Transcript Summary of final results from MICE note: “MICE Scintillating Fibre Tracker Prototype - First progress report -” M.Yoshida (Osaka Univ.) for the SciFi working group.

Summary of final results
from MICE note:
“MICE Scintillating Fibre Tracker
Prototype
- First progress report -”
M.Yoshida (Osaka Univ.)
for the SciFi working group
contents of the note
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Describe the techniques to build SciFi
tracker
Demonstrate the performance with
prototype
Simulate the full tracker based on the
prototype results
Report of safety issue, cost and schedule
MICE SciFi tracker
Station production
Carbon-fiber station body
Fiber sheet (1500 3HF fiber)
The first prototype of SciFi tracker
• Scifi stations
• Top (station C)
• X and V view
• Middle (station B)
• X,V,W view
• Bottom (station A)
• X and W view
~80 cm
X view
Waveguide Connection
bundle of 18 clear fibers
(4meter long, 1.05mmF)
bundle of 7×18 clear fibers
126 channel in each conduit
Readout system for prototype
(D0 test stand)
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VLPC
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QE~80% for 3HF
spectrum
Gain ~ 50,000
Operating temp. ~9K
AFE (516 channels)
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8 MCM (64 channels in
each)
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500nm 700nm
SVX (Sample&Hold /
Degitize)
SASeq (Stand-Alone
Sequencer)
VB Program on MSExcell
3HF spectrum
Effect of radio-frequency noise on
the electronics
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RF OFF
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RF ON
200MHz
Determine the response
of the readout electronics
to RF power leaking from
the cavities and the power
supplies
In the worst case, the
pedestal width increased
by 0.5 ADC counts or
approximately a count of
0.033 photo-electrons
Tracking
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Pedestal/Common mode subtraction
Fiber hit threshold >1p.e.
Cluster > 2 p.e.
Search triplet hits in Station B
Search duplet hits in Station A and C
Pattern recognition
A
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B
C
Straight track
Typical cosmic-ray event
Prototype performance (Light yield)
3HF concentration in station B
•X view 5000ppm
•W view 3500ppm
•V view 2500ppm
3HF
concentration
(ppm)
Most probable
light yield
(p.e.)
2500
10.49 ± 0.15
3500
10.32 ± 0.12
5000
8.89 ± 0.06
Prototype performance (II)
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Efficiency
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Measured e > 99%
Measured Efficiency
(%)
Expected Efficiency
(%)
2500
99.73 ± 0.16 (stat.)
99.72 (10PE)
3500
99.29 ± 0.25 (stat.)
99.72 (10PE)
5000
98.09 ± 0.39 (stat.)
98.62 - 99.38 (8-9PE)
Position resolution
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442 ± 4 (stat) ± 27 (syst) mm
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3HF Concentration
(ppm)
Expected : 424 – 465 mm
Dead channel
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Definition; fewer hits above 4 p.e.
2 channels / 1008 = 0.2%
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D0 fiber tracker case : 0.25%
Performance of the full tracker
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The performance of the tracker has been
studied using the G4MICE package
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Input : G4BeamLine with RF background
Simulation based on the results of the
prototype
Results  Malcolm’s talk
sx = 376 mm
spt =1.28 MeV/c
Safety and integration
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No active components in the tracking
volume
No cryogen or oxygen for VLPC system
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The cryogenic system will be based on a
closed-cycle refrigerator, a cryocooler
Cryocooler system will be tested in 2005 KEK
beam-test
A prototype patch panel will be
fabricated and tested for vacuum
integrity and stability under pressure
Cost
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The MICE scintillating-fibre tracker cost
was estimated
Loan of VLPC system from FNAL-D0 will
reduce the cost ~ 1M$
Schedule
2004
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2005
2006
2007
4th station is now building to confirm techniques to build
final tracker module
4-station prototype is planned to be exposed to KEK-PS
test beam with SC solenoid in the summer of 2005
Summary
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Prototype tracker has been successfully constructed
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Tracking on the prototype works well
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3 stations + VLPC readout
No effect of RF noise was measured on VLPC system
Most probable Light yield = 10.49 ± 0.15 (p.e.) (3HF2500ppm)
High Efficiency : more than 99%
Few dead channel : 2 / 1008 channels
Performance of the full tracker is estimated using
simulation based on results of the prototype