HBD HV Control and Monitoring System A Gain vs. HV study throughout Run-9 – PART 2 – Manuel Proissl HBD Meeting 06/23/2009
Upgrades For Run 9 | PHENIX, BNL HBD HV Control System HBD Meeting : : June 23 rd, 2009 GENERAL NOTES § Entire gain and HV data from Run-9 has been processed and is written to the <mod>gain tables in hvdb for future reference. § Several (first) sections of this data have been analyzed and are presented below. § Although gain fluctuations are studied based on parameters we’re aware of having direct effect on the gain, incl. ü P/T measurement and ü Applied GEM voltage; a solid overall conclusion of its real behavior cannot be given at this point, as the following results indicate. HBD HV Control & Monitoring System Manuel Proissl Page 2 of 11
Upgrades For Run 9 | PHENIX, BNL HBD HV Control System HBD Meeting : : June 23 rd, 2009 NO HV CHANGE : : CHANGE IN GAIN ü Gain increases by ~ 50% ü During a PHYSICS running “downtime” of 4 hours, the detector was at Standby. HV activity while no PHYSICS running 3980 V 2500 V HBD HV Control & Monitoring System Manuel Proissl Page 3 of 11
Upgrades For Run 9 | PHENIX, BNL HBD HV Control System HBD Meeting : : June 23 rd, 2009 NO HV CHANGE : : CHANGE IN GAIN ü During the entire inspected runtime, the P/T varied by 0. 25% and stayed within its bin: 2. 52892 - 2. 555846 Torr /K ü During a PHYSICS running “downtime” of 4 hours, the detector was at Standby. ü Gain changed even though no change in voltage nor acceptable P/T within ± 10% window. RUNS PROCESSED: 288007 - 288069 WITHIN P/T BIN: T 1 HBD HV Control & Monitoring System Manuel Proissl Page 4 of 11
Upgrades For Run 9 | PHENIX, BNL HBD HV Control System HBD Meeting : : June 23 rd, 2009 HV CHANGE : : CHANGE IN GAIN ü Gain increases by ~ 96% ü During a PHYSICS running “downtime” of 2 hours, the detector was brought to Standby and then ‘Quadtripped’ before the SA 1 recovered it to a new P/T HV setting… the gain jump appears. QUAD-TRIP HBD HV Control & Monitoring System Manuel Proissl Page 5 of 11
Upgrades For Run 9 | PHENIX, BNL HBD HV Control System HBD Meeting : : June 23 rd, 2009 HV CHANGE : : CHANGE IN GAIN ü Gain increases by ~ 22% ü During a PHYSICS running “downtime” of 2 hours, the detector was brought to Standby. STANDBY HBD HV Control & Monitoring System Manuel Proissl Page 6 of 11
Upgrades For Run 9 | PHENIX, BNL HBD HV Control System HBD Meeting : : June 23 rd, 2009 HV CHANGE : : CHANGE IN GAIN ü During the ENTIRE runtime, P/T has been rising (~ 1%) without any change in gain until it passed the boundary, which is when we adjusted the voltage… ü The software did what it was supposed to do! ü However, the idea is to keep the gain STABLE by adjusting the HV if the gain raises or falls respectively! RUNS PROCESSED: 288835 - 288900 HV CHANGE T 2 T 1/T 2 BOUNDARY T 1 HBD HV Control & Monitoring System 2. 555846 Torr/K Manuel Proissl Page 7 of 11
Upgrades For Run 9 | PHENIX, BNL HBD HV Control System HBD Meeting : : June 23 rd, 2009 HV CHANGE : : “NO” CHANGE IN GAIN ü Before IR Access on June 10 th and after, the gain did not change, although the HV has been changed to the next P/T HV bin. shown above IR ACCESS HBD HV Control & Monitoring System Manuel Proissl Page 8 of 11
Upgrades For Run 9 | PHENIX, BNL HBD HV Control System HBD Meeting : : June 23 rd, 2009 HV CHANGE : : “NO” CHANGE IN GAIN ü The P/T was changing quite a lot as well as the HV after the access. ü Nevertheless, the gain remained constant. RUNS PROCESSED: 288094 - 288900 IR ACCESS T 3 CONFIG CHANGE T 2 T 1 HBD HV Control & Monitoring System APPLY HV CHANGE shown above GAS MIXING HOUSE PROBLEM Manuel Proissl Page 9 of 11
Upgrades For Run 9 | PHENIX, BNL HBD HV Control System HBD Meeting : : June 23 rd, 2009 GAIN STABILITY FOR ALL 200 Ge. V runs One module from the East and West is plotted for the two most activate P/T sets throughout the entire 200 Ge. V run. Only Physics runs without virtual or hardware trips in ES 3 or WN 5 have been chosen. ü Overall stability of the gain can be seen for each individual set. HBD HV Control & Monitoring System Manuel Proissl Page 10 of 11
Upgrades For Run 9 | PHENIX, BNL HBD HV Control System HBD Meeting : : June 23 rd, 2009 Entire P/T Variation for Run-9 ü A large fraction of the 500 Ge. V data shows lower P/T, corresponding to March 15 th to April 13 th. mostly T 1 & T 2 bin activity. ü Unlike the overall 200 Ge. V run, showing several high peaks with a primary bin range of T 2 to T 3. 500 Ge. V HBD HV Control & Monitoring System Manuel Proissl 200 Ge. V Page 11 of 11
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