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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 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 • Tokyo University of Agriculture and Technology • University of Tokyo • University of Tsukuba • Mindanao State University
MPI-TPC prototype with MWPCreplaceable with GEM, Micromegas,
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)
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
JACEEmagnet (for BESS-II) • Without Return Yoke • B =1~1.2T @ center
TC1 TC2 C2 TOF2 TOF1 C1 Aerogel 7m TPC π2 beam line
π2 beam line TPC in JACEE magnet Beam
Typical Event π- B = 1T p = 4GeV/c φ = -20deg
Pad Response Function track Drift Qi/Qtotal 1 Wire Pad 0 Xtrack-Xpadi(mm) Xtrack Xpadi
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
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
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
Diffusion Constant • σx(z=0)=1.4(mm) • B=0T: CD=0.5mm/√(cm), • B=1T: CD=0.22mm/√(cm)
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
sz as a function of drift distance preliminary
Charge Distribution( 1 Hit) Qi 2GeV P 4GeV P 1GeV P 4GeV π 2GeV π 1GeV π
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
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
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%
*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
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