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HBD Status

HBD Status. C.Woody For the HBD Group. Shift Change Meeting February 5, 2010. Operational Status. Gains have been set for both East and West Detectors Now running with 4K gain set Balanced to ~ ± 20% Reverse bias gap voltages checked and set

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HBD Status

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  1. HBD Status C.Woody For the HBD Group Shift Change Meeting February 5, 2010

  2. Operational Status • Gains have been set for both East and West Detectors • Now running with 4K gain set • Balanced to ~ ± 20% • Reverse bias gap voltages checked and set • P/T range redefined to accommodate low pressure drops • EN2 has been disabled • Tried to increase gain to make this module useful but it developed more shorts • Tried installing zener voltage divider, but still got trips • May try lower voltage zeners at some point, but doesn’t look hopeful • Often get HBD busy which slows down DAQ rate • Don’t really know what the problem is, but best solution seems to be to do a Quick Feed followed by a fresh Download from Run Control • Online Monitoring is improved • Added warning when gains are out of range • Added plots showing pulse height spectra per pad for central events • HBD has been added to OnCal and is now running C.Woody, HBD Status, 2/5/10

  3. Quality of Electron Tracks in this Run • Vertex: for HBD analysis we usually use +/-20 cm, so the good fraction of the events will be thrown away • DC track quality: usually for electron analysis we use (31||51||63). Perhaps DC experts should comment whether the quality distribution looks reasonable • According to Taku all RICH distributions looks as usual • Matching to EMC looks OK • And finally E/p made with usual quality and RICH cuts, looks fine I.Ravinovich C.Woody, HBD Status, 2/5/10

  4. HBD Data after Reconstruction • HBD data looks reasonable • Matching distributions are OK • The cluster size as expected • The charge distribution of the cluster matched to the electron track from Central Arm is very similar to one observed in Run-9 • Needs much more statistics to go to the pair level (Dalitz pairs) in order to check the HBD performance, namely number of p.e. per single electron I.Ravinovich C.Woody, HBD Status, 2/5/10

  5. Backup Slides C.Woody, HBD Status, 2/5/10

  6. West Gains BBC Cut 20 C.Woody, HBD Status, 2/5/10

  7. East Gains BBC Cut 20 C.Woody, HBD Status, 2/5/10

  8. WS1 ES1 -5V -15V ES2 WS2 -10V -10V ES3 WS3 -5V -5V WS4 ES4 -5V -10V WS5 ES5 -15V -15V dV Scan C.Woody, HBD Status, 2/5/10

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