Result of MWPC-TPC beam test
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Transcript of Result of MWPC-TPC beam test
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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
BE
Pad plane(10×10cm)
36cm
27cm
~ 200V/cm
TPC Cage
Gas Ar:CH4:CO2
93:5:2Maximum
drift length27cm
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 Aerogel
TC1 TC2TOF1 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 = 1Tp = 4GeV/cφ = -20deg
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Pad Response Function
Xtrack-Xpadi (mm)
Qi/Qtotal
Wire
Pad
Xpadi
Xtrack
1
0
Drifttrack
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B=0T
0-10
210-220
160-170
110-120
60-7050-60
100-110
150-160
200-210 230-240
70-80
220-230
120-130
170-180 180-190
90-100
240-250
190-200
140-150
80-90
130-140
10-20 20-30 30-40 40-50
Drift distance : z=0-10,10-20,20-30, .... ,230-240,240-250mm
B=1T
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B=1TDrift 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
200-210 230-240
70-80
220-230
120-130
170-180 180-190
90-100
240-250
190-200
140-150
80-90
130-140
10-20 20-30 30-40 40-50
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Drift distance dependence
{σx(z=0)}2 2.06±0.01
DC 2
0.005±0.00009
{σx(z=0)}2 2.07±0.02
DC2
0.025±0.0002
B=0T
B=1T
σx2
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Diffusion Constant
σx(z=0)=1.4(mm)
B=0T: CD=0.5mm/√(cm), B=1T: CD=0.22mm/√(cm)
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Φdependence ( B=1T,z=0)
σ2PRF=σ2
PRF(min)+b2 ( tanφ-tan(ψeff))2
σPRF(min) 1.432±0.004 b 2.3±0.08tan(ψeff) 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) Qi
1GeVπ
2GeVπ
4GeVπ
1GeVP
2GeVP
4GeVP
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1GeVP
2GeVP
4GeVP
1GeVπ
2GeVπ
4GeVπ
Charge Distribution( 1 Track)Average over 1 tack (Sample length 6mm×7pad-rows)
ΣQi
7
I=1
7Q7 =
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dE/dX resolution (MPI-TPC)> 5/7 Trancated Mean
P 4GeV
> βγ Dependence
ΣQi
7
I=1
7Q7 =
ΣQi
5
I=1
5Q5/7 =
( Qi = smallest 5 in 7)
Search the dependence by using the Q5/7
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dE/dX Resolution
Mean =216.8Mean =216.8 σ = 46.9σ = 46.9
Mean =194.1Mean =194.1 σ = 51.7σ = 51.7
ππ
PP
σσ ÷<Mean>÷<Mean>
= = 21.6±0.821.6±0.8%%σσdE/dxdE/dx
==
4GeV4GeV
4GeV4GeV
σσdE/dX dE/dX = = 26.6±1.526.6±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) / lpad
=(1600mm / 6.3mm)
Qi(I=1, , , , 250)
Qi(I=1,,,,175)Smallest 70%
ΣQi
175
I=1
175Q175 =
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dE/dX Resolution
44 GeV ProtonGeV Proton <dE/dx>=<dE/dx>= 180.9180.9
rmsrms = 7.7 = 7.7
44 GeV PionGeV Pion <dE/dX>= 203.8 <dE/dX>= 203.8
rmsrms = 7.3= 7.3
σσ dE/dXdE/dX = = 3.6±0.73.6±0.7% %
π
P
4GeV
4GeV
σσdE/dXdE/dX == 4.2±0.84.2±0.8%%
ΣQΣQii
175175
i=1i=1
175175QQ175175 = = ( Q( Qi i ==smallest 175 in 250)smallest 175 in 250)