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Published byKelley Poole Modified over 9 years ago
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Result of MWPC-TPC beam test ILC Detector Workshop 3-5 March 2005, KEK Osamu Nitoh, TUAT
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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
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MPI-TPC prototype with MWPC replaceable with GEM, Micromegas,
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MPI-TPC prototype
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Pad plane Pad plane 100mm x 100mm Pad size 2mm x 6mm 12 of 16 rows (384 pads) Wire spacing 2mm (without field wires) Pad-wire distance 1mm (σ_PRF ~ 1.4mm, in principle) Y X
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e B E Pad plane(10×10cm) 36cm 27cm ~ 200V/cm TPC Cage Gas Ar:CH 4 :CO 2 93:5:2 Maximum drift length 27cm Cross section of TPC
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JACEE magnet (for BESS-II) Without Return Yoke B =1~1.2T @ center
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C1 C2 Aeroge l TC1TC2 TOF1 TOF2 TPC 7m π 2 beam line
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π2 beam line Beam TPC in JACEE magnet
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TPC Setup into Magnet
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Typical Event π - B = 1T p = 4GeV/c φ = -20deg
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Pad Response Function X track -X padi (mm) Q i /Q total Wire Pad X padi X track 1 0 Drift track
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B=0T 0-10 210-220 160-170 110-120 60-7050-60 100-110 150-160 200-210230-240 70-80 220-230 120-130 170-180180-190 90-100 240-250 190-200 140-150 80-90 130-140 10-2020-3030-4040-50 Drift distance : z=0-10,10-20,20-30,....,230-240,240-250mm B=1T
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Drift distance: z=0-10,10-20,20-30,....,230-240,240-250mm 0-10 210-220 160-170 110-120 60-7050-60 100-110 150-160 200-210230-240 70-80 220-230 120-130 170-180180-190 90-100 240-250 190-200 140-150 80-90 130-140 10-2020-3030-4040-50
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Drift distance dependence {σ x (z=0)} 2 2.06±0.01 D C 2 0.005±0.00009 {σ x (z=0)} 2 2.07±0.02 D C 2 0.025±0.0002 B=0T B=1T σx2σx2
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Diffusion Constant σ x (z= 0)=1.4(mm) B=0T: C D =0.5mm/√(cm), B=1T: C D =0.22mm/√(cm)
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Φdependence ( B=1T,z=0 ) σ 2 PRF =σ 2 PRF (min)+b 2 ( tanφ-tan(ψ eff )) 2 σ PRF (min) 1.432±0.004 b 2.3±0.08 tan(ψ eff ) 0.02852±0.008 2.85 2.05
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z as a function of drift distance preliminary
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Charge Distribution( 1 Hit) Q i 1GeV π 2GeV π 4GeV π 1GeV P 2GeV P 4GeV P
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1GeV P 2GeV P 4GeV P 1GeV π 2GeV π 4GeV π Charge Distribution( 1 Track) Average over 1 tack (Sample length 6mm×7pad-rows) ΣQ i 7 I=1 7 Q 7 =
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dE/dX resolution (MPI-TPC ) > 5/7 Trancated Mean P 4GeV > βγ Dependence ΣQ i 7 I=1 7 Q 7 = ΣQ i 5 I=1 5 Q 5/7 = ( Q i = smallest 5 in 7) Search the dependence by using the Q 5/7
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dE/dX Resolution Mean =216.8 σ = 46.9 σ = 46.9 Mean =194.1 σ = 51.7 σ = 51.7 π P σ ÷<Mean> = 21.6±0.8% = 21.6±0.8% σ dE/dx = 4GeV 4GeV σ dE/dX = 26.6±1.5%
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* Extrapolation to the LC TPC * 70%Trancated Mean π 4GeV Assume LC TPC with Rout - Rin (= 160cm) * 175sample 250samples = (Rout - Rin) / l pad =(1600mm / 6.3mm) Q i (I=1,,,, 250) Q i (I=1,,,,175) Smallest 70% ΣQ i 175 I=1 175 Q 175 =
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dE/dX Resolution 4 GeV Proton = 180.9 = 180.9 rms = 7.7 rms = 7.7 4 GeV Pion = 203.8 = 203.8 rms = 7.3 σ dE/dX = 3.6±0.7% π P 4GeV σ dE/dX = 4.2±0.8% ΣQ i 175 i=1 175 Q 175 = ( Q i =smallest 175 in 250)
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