Performance of PHENIX High Momentum Muon Trigger 1

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

PHENIX Detector 3

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

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7 High Momentum Muon Trigger Run GeV Projection New Trigger Upgrade MuID Trigger Rate 9 MHz 90 kHz σ tot =60mb L=1.5x10 32 cm -2 s -1 BBC  MuID Rejection Power RP~100 Trigger Upgrade RP ~ 45 2 kHz PHENIX Band Width for Muon Required Rejection Power RP tot ~ High Rejection Power 2.High Efficiency 1.High Rejection Power 2.High Efficiency W

陽子 衝突により陽子が粉砕された現象を観測 8

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Muon Tracker Octant number 10

11 MuTR FEE Upgrade Readout Analog Signal to Get the Position of Particle Passage (OFFLINE Analysis) Get Digital Signal for Trigger Decision (ONLINE) Readout Analog Signal to Get the Position of Particle Passage (OFFLINE Analysis) To trigger Logic ADC 0.95Q 0.05Q Q 1.Charge Sharing with multilple strips provides ~200um resolution out of 5mm strips 2.Fast readout electronics process signal fast enough before trigger decision is made Bottom Line ~10  s

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

BBC 13

2 central arms: electrons, photons, hadrons – charmonium J/ ,  ’  e  e  – vector meson   e  e  – high p T       – direct photons – open charm – hadron physics 2 muon arms: – “onium” J/ ,  ’,      – open heavy flavor – W  (500GeV) Excellent trigger and DAQ capabilities: multiple trigger signature important for spin physics can be taken in parallel with high bandwidth! PHENIX Detector

Beam-Beam Counter (BBC) NorthSouth cm ⊿ η = 3.1 ~ 4.0 ⊿ φ = 2π

Purpose of PHENIX BBC Collision Vertex initial point of charged particle tracking Minimum Bias Trigger Level1 Trigger with Online Vertex Cut Time-Zero Determination Start Timing for ToF Measurements Reaction Plane Determination Direction of Impact Parameter Centrality Determination Impact Parameter Determination with ZDC Each element is assembled by Quartz Cherenkov radiator(  th =.7) and meshed dynode PMT.

BBLL1 Selected (ZDC&BBLL1) ZDC triggered Z-Vertex and Time zero T N/S : average hit time, c : light velocity, L : cm Z-Vertex Time zero BBC North BBC South LL Vertex position TNTN TSTS

Rejection Power Rejection Power = BBC(no vertex) / SG1 trigger 18 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 BBCLL1(>0 tubes) novertex BBC: Beam-Beam Counter

Run Database 19

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Getting BBC Rate MHz

Rejection Power vs. BBC Rate 22