1. MRPC -High Time Resolution Detector R&D at USTC CHINA Chen, Hongfang 2001/Oct.
Oct.2001, Beijing
MRPC，USTC

2. Introduction 1. Excellent Time Resolution.
Particle identification for the experiment is a key ingredient .
To identify particle in the momentum range GeV/c ,
a time of flight array should have following characters:
1. Excellent Time Resolution.
TOF time resolution of ps will much
expending the PID momentum range.
2. The time of flight detector should to be segmented as
needed.
3. Large Area and Low Cost
Multi-gap resistive plate chamber (MRPC) based on the technology developed at CERN LAA , Alice group. It will be much cheaper than using scintillating detector. .
Oct.2001, Beijing.

3. Working Principle of Multi-gap Resistive Plate Chamber
Oct.2001, Beijing
MRPC，USTC

4. R&D at USTC 1. The Single Cell MRPC inner glass 4. 4 cm2 ,electrode 3
R&D at USTC 1.The Single Cell MRPC inner glass 4*4 cm2 ,electrode 3*3cm2 built at USTC in Sept. 2000
Oct.2001, Beijing
MRPC，USTC

5. MRPC Beam Test at CERN Starting Time Resolution: start ~30ps
Beam Size: ~ 1.5 mm,
Momentum: 7GeV/c
USTC
Oct.2001, Beijing
MRPC，USTC

6. T-A correlation of single cell MRPC(5 gaps 0
T-A correlation of single cell MRPC(5 gaps 0.22mm) Beam Test at CERN Nov ( Working gas 90% Freon+5%i-C4H10,5%SF6)
Oct.2001, Beijing
MRPC，USTC

7. Single cell MRPC time after T-A correction ( inner glass 4
Single cell MRPC time after T-A correction ( inner glass 4*4 cm2 electrode 3*3cm2 )
Oct.2001, Beijing
MRPC，USTC

8. Efficiency and time resolution along horizontal position ( inner glass 4*4 cm2 electrode 3*3cm2 )
Oct.2001, Beijing
MRPC，USTC

9. Efficiency and time resolution VS. HV and threshold ( inner glass 4
Efficiency and time resolution VS. HV and threshold ( inner glass 4*4 cm2 electrode 3*3cm2 )
Oct.2001, Beijing
MRPC，USTC

10. 2. 2. 6 pad MRPC side view-1 gap : 0. 25 mm USTC(2
2. 2*6 pad MRPC side view gap : 0.25 mm USTC(2.2) April outer glass 1.8mm, inner glass 0.7mm (made in Shanghai) pad size 3.1*3 cm
Oct.2001, Beijing
MRPC，USTC

11. 2*6 pad MRPC side view-2 gap : 0.25 mm
Oct.2001, Beijing
MRPC，USTC

12. The Pad of the Chamber pad size 3*3.1cm, gap between pad 0.3cm
Oct.2001, Beijing
MRPC，USTC

13. The MRPC with 2*6 pad
Oct.2001, Beijing
MRPC，USTC

14. Efficiency,time resolution and time walk as a function of applied HV for pad-4 of the MRPC (USTC 2.2)
Oct.2001, Beijing
MRPC，USTC

15. Result of the 6*0.25mm MRPC
Oct.2001, Beijing
MRPC，USTC

16. Result of the 6*0.25mm MRPC
Oct.2001, Beijing
MRPC，USTC

17. Efficiency and time resolution as a function of position (X scan for pad 2 and pad 3)
Oct.2001, Beijing
MRPC，USTC

18. Efficiency and time resolution along Z scan for pad 1 of the MRPC USTC 1.0.0
Oct.2001, Beijing
MRPC，USTC

19. p -π identification testing at T-10 (d=277cm)
Oct.2001, Beijing
MRPC，USTC

20. 3. Structure of the ‘double’ MRPC(USTC 3. 2) gap : 0
3. Structure of the ‘double’ MRPC(USTC 3.2) gap : 0.22mm , tested at CERN June cathode(outer electrode) -HV, anode(middle electrode) +HV signal of cathode connect together, signal of anode connect together
Oct.2001, Beijing
MRPC，USTC

21. Raw time distribution and T-A correlation 5*0.22mm gap double chamber
Oct.2001, Beijing
MRPC，USTC

22. Time distribution after T-A correction
Oct.2001, Beijing
MRPC，USTC

23. Efficiency/Time resolution vs. HV
Oct.2001, Beijing
MRPC，USTC

24. Efficiency at different position
Oct.2001, Beijing
MRPC，USTC

25. Effect of inclined beam / 1
Effect of inclined beam / 1. Inclined in Φ direction ____ ____ a) Hit near the center of pad with 6*0.22mm RICE Left: Φ=0o ,σ=67.8ps; Right: Φ=20o, σ=70.5ps
Oct.2001, Beijing
MRPC，USTC

26. b) beam hit at near the edge of pad with 6. 22mm RICE Left: Φ=0o ,σ=77
b) beam hit at near the edge of pad with 6*0.22mm RICE Left: Φ=0o ,σ=77.5ps; Right: Φ=20o, σ=90.8ps
Oct.2001, Beijing
MRPC，USTC

27. 2. Effect of inclined beam in θ \ (near the center of pad, with 6
2. Effect of inclined beam in θ \ (near the center of pad, with 6*0.22mm RICE) _____ Left: θ =0o ,σ=63.7ps; Right: θ =20.5o, σ=65.3ps
Oct.2001, Beijing
MRPC，USTC

28. Oct.2001, Beijing
MRPC，USTC

29. Oct.2001, Beijing
MRPC，USTC

30. From the CERN PS test beam data.
SUMMARY
Properties of MRPC
From the CERN PS test beam data.
Time resolution Efficiency
6*0.25mm gap σ~60-70 ps , >97%
2*5*0.22 mm gap ps >99%
Oct.2001, Beijing
MRPC，USTC

31. Some Comment Alice TOF module : active area ~120*10cm2 , 6 gaps
pad size : 3.5*2.5 cm2
=60-70 ps , >97% for MIPs
Active area 160*12cm2, pad 160*5 cm2 (P. Fonte I-LIP Portugal) 2 *2gaps 0.3mm
=50-80 ps , >95% for MIPs
position resolution along the strip ~1.2 cm
Proposal for BES endcap TOF
Oct.2001, Beijing
MRPC，USTC