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Prototype Performance in D0 test stand & fiber intrinsic performance with KEK test beam

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.

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Prototype Performance in D0 test stand & fiber intrinsic performance with KEK test beam

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  1. Prototype Performance in D0 test stand&fiber intrinsic performance with KEK test beam M.Yoshida (Osaka Univ.) 2004/8/2 @ Osaka

  2. 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 W view V view X view

  3. Waveguide Connection 126 channel / waveguide bundle of 7×18 clear fibers bundle of 18 clear fibers (4meter long, 1.05mmF)

  4. DAQ at D0 test stand • VLPC • QE~80% for 3HF spectrum • AFE (516 channels) • 8 MCM (64 channels in each) • SVX (Sample&Hold / Degitize) • SASeq (Stand-Alone Sequencer) • VB Program on MS-Excell 500nm 700nm 3HF spectrum

  5. 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

  6. X view C × × B A Sinple tracking in X view(H. Sakamoto) • Hit definition • Threshold is set at 0.5 p.e. • Tracking • 1D tracking in X view • Minimize residual Δ Δ

  7. Light yield as a function of 3HF concentration • 3HF concentration in B station • X view (B) 5000ppm • W view (B) 3500ppm • V view (B) 2500ppm • ADC spectrum for each view

  8. 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)

  9. Results of 3D tracking analysis • Resolution: 442 ± 4 (stat) ± 27 (syst) m • Expectation from fibre geometry: 424 – 465 m(single fiber bunch or two fiber bunch) • Most probable light yield: 10.5 – 11 p.e. (3HF2500ppm) • Expectation based on D0 experience ~10 p.e. • Efficiency: (99.7 ± 0.2)% • Poisson expectation for 10 p.e. signal 99.7% • Dead channels 0.2% (two channels) • 0.25% assumed in G4MICE simulation based on D0 experience

  10. Purpose of KEK beam test • 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, 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)

  11. Attaching SciFi with MICE conn. • 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

  12. Set up (KEK-T553) • Beam area : KEK-T1 beam line Dark box

  13. mirror pmt SciFi Setup (T553) • SciFi on support structure in the dark room

  14. 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

  15. ResultDouble layer && 4m clear fiber 2500ppm-1% 5000ppm-1%  Almost same light yield

  16. Summary • Prototype tracker was constructed in Oct., 2003 • 3 stations • VLPC readout • Light yield of the prototype is measured • 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 • 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 • We should estimate systematic errors in the beam-test • We will produce an additional station with both 2500ppm and 5000ppm for prototype upgrade.

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