Transcript Prototype Performance in D0 test stand M.Yoshida (Osaka Univ.) Prototype of SciFi tracker • Scifi stations • Top (station C) • X and V view •

Prototype Performance
in D0 test stand
M.Yoshida (Osaka Univ.)
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 18 clear fibers
(4meter long, 1.05mmF)
bundle of 7×18 clear fibers
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
1D tracking (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
p.e.
10.6
13.6
13.4
3D tracking (M. Ellis)
3D tracking
PTP + 2500
Mean 16.3p.e.
PTP + 5000
Mean 13.5p.e.
(We have more data, should update the figures)
Shape is reasonable?  Careful study with MC is needed.
Summary
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Prototype tracker has been constructed
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Light yield is measured
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3 stations
VLPC readout
1D & 3D tracking have been carried out.
Light yield in pT1%+3HF5000ppm is found to be less
than pT1%+2500ppm
Inconsistent result with test-beam data.
We will produce another station (made of
2500ppm and 5000ppm) to be added to the
prototype, and will test it at KEK-PS in Apr. 2005.