Construction of RHIC-STAR TOF and high rating MRPC Wang Yi Department of Engineering Physics, Tsinghua University Beijing,100084, China.

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Construction of RHIC-STAR TOF and high rating MRPC Wang Yi Department of Engineering Physics, Tsinghua University Beijing,100084, China

MRPC ToF barrel RPSD PMD F0SF0S FMSFMS EMC barrel EMC End Cap - DAQ TPC FEE - MTD - Soft  HFT: Si-pixels; IST: Si-strips; FGT: GEM-layers Integrated Tracking Upgrades finished ongoing MTD STAR Detector and Upgrades

MRPC used in STAR barrel TOF Glass: .cm Carbon tape: 100k  / Gas gap: 6×0.22mm Working gas: 95% F134a+5% iso-butane Time resolution: 80 ps Efficiency >90% Rates capability: <1kHz/cm 2 ! 3cm 6cm

Layout of STAR barrel TOF Each tray consists of 32 MRPCs, total number of MRPCs of 126 trays is about 4032.

1/23/45/67/811/12 9/10 1/23/45/67/811/12 9/10 1/23/45/67/ Prod Start 132 MRPCs 768 MRPCs 1856 MRPCs 2944 MRPCs 4032 MRPCs MRPC Production Milestones Beijing, Tsinghua University: 70% of total 4032 modules. Hefei, USTC: the other 30% modules.

STAR MRPC Tsinghua Outer scene of the workshop

Production tools

Time resolution 0f 604 modules

Time resolution of each channel

STAR-TOF PID PID:  /K/p: 1.7 GeV/c p.vs.(  +K): 3 GeV/c Clean electron PID can be obtained up to P T < 3 GeV/c.  This is used to measure the semileptonic decay of open charm.

Semiconductive glass and ceramics Semiconductive glass 210mm*70mm*0.7mm ~10 10 .cm Semiconductive ceramics 80mm*50mm*1mm 10 6 ~10 9 .cm

Resistivity changes with temperature

Efficiency and time resolution as a function of the applied voltage

Efficiency and time resolution The rate capability can reach up to 28kHz/cm 2, while keeping an efficiency larger than 90% and a time resolution below 120ps.

CASA Charge sensitive Amplifier and Shaper Amplifier Similar to PASA, an frontend ASIC developed for ALICE TPC readout, but with some new features: –2pC max. input signals –1-28mV/fC gain, programmable in 13 steps –25-100ns shaping time, programmable in 4 steps 100% IP, full access for fine tuning and optimization for our dedicated applications

Main Functions A frontend ASIC for gas detectors with self-amplification, such as GEM, RPC 16 ch. Preamplifier + CR-(RC) 4 shaper + buffer

Test Results Density –2.44mm x 2.90 mm die size (16 channels) –105  m x 1241  m die area per channel –also in CPGA-84 package, 28.5mm x 28.5mm Static power consumption –141.9 mW in total –8.9mW/ch Crosstalk < 0.98%