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HBD Status

HBD Status. C.Woody For the HBD Group. Shift Change Meeting March 27, 2009. Cherenkov blobs. e -. e +. q pair opening angle. ~ 1 m. HBD Detector. 20 GEM Modules 10 on each side Bottom 4 not instrumented. All modules on West working One bad module on East (ES1)

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HBD Status

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  1. HBD Status C.Woody For the HBD Group Shift Change Meeting March 27, 2009

  2. Cherenkov blobs e- e+ qpair opening angle ~ 1 m HBD Detector 20 GEM Modules 10 on each side Bottom 4 not instrumented • All modules on West working • One bad module on East (ES1) • - not recoverable during this run • One module (EN4) needs resistor • change during next access C.Woody, HBD Status, 3/27/09

  3. SA1 Responsibilities • Use HBD HV Control Program • Normal mode of operation is Reverse Bias • Reset any trips as described in Standing Orders • Treat essentially like DC/PC • Go to Standby when filling, dumping beams, polarization measurement • Not as sensitive to backgrounds as DC/PC, but treat the same anyway (e.g., go to Operational when backgrounds < 100K) • Exception: Go to Standby when ramping magnets up or down • Correct for P/T as needed • Message will appear • LV should be ON • Keep an eye on air flow and temperature C.Woody, HBD Status, 3/27/09

  4. LV Control and Temperature Sensors Temps should be below ~ 35 degrees LV ON = Red Air Flow ON = Green C.Woody, HBD Status, 3/27/09

  5. HBD HV Control System Control Panel Status Indicator M.Proissl C.Woody, HBD Status, 3/27/09

  6. P/T Voltage Adjustment M.Proissl C.Woody, HBD Status, 3/27/09

  7. HBD Divider Currents M.Proissl All currents at Standby (2500V) should be between 89.0 and < 90.0 microamps (except ES1) C.Woody, HBD Status, 3/27/09

  8. Calibration • Balanced gain using scintillation signal for each module - establishes HV setting for each module (GEM+Mesh) - compute 5 voltage sets for each module to correct for P/T variations - working on pad by pad calibration ( offline) • Set drift gap voltage in each module to optimize p.e. collection efficiency vs hadron blindness - done once  complete • Took 200M MB events at reverse bias in ± field configuration and processed ~ 143M offline - Note: various other detector calibrations may not have been optimal when this was done C.Woody, HBD Status, 3/27/09

  9. Scintillation MIPs FORWARD REVERSE Forward and Reverse Bias Spectra 1 p.e. Spectra show two components: • Single electrons from scintillation (exponential)  Use this to measure gain • MIP (Landau) C.Woody, HBD Status, 3/27/09

  10. Noise (Pedestals) Typical sigma ~ 1.5 chs ( ~ 0.3 photoelectrons) Zero suppression threshold at 5 ch C.Woody, HBD Status, 3/27/09

  11. Slope ~ 5 chs Gain Balancing WN1 WN2 WN4 WN3 C.Woody, HBD Status, 3/27/09

  12. Drift Gap Voltage Adjustment ES2 -10V ES1 -10V ES3 -15V ES4 -10V C.Woody, HBD Status, 3/27/09

  13. Pad by Pad Gain Calibration (Offline) EN3 FB A.Iordanova C.Woody, HBD Status, 3/27/09

  14. Online Monitoring (ADCs) ADC PH Time sample (0-11) C.Woody, HBD Status, 3/27/09

  15. Online Monitoring (Hits) ES1 not operational C.Woody, HBD Status, 3/27/09

  16. Offline Analysis Response for Single and Double Electrons “Open” Dalitz Pairs (~ Single Electrons) “Closed” Dalitz Pairs (~ Double Electrons) I.Ravinovich C.Woody, HBD Status, 3/27/09

  17. ~ 15 e’s Offline AnalysisHadronic Response Forward Bias Reverse Bias I.Ravinovich C.Woody, HBD Status, 3/27/09

  18. Status Summary • One bad module (ES1) – on the edge of acceptance • Module gain calibration done (good to ~ 10%) • Drift gap voltage scan done (good to ~ 5V) • Shift crew can operate the detector • SA1 use HBD HV program • DM check online plots • Collected 200M MB events at reverse bias in ± field configuration • Track associations look good • Initial single vs double electron spectra look good C.Woody, HBD Status, 3/27/09

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