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HBD HV Control and Monitoring System

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 Run9 | PHENIX, BNL HBD HV Control System HBD Meeting :: June 23 rd , 2009.

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HBD HV Control and Monitoring System

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  1. HBD HV Controland Monitoring System A Gain vs. HV study throughout Run-9 – PART 2 – Manuel Proissl HBD Meeting 06/23/2009

  2. Upgrades For Run9 | PHENIX, BNL HBD HV Control System HBD Meeting :: June 23rd, 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. • P/T measurement and • 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

  3. Upgrades For Run9 | PHENIX, BNL HBD HV Control System HBD Meeting :: June 23rd, 2009 NO HV CHANGE :: CHANGE IN GAIN • Gain increases by ~ 50% • During a PHYSICS running “downtime” of 4 hours, the detector was at Standby. HV activity while no PHYSICS running 3980V 2500V HBD HV Control & Monitoring System Manuel Proissl Page 3 of 11

  4. Upgrades For Run9 | PHENIX, BNL HBD HV Control System HBD Meeting :: June 23rd, 2009 NO HV CHANGE :: CHANGE IN GAIN • During the entire inspected runtime, the P/T varied by 0.25% and stayed within its bin: • 2.52892 - 2.555846 Torr /K • During a PHYSICS running “downtime” of 4 hours, the detector was at Standby. •  Gain changed even though no change in voltage nor acceptable P/T within ±10% window. RUNS PROCESSED: 288007 - 288069 WITHIN P/T BIN: T1 HBD HV Control & Monitoring System Manuel Proissl Page 4 of 11

  5. Upgrades For Run9 | PHENIX, BNL HBD HV Control System HBD Meeting :: June 23rd, 2009 HV CHANGE :: CHANGE IN GAIN • Gain increases by ~ 96% • During a PHYSICS running “downtime” of 2 hours, the detector was brought to Standby and then ‘Quad-tripped’ before the SA1 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

  6. Upgrades For Run9 | PHENIX, BNL HBD HV Control System HBD Meeting :: June 23rd, 2009 HV CHANGE :: CHANGE IN GAIN • Gain increases by ~ 22% • 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

  7. Upgrades For Run9 | PHENIX, BNL HBD HV Control System HBD Meeting :: June 23rd, 2009 HV CHANGE :: CHANGE IN GAIN • 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… • The software did what it was supposed to do! • 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 T2 T1/T2 BOUNDARY 2.555846 Torr/K T1 HBD HV Control & Monitoring System Manuel Proissl Page 7 of 11

  8. Upgrades For Run9 | PHENIX, BNL HBD HV Control System HBD Meeting :: June 23rd, 2009 HV CHANGE :: “NO” CHANGE IN GAIN • Before IR Access on June 10th 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

  9. Upgrades For Run9 | PHENIX, BNL HBD HV Control System HBD Meeting :: June 23rd, 2009 HV CHANGE :: “NO” CHANGE IN GAIN • The P/T was changing quite a lot as well as the HV after the access. • Nevertheless, the gain remained constant. RUNS PROCESSED: 288094 - 288900 IR ACCESS T3 CONFIG CHANGE APPLY HV CHANGE T2 shown above GAS MIXING HOUSE PROBLEM T1 HBD HV Control & Monitoring System Manuel Proissl Page 9 of 11

  10. Upgrades For Run9 | PHENIX, BNL HBD HV Control System HBD Meeting :: June 23rd, 2009 GAIN STABILITY FOR ALL 200GeV runs • One module from the East and West is plotted for the two most activate P/T sets throughout the entire 200 GeV run. Only Physics runs without virtual or hardware trips in ES3 or WN5 have been chosen. • Overall stability of the gain can be seen for each individual set. HBD HV Control & Monitoring System Manuel Proissl Page 10 of 11

  11. Upgrades For Run9 | PHENIX, BNL HBD HV Control System HBD Meeting :: June 23rd, 2009 Entire P/T Variation for Run-9 • A large fraction of the 500 GeV data shows lower P/T, corresponding to March 15th to April 13th.  mostly T1 & T2 bin activity. • Unlike the overall 200 GeV run, showing several high peaks with a primary bin range of T2 to T3. 500 GeV 200 GeV HBD HV Control & Monitoring System Manuel Proissl Page 11 of 11

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