1. RPC with strip readout Last results from test of timing glass
IHEP+JINR
2nd PANDA Russia Workshop, 27 April 2010

2. A little bit of history about JINR+IHEP efforts

3. The PANDA Workshop, ITEP MOSCOW, April 17-18 2008/
The PANDA Workshop, ITEP MOSCOW, April

4. Strips with double ended readout. Strip length ~30 cm
11-14 identical MRPCs.
Strips with double ended readout.
Strip length ~30 cm
If strip width is 3 cm, one module
contains 64 strips.
Total active area ~ 6.4 m2.
Signal is amplified and digitized at RPC.
The PANDA Workshop, ITEP MOSCOW, April

5. The PANDA Workshop, ITEP MOSCOW, April 17-18 2008
4 gap glass RPC inside
The PANDA Workshop, ITEP MOSCOW, April

6. Thickness of six-gap RPC made of 0.6 mm glass plates
material
X0(mm)‏
thickness (mm)‏
X/X0 (%)‏
glass
127
8x0.6
3.83
aluminium 89
2x1
2.22
copper
14.4
0.1
0.69
mylar
287
0.6
0.21
kapton
286
0.25
~0.10
SUM
~ 7 % 6 6 6

7. 6 gap RPC prototype tested with beam at IHEP

8. RPC resolution and efficiency vs. applied voltage
HV=9kV, time resolution ~45ps, efficiency above 98%
Time-charge correction
RPC+”RPC FEE1”
developed for FOPI RPC
Jülich, XXX PANDA meeting, 2009 8 8 8

9. Main results from test done in2008
Very first steps have been done. Time resolution of ~50 ps can be obtained with 6-gap glass MRPC having strips with width
of 25mm.
Neither efficiency nor resolution depends on position along strip.
With double end readout a spatial resolution along a strip is not
worse than 1 cm.
If a coordinate along strip is known (say, from a tracker) a one-end strip readout is enough to provide with good timing resolution. Number of readout channels in this case can be reduced by 2.
Jülich, XXX PANDA meeting, 2009 9 9 9

10. TIME-OVER-THRESHOLD METHOD.
BEAM TEST OF 6 GAP RPC.
TIME-OVER-THRESHOLD METHOD.
2009: RPC+NINO(ALICE)+HPTDC(100psec/count, Dubna)
2010: RPC+TRB-HADES (improved TOT + 100psec HPTDC)
2nd PANDA Russia Workshop, 27 April 2010

11. 2009: ENDS OF A STRIP ARE NOT LOADED WITH RESISTORS
time
width
Multiple reflections
width
2nd PANDA Russia Workshop, 27 April 2010

12. 2009: RESISTOR AT END OF A STRIP MATCHES
THE IMPEDANCE OF THE TRANSMISSION LINE.
time
width
Two ends of
the same strip
width
2nd PANDA Russia Workshop, 27 April 2010

13. Time-width correction for the slewing time
2009: RESISTOR AT END OF STRIP IS TAKEN IN CORRESPONDANCE
WITH THE IMPEDANCE OF STRIP LINE.
Time-width correction
for the slewing
time
width
Final result: after subtraction
of trigger jitter the resolution
is σ ≈ 120 psec
2nd PANDA Russia Workshop, 27 April 2010

14. 2010: RPC+TRB_HADES Resolution vs HV very preliminary Efficiency vs HV
2nd PANDA Russia Workshop, 27 April 2010

15. WE DO NOT UNDERSTAND HOW HPTDCs WORK !!!
Tests of HPTDC with a pulser: time jitter of
measured signal dependently to delay between
signal and “common stop”
HPTDC from Dubna
HPTDC from HADES
2nd PANDA Russia Workshop, 27 April 2010