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Update on Results of the prototype beam test

Update on Results of the prototype beam test. Maxim Naglis, Deepali Sharma and Itzhak Tserruya HBD meeting, BNL, September 12, 2006. Run List. Date Time Run# B Drift V start end

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Update on Results of the prototype beam test

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  1. Update on Results of the prototype beam test Maxim Naglis, Deepali Sharma and Itzhak Tserruya HBD meeting, BNL, September 12, 2006

  2. Run List Date Time Run# B Drift V start end 5/27/06 4:35:47 4:43:31 203115 0 5/27/06 4:54:20 5:52:21 203116 0 + 495 5/27/06 6:08:51 7:07:00 203117 0 - 495 5/27/06 18:08:52 18:37:19 203142 0 + 495 5/27/06 18:39:58 19:09:06 203143 0 - 495 5/27/06 19:24:03 19:58:38 203145 0 + 495 5/27/06 20:04:46 20:45:20 203146 0 + 505 5/27/06 21:06:55 21:36:46 203150 0 - 505 6/2/06 2:20:17 3:19:36 204191 +- + 505 6/2/06 3:22:01 4:21:05 204192 +- - 505 6/2/06 4:44:08 4:49:29 204194 0 - 505 6/2/06 4:52:01 5:51:08 204195 0 + 505 6/2/06 5:55:25 6:53:38 204196 0 - 505 6/2/06 6:58:18 7:44:43 204197 0 - 505 6/2/06 7:48:14 8:18:36 204198 0 + 505 Results presented here are only for the B=0 runs

  3. Analysis 1. HBD: • events must have at least one pad with A>16 ADC counts • events with more than 10 fired pads are rejected • shape analysis: samples (8+9+10)/3 – sample 0 2. Central arm: • DC-PC1 no quality selection • PC3 matching: |dphi|<0.015 && |dze| <7 • EMCal matching: |dphi|<0.02 && |dze| <7 • Hadrons: Electrons: n0 < 0 0.2 < ecore < 0.4 n0 > 0 ecore > 0.5 3. HBD 3– central arm matching • straight line projection of central arm track onto HBD • closest HBD hit with A > 16 ADC counts. In electron analysis closest hit cannot be at edge of detector • neighbours with A > 4 pedestal sigma

  4. Central arm: hadrons 3 FB runs (203116, 203142, 203145 ) + |pc3dphi|<0.015 |pc3dze|<7 1508589 + |emcdphi|<0.02 |emcdze|<7 1952985 No Cut 3905411 + n0 <0 1133880 0.4>ecore>0.2 452602 Hbd accp 14866 Integral:11147 In ±2 window: 9254 After bckgd subtr. 8273 14866

  5. A few matching distributions 3 FB runs (203116, 203142, 203145) hadrons electrons RB (203117, 203143) RB 204196+204197 electrons hadrons

  6. Hadron spectra in FB 203116 203142 203145 203146 204195 204198 • Observe in all cases a typical mip pulse height distribution nicely fitted with a Landau distribution • Derive detector gain from the mean of distribution

  7. Detector Gain MPV, Mean and Gain derived from the mip distribution of the different runs Mean (ADC counts) MPV (ADC counts) Gain VGEM = 495 V up to run # 203145 505 V from run # 203146

  8. Hadron spectra in RB 203117 203143 203150 204197 204194 204196

  9. FB RB Landau Fit FB RB Landau Fit Hadron Blindness: RB vsFB Detector gain: 2500 Detector gain: 6600 In each panel the spectra are normalized to represent the same number of hadron tracks in the central arm

  10. Hadrons Cluster size in FB 203116 7.2 % 203142 7% 203145 5.3 % 203146 7.9 % 204195 14.6 % 204198 17.4 %

  11. Hadrons Cluster size in RB 203117 11.5 % 203143 12.4% 203150 8.5 % 204194 35.2% 204196 21.7+/- 1.2% 204197 27.6 %

  12. Electron spectra and cluster size FB (203116+203142+203145) RB (204196+204197) raw backgd subtracted 12

  13. electrons hadrons electrons hadrons Electron - Hadron separation Pulse height Runs 204196 + 204197: B=0, RB 505 V Cluster size

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