commissioning: summary of events from Jan. 31 till Feb. 6 discussion on how to proceed

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HBD HV commissioning: summary of events from Jan. 31 till Feb. 6 discussion on how to proceed. Itzhak Tserruya HBD meeting, BNL February 6, 2007. Summary of last 6 days (I).

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slide1

HBD HV commissioning:

  • summary of events from Jan. 31 till Feb. 6
  • discussion on how to proceed

Itzhak Tserruya

HBD meeting, BNL February 6, 2007

summary of last 6 days i
Summary of last 6 days (I)
  • Jan. 31- Feb 1: The GEM by GEM conditioning in CF4 went quite fast and smoothly. Took 2 days. Results are in general consistent with the conditioning in N2. (see slides 3-10). Summary in slides 11,12.
  • Friday Feb. 2:
    • The entire detector with the exception of 3 modules that draw too large current (WN3, WS3 and EN2) was brought up to 2600V 2 w/o any problem.
    • Lots of software written by Deepali, Jason and Sasha, to allow individual parameter setting for each module and to record module history to monitor stability.
    • Raising HV up to 3000 V on the entire detector by the end of the day – no problem only occasional single module trip
  • Saturday Feb. 3
en0 1 2

20 MOhm slope

10 MOhm slope

Conditioning in N2

Conditioning in CF4

EN0,1,2
en3 4 5

20 MOhm slope

10 MOhm slope

Conditioning in N2

Conditioning in CF4

EN3,4,5
es0 1 2

20 MOhm slope

10 MOhm slope

Conditioning in N2

Conditioning in CF4

ES0,1,2
es3 4 5

20 MOhm slope

10 MOhm slope

Conditioning in N2

Conditioning in CF4

ES3,4,5
wn0 1 2

20 MOhm slope

10 MOhm slope

Conditioning in N2

Conditioning in CF4

WN0,1,2
wn3 4 5

20 MOhm slope

10 MOhm slope

Conditioning in N2

Conditioning in CF4

WN3,4,5
ws0 1 2

20 MOhm slope

10 MOhm slope

Conditioning in N2

Conditioning in CF4

WS0,1,2
ws3 4 5

20 MOhm slope

10 MOhm slope

Conditioning in N2

Conditioning in CF4

WS3,4,5
r view cf4 feb 1 2007
R-view CF4 - Feb. 1, 2007

R1/R2/R3

R1: R_GEM at 100V

R2: R_GEM at 500V

R3: R installed in resistive

chain

summary of last 6 days ii
Summary of last 6 days (II)
  • Friday Feb. 2:
    • The entire detector with the exception of 3 modules that draw too large current (WN3, WS3 and EN2) was brought up to 2600V 2 w/o any problem.
    • Lots of software written by Deepali, Jason and Sasha, to allow individual parameter setting for each module and to record module history to monitor stability.
    • Raising HV up to 3000 V on the entire detector by the end of the day – no problem only occasional single module trip
  • Saturday Feb. 3
    • Raise HV to 3100 V on the entire detector. Occasional single module trips.
  • Sunday Feb. 4
    • Raise HV to 3200V on the entire detector with the exception of the modules which show non-ohmic behavior and have a 20MOhm or infinity resistors in the chain (WN0, EN4, ES4) and (WS2, WS3 and EN2). These six modules are for the time being at 3100 V.
summary of last 6 days iii
Summary of last 6 days (III)
  • Sunday Feb. 4
    • At 3200 V we saw cosmic signals at the expected rate of 1 count/10 sec per pad in a perfect module (ES3). The rate decreased for those modules that have a current flowing thru the top GEM.
    • Got several massive trips both on the East and West
  • Monday Feb. 5
    • The massive trips take long time to recover. Usually we did not see damage with one exception: WN4 show a short between mesh and top face of top GEM.
    • Try to stabilize the detector at 3200 V
how to proceed
How to proceed
  • It seems that we are rather stable not at 3200 V.
  • Shall we continue to raise HV on the entire detector at once or shall we proceed one module or a group of modules at a time?
resistive chain
Resistive Chain

Outside HBD

=2.2M

Inside HBD

28 HV segments in each GEM

R2=20M

Top GEM

=10M

Middle GEM

Bottom GEM

  • Normal operation: HV= 3720V VGEM = 500V I = 150A
  • Dead short in one GEM: I increases by 1.56%
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