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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).

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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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  1. 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

  2. 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

  3. 20 MOhm slope 10 MOhm slope Conditioning in N2 Conditioning in CF4 EN0,1,2

  4. 20 MOhm slope 10 MOhm slope Conditioning in N2 Conditioning in CF4 EN3,4,5

  5. 20 MOhm slope 10 MOhm slope Conditioning in N2 Conditioning in CF4 ES0,1,2

  6. 20 MOhm slope 10 MOhm slope Conditioning in N2 Conditioning in CF4 ES3,4,5

  7. 20 MOhm slope 10 MOhm slope Conditioning in N2 Conditioning in CF4 WN0,1,2

  8. 20 MOhm slope 10 MOhm slope Conditioning in N2 Conditioning in CF4 WN3,4,5

  9. 20 MOhm slope 10 MOhm slope Conditioning in N2 Conditioning in CF4 WS0,1,2

  10. 20 MOhm slope 10 MOhm slope Conditioning in N2 Conditioning in CF4 WS3,4,5

  11. 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

  12. Status as of Feb. 1, 2007

  13. 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.

  14. 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

  15. 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?

  16. 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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