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Performance of PHENIX High Momentum Muon Trigger

Performance of PHENIX High Momentum Muon Trigger . Muon Tracker. 3. 2. 4. 5. 1. 6. 8. 7. Octant number. MuTR FEE Upgrade . Charge Sharing with multilple strips provides ~200um resolution out of 5mm strips

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Performance of PHENIX High Momentum Muon Trigger

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  1. Performance of PHENIX High Momentum Muon Trigger

  2. Muon Tracker 3 2 4 5 1 6 8 7 Octant number

  3. MuTR FEE Upgrade Charge Sharing with multilple strips provides ~200um resolution out of 5mm strips Fast readout electronics process signal fast enough before trigger decision is made Bottom Line Readout Analog Signal to Get the Position of Particle Passage (OFFLINE Analysis) Readout Analog Signal to Get the Position of Particle Passage (OFFLINE Analysis) Get Digital Signal for Trigger Decision (ONLINE) To trigger Logic ~10s 0.05Q ADC Q 0.95Q

  4. Resistive Plate Counter (RPC) (Φ segmented) B High Momentum MuonTrigger System Trigger events with straight track (e.g. Dstrip <= 1) SG1 Level 1 Trigger Board Trigger RPC FEE MuTRG Data Merge Amp/Discri. Transmit Trigger 5% Optical MuTRG MRG DCM MuTRG ADTX 1.2Gbps Trigger 2 planes RPC / MuTRG data are also recorded on disk. MuTr FEE 95% Interaction Region Rack Room

  5. Threshold Scan • Good correlation between threshold and N.SG1. 1Hz is reasonable true cosmic rate. • Poor correlation between threshold and S.SG1. Not rates are not reproducible.

  6. North Threshold Scan

  7. All Octants (Thr=40mV) SG１South Trigger Rate Expected trigger rate for cosmic ~1Hz] Measurement and study by SeYoung and Dahee

  8. Masking Octant-1 (Thr=40mV) 20min Study by Dahee and SeYoung

  9. Oct-1 Effect

  10. Observation So Far • Octant-1 which has intrinsic eigenvalue of 300Hz@40mV. •    This high rate quenches completely by masking octant-1. Masking at LL1 or MRG doesn't matter. • Rate excursion up to >10kHz with 5 -10 minutes of lifetime originated Octant-3. Excursion repeats during the run.

  11. Threshold Response of SG1.S Rate SOUTH SG1 w/o Oct-3 NORTH SG1

  12. Oct-1 HighRate Oct-3 Excursion Logic Test ADTX MRG LL1 GL1 yes yes ✖ ✖ ✖ High Threshold mask mask ADTX MRG LL1 GL1 no no no yes ADTX MRG 10-13min LL1 GL1 no no no no no no no yes yes no yes yes ~60min ADTX MRG LL1 GL1 no no yes

  13. Octant-3 High Rate Time Structure

  14. Physics Introduction and Muon Trigger System

  15.  sqrt(s)=500 GeV @ RHIC Parity Violation Asymmetry Clean flavor separation w/o fragmentation uncertainty

  16. High Momentum Muon Trigger New Trigger Upgrade Run11 500 GeV Projection σtot=60mb L=1.5x1032cm-2s-1 Rate 9 MHz BBCMuID Rejection Power RP~100 Trigger Upgrade RP ~ 45 90 kHz W RPtot ~ 4500 2 kHz PHENIX Band Width for Muon Required Rejection Power MuID Trigger High Rejection Power High Efficiency

  17. New MuTRIG-FEE in North Arm  Before Install 2008 Install

  18. Diagnosis Fiber swap btwn MRG&LL1 Antimask all octants✔ Threshold scan.✔ Angular distribution of cosmic✔

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