1 beam test results of ustc lmrpc modules (50cm) yongjie sun presnted by hongfang chen
TRANSCRIPT
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Beam Test Results of
USTC LMRPC modules (50cm)
Yongjie Sun
presnted by Hongfang Chen
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Outline
Long-strip MRPC structure Results of August beam test at GSI Summary
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MRPC structure (endview)
5 x 250μm gaps
5 x 250μm gaps
Readout strips
HV
2.5cm
Readout strips: 2.5 cm x 50 cmHV electrode: Licron spray ~40 MΩ/□
Made of window glass of 0.7 mm thick
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MRPC #1 (topview)
55 cm
24.1cm
2.5cm
0.6cm
Gaps between strips: 0.6 cm
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MRPC #2 (topview)
Top/bottom pcb
The readout strips are “hollowed-out” alternately.
Removed: 5 mm x 4
Left: 1 mm x 5
Removed: 2.5 mm x 9
Left: 0.25 mm x 10
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MRPC #3 (topview)
55 cm
24.1cm
2.5cm0.7cm
Gaps between strips: 0.7 cm (upper part)
0.8 cm (lower part)
0.8cm
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6m
Setup
ProtonBeam
Pb
2m
42 cmPMT 1,2PMT 3,4
PMT 5,6TSU MRPC
USTC MRPC
Platform PlatformPlatform
xy
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Photo of the setup
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DAQ Logic
T
D
C
Q
D
C
PMT 1-4(5)
DiscriminatorNIMECL VULOM, Logic
Delay NIMECL
LMRPC1-6 (left)7-12(right)
FEE
Delay Discriminator NIMECL
Delay
Delay
Gate
Trigger area: 2 cm x 4 cm (without back_scint.)
STOP
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ADC1 ADC2
ADC3 ADC4
PMT calibration<
t 1-(
t 3+
t 4)/
2>
ADC1
<t 2
-(t 3
+t 4
)/2>
ADC2
<t 3
-(t 1
+t 2
)/2>
ADC3 ADC4
<t 4
-(t 1
+t 2
)/2>
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((t3+t4)-(t1+t2))/4
Resolution~67 ps
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T-(t1+t2+t3+t4)/4
T-(t1+t2+t3+t4)/4
T-(
t1+
t2+
t3+
t4)/
4
ADC
<T-(
t1+
t2+
t3+
t4)/
4>
ADC
MRPC CalibrationIntrinsic timing resolution = 67 ps (including momentum spread)
HV=7kV
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Efficiency and resolution plateau
67 ps
97%
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Position scan (±7 kV)
No significant efficiency drop in the gap
Trigger Area: 2 cm wide
From both “charge sharing” and cross talk.
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Valid TDCs and valid QDCs (3 sigma above pedestal)Valid TDCs
Cross TalkMRPC #1
Trigger on the strip center:“Cross talk” at neighbor strips: <~3%
Trigger Area: 2 cm wide
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Cross TalkMRPC #2
Valid TDCs and QDCs
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Efficiency vs. PositionMRPC #2
Valid TDCs
HV= 7kV
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Valid TDCs and valid QDCs (3 sigma above pedestal)
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Cross TalkMRPC #3
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Efficiency vs. PositionMRPC #3
Valid TDCs
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Track information using the data of SSD
the following analysis is based on the instruction of : Y.P. Zhang,P.-A. Loizeau Data structure of final NTUPLE and a short description about how to use the silicon tracking system
the data files used : run_0005.root, run_0006.root, ......, run_0020.root,where the USTC-MRPC was settled at the same position. run_0021.root, the MRPC moved by 12mm.
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Hits position profile on MRPC
the profile is about 3cm x 2 cm
the following analysis will base on these SSD position cuts and charge cuts
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Tranverse profile-- efficiency vs positionfor MRPC#1
run0005-0020
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Efficiency vs Positionfor MRPC#1
data file, run_0021.root
edge effects
6mm-gap
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Combined data
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Summary
The cross talk for neighbour strip ~3%for modules MRPC#1, 2, 3. (50cm strip)
Next step 1m long strip
Thank You !
谢谢!
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Signal Charge vs Position
near the edge of stripat the middle of strip
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Time Resolution of PMT timing
( (t3+t4)-(t1+t2) )/4
after T-A correction
Sigma(pmt) = 2.08 *35ps = 73ps
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RPC time resolution
cuts: SSD cust PMT cuts
resolution:sigma(rpc) = 69 ps
35ps/ch
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Hit tranverse profile
position distribution
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pmt resolution vs position
((t3 + t4) - (t1 + t2) )/4
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rpc
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rpc resolution vs position
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eff and reo vs position
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Longitudinal
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edge effects
the profile is also quite clear,
and we can see that the beam hits between two strips of the MRPC
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(2) pmt cuts: pmt-pair charge: q1+q2, q3+q4 take out 5% at the low range side, and take a
nother 25% at the high range side time difference: T1-T2, T3-T4 2.5%, 2.5% position difference: (T1-T2)-(T3-T4) 2.5%, 2.5% time of flight: ((T3+T4)-(T1+T2))/4 0.5%, 0.5%
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edge effects