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Performance of PHENIX High Momentum Muon Trigger

Performance of PHENIX High Momentum Muon Trigger .  . sqrt(s)=500 GeV @ RHIC. Parity Violation Asymmetry Clean flavor separation w/o fragmentation uncertainty. PHENIX Detector. New MuTRIG-FEE in North Arm .  Before Install. 2008 Install . High Momentum Muon Trigger. New Trigger

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Performance of PHENIX High Momentum Muon Trigger

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  1. Performance of PHENIX High Momentum Muon Trigger

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

  3. PHENIX Detector

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

  5. 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

  6. 陽子 陽子 衝突により陽子が粉砕された現象を観測

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

  8. 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

  9. 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

  10. BBC

  11. PHENIX Detector • 2 central arms: electrons, photons, hadrons • charmonium J/, ’-> e+e- • vector mesonr, w,  -> e+e- • high pTpo, p+, p- • direct photons • open charm • hadron physics • 2 muon arms: • “onium” J/, ’,  -> m+m- • open heavy flavor • W-> m (500GeV) Excellent trigger and DAQ capabilities: multiple trigger signature important for spin physics can be taken in parallel with high bandwidth!

  12. Beam-Beam Counter (BBC) South North ⊿η = 3.1 ~ 4.0 ⊿φ = 2π 144.35 cm

  13. Purpose of PHENIX BBC Collision Vertexinitial point of charged particle tracking Centrality Determination Impact Parameter Determination with ZDC Each element is assembled byQuartz Cherenkov radiator(bth=.7) and meshed dynode PMT. Minimum Bias TriggerLevel1 Trigger with Online Vertex Cut Time-Zero DeterminationStart Timing for ToF Measurements Reaction Plane DeterminationDirection of Impact Parameter

  14. L L ZDC triggered • Z-Vertex • Time zero BBLL1 Selected (ZDC&BBLL1) Z-Vertex and Time zero BBC South BBC North Vertex position TN TS TN/S : average hit time, c : light velocity, L : 144.35 cm

  15. Rejection Power • Rejection Power = BBC(no vertex) / SG1 trigger BBC: Beam-Beam Counter BBCLL1(>0 tubes) novertex MUON_S_SG1&BBCLL1(noVtx) MUON_N_SG1&BBCLL1(noVtx) MUON_S_SG1_RPC3_1_B||C MUON_N_SG1_RPC3_1_B||C MUON_S_SG1_RPC3A&MUID_S1D MUON_N_SG1_RPC3A&MUID_N1D

  16. Run Database

  17. Getting BBC Rate 1.7MHz

  18. Rejection Power vs. BBC Rate

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