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


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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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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

  • 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


Status as of feb 1 2007

Status as of Feb. 1, 2007


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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