Trigger Upgrade of PHENIX Muon Arms for Polarized

Trigger Upgrade of PHENIX Muon Arms for Polarized Sea Quark Measurement and Background Study at s=500 Ge. V RIKEN/RBRC Itaru Nakagawa 1

s=500 Ge. V @ RHIC (LO) Parity Violation Asymmetry Clean flavor separation w/o fragmentation uncertainty 2

Projected Sensitivity @ PHENIX • Full Detector Simulation • S/B ~ 3/1 Assumed • 300 pb-1 and 1300 pb-1 Improvement in momentum resolution is underway 3

Current Muon System • Muon Tracking Chambers – 3 stations of Cathode strip chambers – 3 gaps + 3 gaps + 2 gaps – Each gap has non-stereoplane, stereo-plane, and anode plane – Slow read out -> No trigger • Muon Identifier – 5 layers of Iarocci tubes in x and y directions – 80 cm of steel plate absorber (total) – Provides trigger p > 1. 5 Ge. V Mu. ID B Mu. Tr St#1 St#2 St#3 Same configuration in South 4 4

High Momentum Muon Trigger Run 11 500 Ge. V Projection Rate σtot=60 mb L=1. 5 x 1032 cm-2 s-1 9 MHz BBC Mu. ID Rejection Power RP~100 90 k. Hz RPtot ~ 4500 New Trigger Upgrade RP ~ 45 2 k. Hz PHENIX Band Width for Muon Required Rejection Power w/o Upgrade 5 5

W Trigger System Trigger events with straight track (e. g. Dstrip <= 1) ~10 s Trigger B Mu. Tr FEE Interaction Region 6 Rack Room

W Trigger System Trigger events with straight track (e. g. Dstrip <= 1) Amp/Discri. Transmit 5% Mu. TRG ADTX B Optical 1. 2 Gbps Trigger Mu. TRG MRG Trigger 2 planes 95% Data Merge Mu. TRG Mu. Tr FEE Interaction Region 7 Rack Room

W Trigger System Resistive Plate Counter (RPC) (Φ segmented) Trigger events with straight track (e. g. Dstrip <= 1) RPC FEE Amp/Discri. Transmit 5% Mu. TRG ADTX B Data Merge Optical 1. 2 Gbps Trigger Mu. TRG MRG Trigger 2 planes 95% Mu. TRG Mu. Tr FEE Interaction Region RPC / Mu. TRG data are also recorded on disk. 8 Rack Room

W Trigger System Resistive Plate Counter (RPC) (Φ segmented) Trigger events with straight track (e. g. Dstrip <= 1) Level 1 Trigger Board RPC FEE Amp/Discri. Transmit 5% Mu. TRG ADTX B 1. 2 Gbps Trigger Mu. TRG MRG Trigger 2 planes 95% Mu. TRG Data Merge Optical Trigger Mu. Tr FEE Interaction Region RPC / Mu. TRG data are also recorded on disk. 9 Rack Room

W Trigger System Resistive Plate Counter (RPC) (Φ segmented) Trigger events with straight track (e. g. Dstrip <= 1) Level 1 Trigger Board RPC FEE Amp/Discri. Transmit 5% Mu. TRG ADTX B 1. 2 Gbps Trigger Mu. TRG MRG Trigger 2 planes 95% Mu. TRG Data Merge Optical Trigger Mu. Tr FEE Interaction Region RPC / Mu. TRG data are also recorded on disk. 10 Rack Room

W Trigger System (Final) Resistive Plate Counter (RPC) (Φ segmented) Trigger events with straight track (e. g. Dstrip <= 1) RPC FEE Amp/Discri. Transmit 5% Mu. TRG ADTX B Mu. TRG Data Merge Optical 1. 2 Gbps DCM Trigger Mu. TRG MRG DCM Trigger 2 planes 95% Level 1 DCM Trigger Board Mu. Tr FEE Interaction Region RPC / Mu. TRG data are also recorded on disk. 11 Rack Room

W Trigger Instrumentation in RHIC 2009 run Prototype RPC Mu. TRG absorber Mu. TRG Full Installation to North Arm, 1/2 octant installed to South Demonstrate performance of RPC and Mu. TRG with beam 12 of s=500 Ge. V.

New Mu. TRIG-FEE in North Arm Before Install 2008 Install 13

Mu. TRG system Run 09 performance trigger efficiency vs track momentum Mu. ID trigger threshold plateau efficiency ~ 0. 9 • Mu. ID Algorithm • Track Matching w/ Mu. ID • Timing cut w/ RPC • Track Matching w/ RPC • Background Shields • etc. . � 14 14

LL 1 Trigger Readiness • • Mu. TRG-MRG Boards LL 1 Board Communication test LL 1 Board Production by end of October ADTX - MRG - LL 1 - GL 1 chain test this November. New high momentum trigger will be operated in Run 10 for 15 commissioning

Installation to South Muon Arm • Post Run 9 Shutdown • Nearly Completed! • To be Commissioned in Run 10 Au-Au Run 16

Road Map to Run 11 Production Run Prototype RPC Mu. TRG absorber Run 9 Mu. TRG 17

Road Map to Run 11 Production Run RPC 3 Mu. TRG Run 10 18

Road Map to Run 11 Production Run RPC 3 Mu. TRG absorber Run 11 Mu. TRG 19

Final Muon Trigger Configuration RPC 3 Mu. TRG absorber Mu. TRG RPC 1 Run 12 20

Summary • Seak Quark Polarization Measurement @ PHENIX via W-Boson • High Momentum Muon Trigger is close to finish installation to Mu. TR FEE. • Run 09 Commissioning demonstrated good efficiency&rejection factor. • Even more improvements are expected from – RPC (Timing & Matching) – Mu. ID Algorithm – Background Shields PHENIX Muon Arms are getting ready for pp Production at 500 Ge. V in Run 11 21

Backup Slides 22

High Momentum Muon Trigger rejection (Mu. ID&BBC/BBC(nvtx)) Mu. ID rejection in 200 Ge. V and 500 Ge. V 200 150 100 50 New Trigger Upgrede 0 0 • • • 0. 5 1. 0 1. 5 2. 0 BBC(nvtx) (estimated from ZDC narrow) MHz σtot=60 mb, L=1. 5 x 1032 cm-2 s-1 – rate = 9 MHz DAQ rate limit < 2 k. Hz (for muon Arm) Therefore, required rejection power 2250 Mu. ID rejection power (RP) at 4. 5 MHz < 50 Additional RP~50 necessary Run 11 500 Ge. V Projection w/o Upgrede 23 23

Optical Alignment System Intrinsic Mu. TR Resition ~100 m Presentry 200 ~ 300 m ` Yuki Ikeda and Kazufumi Ninomiya, Rikkyo University 24

OASys Monitoring Thru Run 09 Motion to phi IR Temperature Motion to r 25

Vector and Magnitude of Motion 26

Mu. TR Cross Talk 27

A possible cross talk senario +HV GND 1. Particle hit the chamber and generate a electronion pairs in chambers. 2. Electrons are collected by anode wire(s). It induces charge in near-by cathode strip(s) 3. Collected anode charge does not have any path to escape in the anode circuit (high impedance). 4. Other cathode strips induce same-sign charge in the strips, thus opposite sign charge in anode. 5. After shaping, FEE sees cross-talk signals in opposite phase. 28 28

Rates per strip at 500 Ge. V (CLK trig) Average Station 1 Station 3 Station 2 Maximum Station 1 Station 3 Station 2 29

Why this is bad? Mu. Tr cathode signal Baseline-baseline ~10 sec Rate >100 k. Hz at BBC=1 MHz in 500 Ge. V pp. Pile-up regime ! Big pulse cause cross Talks btwn strips? 30 30

Pedestal – ADC(3) Hit distribution (200 Ge. V, zerosup OFF) Zero Suppression Gap 2 Gap 3 Gap 1 Stereo Gap 1 Non. Stereo Gap 2 Non. Stereo Gap 3 Non. Stereo mutr_strip_event 000978_clk 2424488676 q Strip 31 31

Mu. TR Rates/Strip @ 500 Ge. V Average Station 1 Low energy hits from beam pipe? Large pulse ( 20 MIP) in Mu. TR Station 3 Possbile cross talk causes high rate Investigate sources Station 2 Maximum Station 1 Station 3 Station 2 Mu. TR Station-1 32

Mu. ID on High Rates RPC 3 33 Gap 1, 2, 3, 4, 5 shield • Drawing Current Saturation at high rate. Efficiency • Gap 1, Gap 5 > Gap 2, Gap 3, Gap 4 RPC for Trigger More Shielding?