115th CBM collaboration meeting, GSI, Darmstadt, Germany, April 12-16, 2010
Wang Yi, Tsinghua University
and high rate MRPC
High rate MRPC and beam test results
Summary
15th CBM collaboration meeting, GSI, Darmstadt, Germany, April 12-16, 2010
Wang Yi, Tsinghua University
Heavy ion collision from 2-35Gev:
We can study phase structure of strongly interacting baryon rich matter.
Particle ID
Muons: STS + MUCH + TOF
A very good resolution of TOF is essential to get good PID at high ρB.
CBM Physics topics
QCD critical endpoint
Onset of chiral symmetry restoration at high ρB
*
15th CBM collaboration meeting, GSI, Darmstadt, Germany, April 12-16, 2010
Wang Yi, Tsinghua University
Efficiency > 95 %
15th CBM collaboration meeting, GSI, Darmstadt, Germany, April 12-16, 2010
Wang Yi, Tsinghua University
– Center: pad-readout
Outside: strip-readout
CBM-TOF requirement
15th CBM collaboration meeting, GSI, Darmstadt, Germany, April 12-16, 2010
Wang Yi, Tsinghua University
15th CBM collaboration meeting, GSI, Darmstadt, Germany, April 12-16, 2010
Wang Yi, Tsinghua University
Specifications:
15th CBM collaboration meeting, GSI, Darmstadt, Germany, April 12-16, 2010
Wang Yi, Tsinghua University
Performance test of glass
This glass was applied with 1000V for about 32days, integrated charge: 1 C/cm2
--roughly corresponding to the CBM life-time over 5 years operation at the maximum particle rate.
Resistivity decreases with temperature
15th CBM collaboration meeting, GSI, Darmstadt, Germany, April 12-16, 2010
Wang Yi, Tsinghua University
Colloidal graphite: 2M /
iso-butane+1%SF6
15th CBM collaboration meeting, GSI, Darmstadt, Germany, April 12-16, 2010
Wang Yi, Tsinghua University
15th CBM collaboration meeting, GSI, Darmstadt, Germany, April 12-16, 2010
Wang Yi, Tsinghua University
2mm
15th CBM collaboration meeting, GSI, Darmstadt, Germany, April 12-16, 2010
Wang Yi, Tsinghua University
iso-butane+0.5%SF6
15th CBM collaboration meeting, GSI, Darmstadt, Germany, April 12-16, 2010
Wang Yi, Tsinghua University
PMT: 0.8-20 kHz/cm2
MRPC: 2-30 kHz/cm2
Charge distributions of the 10-gap RPC for different particle fluxes at 2.64 kV/gap
15th CBM collaboration meeting, GSI, Darmstadt, Germany, April 12-16, 2010
Wang Yi, Tsinghua University
Performance of high rate MRPC
Efficiency and time resolution as a function of high voltage at a rate of about 800Hz/cm2
When the particle flux increases every 5 kHz/cm2, the efficiency decreases by 1% and the time resolution deteriorates by 4 ps.
15th CBM collaboration meeting, GSI, Darmstadt, Germany, April 12-16, 2010
Wang Yi, Tsinghua University
Colloidal graphite: 1M /
15th CBM collaboration meeting, GSI, Darmstadt, Germany, April 12-16, 2010
Wang Yi, Tsinghua University
15th CBM collaboration meeting, GSI, Darmstadt, Germany, April 12-16, 2010
Wang Yi, Tsinghua University
15th CBM collaboration meeting, GSI, Darmstadt, Germany, April 12-16, 2010
Wang Yi, Tsinghua University
15th CBM collaboration meeting, GSI, Darmstadt, Germany, April 12-16, 2010
Wang Yi, Tsinghua University
Rpcy (cm)
2
3
1
15th CBM collaboration meeting, GSI, Darmstadt, Germany, April 12-16, 2010
Wang Yi, Tsinghua University
Rpcy (cm)
2
3
1
15th CBM collaboration meeting, GSI, Darmstadt, Germany, April 12-16, 2010
Wang Yi, Tsinghua University
~ 54ps/cm
15th CBM collaboration meeting, GSI, Darmstadt, Germany, April 12-16, 2010
Wang Yi, Tsinghua University
Efficiency>95%, Time resolution: ~80ps
MRPC-pad readout: 10-gap, silicate glass
HV scan at 800 Hz/cm2
Efficiency>95%, Time resolution: <70ps
Rate capability: 25 kHz/cm2
Efficiency: ~97%,
15th CBM collaboration meeting, GSI, Darmstadt, Germany, April 12-16, 2010
Wang Yi, Tsinghua University
Next steps
Improve the production architecture of low resistive glass to increase the yield.
Develop large prototype of high rate MRPC (pad or strip)
Optimize the design of 1m long strip counter
Beam test….
Thank You!