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
VLPC Gain (LED)
Typical spectrum of LED in a VLPC channel
1p.e.
pedestal
2p.e.
Typical Gain:
15 ADC counts/ p.e.
Preamp Gain Setting: 0x350
Gain Setting: 0x150
6 ADC counts/ p.e.
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
Light yield in Station A,C
X view
V view
Station A
X view
> 10 counts
to select cosmic-ray
W view
Station C
Light yield in Station B
X view: PTP+3HF 5000ppm
W view: PTP+3HF 3500ppm
V view: PTP+3HF 2500ppm
W view
V view
X view
Peak at 24 counts
 4 p.e.
Expectation from beam test
in KEK
• 2.6 p.e. in 0.35mm scifi
• QE of VLPC ~ 4 times
larger than PMT
• Transport loss in
waveguide ~ 40%
• assume connection loss ~
10% at each optical
connector
 5p.e.
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
Rough selection for cosmic-ray
4 p.e. is measured in 0.35mmF SciFi with PTP+5000ppm
We succeeded to see photons from SciFi tracker!
Precise analysis (cosmic-ray selection, tracking) will be
done.
Typical cosmic-ray event
By M.Ellis