mrpc beam test @ gsi yongjie sun university of science and technology of china
TRANSCRIPT
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MRPC Beam Test @ GSI
Yongjie Sun
University of Science and Technology of China
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14th CBM collaboration meeting 206 Oct. 2009
Index
Test setup Preliminary results of 3 prototypes Summary
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14th CBM collaboration meeting 306 Oct. 2009
Accelerator
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14th CBM collaboration meeting 406 Oct. 2009
Setup
Our Beam Test Experiment
FOPI at Cave B
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14th CBM collaboration meeting 506 Oct. 2009
6m
Setup
ProtonBeam
Pb
2m
42 cmPMT 1,2PMT 3,4
PMT 5,6TSU MRPC
USTC MRPC
Platform PlatformPlatform
xy
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14th CBM collaboration meeting 606 Oct. 2009
Photo of the setup
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14th CBM collaboration meeting 706 Oct. 2009
Beam
Proton beam,Kinetic energy: 3.5 GeV/c
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14th CBM collaboration meeting 806 Oct. 2009
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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14th CBM collaboration meeting 906 Oct. 2009
Index
Test setup Preliminary results of 3 prototypes Summary
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14th CBM collaboration meeting 1006 Oct. 2009
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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14th CBM collaboration meeting 1106 Oct. 2009
MRPC #1 (topview)
55 cm
24.1cm
2.5cm
0.6cm
Gaps between strips: 0.6 cm
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14th CBM collaboration meeting 1206 Oct. 2009
MRPC #1
+iso-butane 5%+Freon
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14th CBM collaboration meeting 1306 Oct. 2009
ADC1 ADC2
ADC3 ADC4
<t 1
-(t 3
+t 4
)/2>
ADC1
<t 2
-(t 3
+t 4
)/2>
ADC2
<t 3
-(t 1
+t 2
)/2>
ADC3ADC4
PMT calibration
<t 4
-(t 1
+t 2
)/2>
((t3+t4)-(t1+t2))/4
Resolution~67 ps
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14th CBM collaboration meeting 1406 Oct. 2009
T-(t1+t2+t3+t4)/4
T-(t1+t2+t3+t4)/4
T-(
t1+
t2+
t3+
t4)/
4ADC
<T-(
t1+
t2+
t3+
t4)/
4>
ADC
MRPC CalibrationIntrinsic timing resolution = 67 ps (including momentum spread)
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14th CBM collaboration meeting 1506 Oct. 2009
Efficiency and resolution plateau
65 ps
97%
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14th CBM collaboration meeting 1606 Oct. 2009
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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14th CBM collaboration meeting 1706 Oct. 2009
Cross Talk
Trigger on the strip center:
“Cross talk” at neighbor strips: 3%
Trigger Area: 2 cm wide
“Cross talk” at next-to-neighbor strips: ~2%
Require valid TDC on two ends
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14th CBM collaboration meeting 1806 Oct. 2009
TDC vs. QDCValid TDCs and valid QDCs (3 sigma above pedestal)
Valid TDCs
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14th CBM collaboration meeting 1906 Oct. 2009
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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14th CBM collaboration meeting 2006 Oct. 2009
MRPC #2
Valid TDCs and QDCs
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14th CBM collaboration meeting 2106 Oct. 2009
Efficiency vs. Position
Valid TDCs
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14th CBM collaboration meeting 2206 Oct. 2009
Valid TDCs and valid QDCs (3 sigma above pedestal)
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14th CBM collaboration meeting 2306 Oct. 2009
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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14th CBM collaboration meeting 2406 Oct. 2009
MRPC #3
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14th CBM collaboration meeting 2506 Oct. 2009
Efficiency vs. Position
Valid TDCs
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14th CBM collaboration meeting 2606 Oct. 2009
Summary
Three prototypes were successfully tested. Efficiency: > 97% Time resolution: 60-70 ps Cross talk: < 3%
With position from silicon detectors, the data will be further analyzed.
Thank
you!
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14th CBM collaboration meeting 2706 Oct. 2009
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14th CBM collaboration meeting 2806 Oct. 2009
Longitudinal
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14th CBM collaboration meeting 2906 Oct. 2009
Double hit