Prototype PerformancePrototype Performance in D0 test stand in D0 test stand

M.Yoshida (Osaka Univ.)M.Yoshida (Osaka Univ.)

Prototype of SciFi trackerPrototype 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 viewX view

W v

iew

W v

iew V

vie

wV v

iew

Waveguide ConnectionWaveguide Connection

bundle of 18 clear fibers (4meter long, 1.05mm) bundle of 7×18 clear fibers

126 channel / waveguide

DAQ at D0 test standDAQ at D0 test stand

VLPCVLPC QE~80% for 3HF spectr

um AFE (516 channels)AFE (516 channels)

8 MCM (64 channels in 8 MCM (64 channels in each)each)

SVX (Sample&Hold / SVX (Sample&Hold / Degitize)Degitize)

SASeq (Stand-Alone SSASeq (Stand-Alone Sequencer)equencer)

VB Program on MS-ExcVB Program on MS-Excellell

3HF spectrum

500nm 700nm

Setup in D0 test stand at FermilabSetup in D0 test stand at Fermilab

Cryostat for VLPC cassette

AFE (Analog Front End board)

Trigger Scintillator36cm×36cm×0.5cm(t)

waveguide

Lead blocks10cm thick(100MeV for MIP)

1D tracking (H. Sakamoto)1D tracking (H. Sakamoto)

Hit definition Threshold is set at 0.5 p.e.

Tracking 1D tracking in X view Minimize residual Δ

A

B

CX view

× ×

Δ

Light yield as a function of Light yield as a function of 3HF concentration3HF concentration

3HF concentration in B station X view (B) 5000ppm W view (B) 3500ppm V view (B) 2500ppm

ADC spectrum for each view

3HF3HF 5000ppm5000ppm 3500ppm3500ppm 2500ppm2500ppm

p.e.p.e. 10.610.6 13.613.6 13.413.4

3D tracking (M. Ellis)3D tracking (M. Ellis)

3D tracking3D tracking

PTP + 5000Mean 13.5p.e.

PTP + 2500Mean 16.3p.e.

Shape is reasonable? Careful study with MC is needed.

(We have more data, should update the figures)

SummarySummary

Prototype tracker has been constructedPrototype tracker has been constructed 3 stations3 stations VLPC readoutVLPC readout

Light yield is measuredLight yield is measured 1D & 3D tracking have been carried out. 1D & 3D tracking have been carried out. Light yield in pT1%+3HF5000ppm is found to be Light yield in pT1%+3HF5000ppm is found to be

less than pT1%+2500ppmless than pT1%+2500ppm Inconsistent result with test-beam data.Inconsistent result with test-beam data.

We will produce another station (made of We will produce another station (made of 2500ppm and 5000ppm) to be added to the 2500ppm and 5000ppm) to be added to the prototype, and will test it at KEK-PS in Apr. prototype, and will test it at KEK-PS in Apr. 2005.2005.