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Result of MWPC-TPC beam test

Result of MWPC-TPC beam test. ILC Detector Workshop 3-5 March 2005, KEK Osamu Nitoh, TUAT. collaboration. Europe DESY MPI IPN Olsay Asia KEK Kinki University Kogakuin University Saga University

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Result of MWPC-TPC beam test

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  1. Result of MWPC-TPC beam test ILC Detector Workshop 3-5 March 2005, KEK Osamu Nitoh, TUAT

  2. collaboration • Europe • DESY • MPI • IPN Olsay • Asia • KEK • Kinki University • Kogakuin University • Saga University • Tokyo University of Agriculture and Technology • University of Tokyo • University of Tsukuba • Mindanao State University

  3. MPI-TPC prototype with MWPCreplaceable with GEM, Micromegas,

  4. MPI-TPC prototype

  5. Pad plane Ｘ Ｙ Pad plane 100mm x 100mm Pad size 2mm x 6mm 12 of 16 rows (384 pads) Wire spacing 2mm (without fieldwires) Pad-wire distance 1mm (σ_PRF ~ 1.4mm, in principle)

  6. e B 36cm 27cm GasAr:CH4:CO2 93:5:2 Maximum drift length 27cm ～200V/cm TPC Cage Pad plane(10×10cm) E Cross section of TPC

  7. JACEEmagnet (for BESS-II) • Without Return Yoke • B =1~1.2T @ center

  8. TC1 TC2 C2 TOF2 TOF1 C1 Aerogel 7m TPC π２ beam line

  9. π2 beam line TPC in JACEE magnet Beam

  10. TPC Setup into Magnet

  11. Typical Event π- B = 1T p = 4GeV/c φ = -20deg

  12. Pad Response Function track Drift Qi/Qtotal 1 Wire Pad 0 Xtrack-Xpadi(mm) Xtrack Xpadi

  13. B=0T Drift distance: z=0-10,10-20,20-30, .... ,230-240,240-250mm 0-10 10-20 20-30 30-40 40-50 50-60 60-70 90-100 70-80 80-90 B=1T 100-110 110-120 120-130 130-140 140-150 150-160 160-170 170-180 180-190 190-200 200-210 210-220 220-230 230-240 240-250

  14. B=1T Drift distance: z=0-10,10-20,20-30, .... ,230-240,240-250mm 0-10 10-20 20-30 30-40 40-50 50-60 60-70 90-100 70-80 80-90 100-110 110-120 120-130 130-140 140-150 150-160 160-170 170-180 180-190 190-200 200-210 210-220 220-230 230-240 240-250

  15. Drift distance dependence σx２ B=0T {σx(z=0)}2 2.07±0.02 DC20.025±0.0002 B=1T {σx(z=0)}2 2.06±0.01 DC 20.005±0.00009

  16. Diffusion Constant • σx(z=0)=1.4(mm) • B=0T: CD=0.5mm/√(cm), • B=1T: CD=0.22mm/√(cm)

  17. Φdependence（B=1T,z=0) σPRF(min) 1.432±0.004 b 2.3±0.08 tan(ψeff) 0.02852±0.008 2.85 • σ2PRF=σ2PRF(min)+b2（tanφ-tan(ψeff))2 2.05

  18. sz as a function of drift distance preliminary

  19. Charge Distribution( 1 Hit) Qi 2GeV P 4GeV P 1GeV P 4GeV π 2GeV π 1GeV π

  20. Charge Distribution(１Track) ７ ΣQi Average over 1 tack (Sample length 6mm×7pad-rows) Q7 = I=1 7 4GeV P 1GeV P 2GeV P 4GeV π 2GeV π 1GeV π

  21. dE/dX resolution (MPI-TPC) ＞5/7 Trancated Mean 5 7 ΣQi ΣQi ( Qi = smallest 5 in 7) I=1 Q7 = Q5/7 = I=1 5 7 P 4GeV ＞βγ Dependence Search the dependence by using the Q5/7

  22. dE/dX Resolution Mean =216.8 σ = 46.9 π 4GeV σdE/dx σ = ÷<Mean> = 21.6±0.8% Mean =194.1 σ = 51.7 4GeV P σdE/dX = 26.6±1.5%

  23. *Extrapolation to the LC TPC Assume LC TPC with Rout - Rin (= 160cm) π 4GeV 250samples = (Rout - Rin) / lpad =(1600mm / 6.3mm) Qi(I=1, , , , 250) Qi(I=1,,,,175) Smallest 70% ＊70%Trancated Mean ＊175sample 175 ΣQi Q175 = I=1 175

  24. dE/dX Resolution 175 ΣQi i=1 Q175 = ( Qi =smallest 175 in 250) ４GeV Proton <dE/dx>=180.9 rms= 7.7 ４GeV Pion <dE/dX>= 203.8 rms= 7.3 175 4GeV P =4.2±0.8% σdE/dX 4GeV π σ = 3.6±0.7% dE/dX

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