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sqrt(s)=500 GeV @ RHIC
Parity Violation AsymmetryClean flavor separationw/o fragmentation uncertainty
2
7
High Momentum Muon TriggerRun11 500 GeV Projection
New TriggerUpgrade
MuIDTrigger
Rate
9 MHz
90 kHz
σtot=60mb
L=1.5x1032cm-2s-1
BBCMuID Rejection PowerRP~100
Trigger UpgradeRP ~ 45
2 kHzPHENIX Band Width for Muon
Required Rejection Power
RPtot ~ 4500
1. High Rejection Power2. High Efficiency
W
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 triggerLogic
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 madeBottom Line
~10s
12
High Momentum Muon Trigger System
MuTRGADTX
MuTRGMRG
Level 1TriggerBoard
MuTrFEE
Resistive Plate Counter(RPC) (Φ segmented)
B
2 planes
5%
95%
Trigger
Trigger
Trigger
Interaction Region Rack Room
Optical
1.2Gbps
Amp/Discri.Transmit
DataMerge
MuTRG
RPCFEE
Trigger events with straight track(e.g. Dstrip <= 1)
RPC / MuTRG data arealso recorded on disk.
SG1
DCM
• 2 central arms: electrons, photons, hadrons– charmonium J/, ’ -> e+e-
– vector meson , , r w -> e+e- – high pT po, p+, p-
– direct photons– open charm – hadron physics
• 2 muon arms: – “onium” J/, ’, -> m+m- – open heavy flavor– W -> m (500GeV)
Excellent trigger and DAQcapabilities: multiple trigger
signature important for spin physics can be taken in parallel with high
bandwidth!
PHENIX Detector
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 DeterminationDirection of Impact
Parameter
Centrality Determination
Impact Parameter Determination with ZDC
Each element is assembled byQuartz Cherenkov radiator(bth=.7)and meshed dynode PMT.
BBLL1Selected(ZDC&BBLL1)
ZDC triggered
Z-Vertex and Time zero
TN/S : average hit time, c : light velocity, L : 144.35 cm
• Z-Vertex
• Time zero
BBC North
BBC South LL
Vertex position TNTS
Rejection Power
• Rejection Power = BBC(no vertex) / SG1 trigger
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MUON_S_SG1&BBCLL1(noVtx)MUON_N_SG1&BBCLL1(noVtx)MUON_S_SG1_RPC3_1_B||CMUON_N_SG1_RPC3_1_B||CMUON_S_SG1_RPC3A&MUID_S1DMUON_N_SG1_RPC3A&MUID_N1D
BBCLL1(>0 tubes) novertex
BBC: Beam-Beam Counter