Transcript Prototype test at D0 test stand

Prototype Performance in D0 test
stand
&
fiber intrinsic performance with
KEK test beam
M.Yoshida (Osaka Univ.)
2004/8/2 @ Osaka
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
126 channel / waveguide
bundle of 7×18 clear fibers
bundle of 18 clear fibers
(4meter long, 1.05mmF)
DAQ at D0 test stand
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VLPC
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QE~80% for 3HF
spectrum
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
Setup in D0 test stand at Fermilab
waveguide
AFE (Analog Front End board)
Lead blocks
10cm thick
(100MeV for MIP)
Trigger Scintillator
36cm×36cm×0.5cm(t)
Cryostat for VLPC cassette
Sinple tracking in X view
(H. Sakamoto)
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Hit definition
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Threshold is set at 0.5 p.e.
Tracking
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1D tracking in X view
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Minimize residual Δ
C
X view
B ×
A
Δ
×
Light yield as a function of 3HF
concentration
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3HF concentration in B station
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X view (B) 5000ppm
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W view (B) 3500ppm
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V view (B) 2500ppm
ADC spectrum for each view
3HF
5000ppm
3500ppm
2500ppm
ADC mean (p.e.)
10.6
13.6
13.4
3D tracking
(M. Ellis)
• hit definition : 2.5 p.e. threshold
• tracking in 3D
Most probable
~10.5 p.e.
Typical cosmic-ray event
Light yield (3HF2500ppm)
Results of 3D tracking analysis
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Resolution: 442 ± 4 (stat) ± 27 (syst) m
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Most probable light yield: 10.5 – 11 p.e.
(3HF2500ppm)
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Expectation based on D0 experience ~10 p.e.
Efficiency: (99.7 ± 0.2)%
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Expectation from fibre geometry: 424 – 465 m
(single fiber bunch or two fiber bunch)
Poisson expectation for 10 p.e. signal 99.7%
Dead channels 0.2% (two channels)
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0.25% assumed in G4MICE simulation based on D0
experience
Purpose of KEK beam test
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Intrinsic performance of 3HF scintillating fiber was
measured with KEK test-beam in Apr.-May, 2004.
To optimize a concentration of the 1st and 2nd
dopant in 3HF fibers
 Kuraray SCSF-3HF ; 0.35mm-phi, multi-clad, stype
 Fibers to be tested:
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pT(1%) + 3HF(5000ppm)
pT(2%) + 3HF(5000ppm)
pT(1%) + 3HF(3500ppm)
pT(1%) + 3HF(2500ppm)
pT(1%) + 3HF(4500ppm)
pT(1%) + 3HF(7500ppm)
pT(1%) + 3HF(10000ppm)
pT(2%) + 3HF(10000ppm)
Attaching SciFi with MICE conn.
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Attached the SciFi and clear fibers with MICE conn.
Clear fibers for pmt’s gain calibration
SciFi (0.35mmΦ): 14fibers
Clear fib
Clear fiber
(1.05mmΦ)
SciFi
Set up (KEK-T553)
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Beam area : KEK-T1 beam line
Dark box
Setup (T553)
•SciFi on support structure in the dark room
mirror
pmt
SciFi
Light yield with various 3HF
concentration
1. 5000 -1%
2. 4500 -1%
3. 10000 -1%
4. 2500 -1%
5. 5000 -2%
6. 3500 -1%
7. 7500 -1%
8. 10000 -2%
(5000ppm with 20% higher PMT gain )
0.6GeV/c proton
1.2GeV/c proton
1.2GeV/c p
Result
Double layer && 4m clear fiber
5000ppm-1%
2500ppm-1%
 Almost same light yield
Summary
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Prototype tracker was constructed in Oct., 2003
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Light yield of the prototype is measured
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1D & 3D tracking have been carried out.
Light yield in pT1%+3HF5000ppm is found to be less than
pT1%+2500ppm
Beam test was carried out in Apr.-May 2003
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3 stations
VLPC readout
Check intrinsic performance of 3HF fiber
PTP1%+3HF5000ppm has the best light yield in the data set w/o
waveguide.
3HF5000ppm was found to have almost same light yield (4-5p.e.) as
3HF2500ppm after transmitting in 4m-long waveguide
Discrepancy between the prototype and beam-test
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We should estimate systematic errors in the beam-test
We will produce an additional station with both 2500ppm and 5000ppm
for prototype upgrade.