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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. 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

  12. SG1 Chain 1 9 6 5 4 2 8 7 FPGA FPGA 3 Threshold Mask MRG MTP casset MTP fiber LL1 ADTX 10 DCMIF DCM

  13. Threshold Scan Plot by Dahee Threshold change every stations all together. North SG1_South Rate [Hz] Threshold change only station-3a MRG#80 (rests are fixed at 40mV). Threshold [mV] • The threshold scan result indicates clear threshold dependence. • The slope somewhat gets shallow between 30mV to 60mV. • Compared to North, South rate responses quite shallow and not normal response.

  14. Difference between Previous and Current MRG FPGA code Upgrade : March 28, 2012 Run12: March 18 ~ April 18, 2012

  15. SG1 Octant-3 High Rate Excursion Plot by SeYoung (Ewha University) 20kHz Frequency stays reasonably constant, whereas amplitudes vary by factor of 6 or so.

  16. Peak to Peak Intervals Plot by Dahee Intervals are constant within +/- 30 seconds. However their variations can not be explained within the peak position error.

  17. Run13 Threshold Response of Octant-1 Run12 Octant-1 Cosmic SG1~50kHz Run12 Octant-1 Physcs SG1~1kHz South Plot by Dahee (Ewha University) North Run12 Cosmic Rate ~40kHz is consistent with present measurement. Physics run was operated at 30mV and likely to be operated around 1kHz.

  18. Physics Introduction and Muon Trigger System

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

  20. 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

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

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

  23. For more information • S. Adachi, et. al., Nuclear Inst. and Methods in Physics Research, A (2013), pp. 114-132

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