Prototype Performance in D0 Prototype Performance in D0 test standtest stand

&&fiber intrinsic performance fiber intrinsic performance

with KEK test beamwith KEK test beam

M.Yoshida (Osaka Univ.)M.Yoshida (Osaka Univ.)2004/8/2 @ Osaka2004/8/2 @ Osaka

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 Setup in D0 test stand at FermilabFermilab

Cryostat for VLPC cassette

AFE (Analog Front End board)

Trigger Scintillator36cm×36cm×0.5cm(t)

waveguide

Lead blocks10cm thick(100MeV for MIP)

Sinple tracking in X viewSinple tracking in X view(H. Sakamoto)(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

ADC mean (p.e.)ADC mean (p.e.)10.610.6 13.613.6 13.413.4

3D tracking3D tracking(M. Ellis)(M. Ellis)

• hit definition : 2.5 p.e. threshold• tracking in 3D

Light yield (3HF2500ppm)

Typical cosmic-ray event

Most probable~10.5 p.e.

Results of 3D tracking Results of 3D tracking analysisanalysis

Resolution: 442 Resolution: 442 ± 4 (stat) ± 27 (syst) ± 4 (stat) ± 27 (syst) mm Expectation from fibre geometry: 424 – 465 Expectation from fibre geometry: 424 – 465 mm

(single fiber bunch or two fiber bunch)(single fiber bunch or two fiber bunch) Most probable light yield: 10.5 – 11 p.e. Most probable light yield: 10.5 – 11 p.e.

(3HF2500ppm)(3HF2500ppm) Expectation based on D0 experience ~10 p.e.Expectation based on D0 experience ~10 p.e.

Efficiency: (99.7 ± 0.2)%Efficiency: (99.7 ± 0.2)% Poisson expectation for 10 p.e. signal 99.7%Poisson expectation for 10 p.e. signal 99.7%

Dead channels 0.2% (two channels)Dead channels 0.2% (two channels) 0.25% assumed in G4MICE simulation based on 0.25% assumed in G4MICE simulation based on

D0 experienceD0 experience

Purpose of KEK beam testPurpose of KEK beam test Intrinsic performance of 3HF scintillating fiber was measur

ed 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, s-type Fibers to be tested:

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.Attaching SciFi with MICE conn.

Attached the SciFi and clear fibers with MICE conn.Attached the SciFi and clear fibers with MICE conn. Clear fibers for pmt’s gain calibration Clear fibers for pmt’s gain calibration

Clear fiber (1.05mmΦ)

SciFi (0.35mmΦ): 14fibers

SciFi

Clear fib

Set up (KEK-T553)Set up (KEK-T553) Beam area : KEK-T1 beam line

Dark box

Setup (T553)Setup (T553)

mirrorpmt

SciFi

•SciFi on support structure in the dark room

Light yield with various 3HF Light yield with various 3HF concentrationconcentration

1. 5000 -1%2. 4500 -1%3. 10000 -1%4. 2500 -1%5. 5000 -2%6. 3500 -1%7. 7500 -1%8. 10000 -2%

1.2GeV/c 1.2GeV/c proton

0.6GeV/c proton

(5000ppm with 20% higher PMT gain )

ResultResultDouble layer && 4m clear fiber

5000ppm-1% 2500ppm-1%

Almost same light yield

SummarySummary Prototype tracker was constructed in Oct., 2003Prototype tracker was constructed in Oct., 2003

3 stations3 stations VLPC readoutVLPC readout

Light yield of the prototype is measuredLight yield of the prototype 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 less than Light yield in pT1%+3HF5000ppm is found to be less than

pT1%+2500ppmpT1%+2500ppm Beam test was carried out in Apr.-May 2003Beam test was carried out in Apr.-May 2003

Check intrinsic performance of 3HF fiberCheck intrinsic performance of 3HF fiber PTP1%+3HF5000ppm has the best light yield in the data set PTP1%+3HF5000ppm has the best light yield in the data set

w/o waveguide.w/o waveguide. 3HF5000ppm was found to have almost same light yield (4-3HF5000ppm was found to have almost same light yield (4-

5p.e.) as 3HF2500ppm after transmitting in 4m-long 5p.e.) as 3HF2500ppm after transmitting in 4m-long waveguidewaveguide

Discrepancy between the prototype and beam-testDiscrepancy between the prototype and beam-test We should estimate systematic errors in the beam-testWe should estimate systematic errors in the beam-test We will produce an additional station with both 2500ppm and We will produce an additional station with both 2500ppm and

5000ppm for prototype upgrade.5000ppm for prototype upgrade.