Result of MWPC-TPC beam test ILC Detector Worksh op 3-5 March 2005, KEK Osamu Nitoh, TUAT
Jan 15, 2016
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 MWPC replaceable with GEM, Micromegas,
MPI-TPC prototype
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
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
JACEE magnet (for BESS-II)
Without Return Yoke
B =1~1.2T @ center
C1 C2 Aerogel
TC1 TC2TOF1 TOF2
TPC
7m
π 2 beam line
π2 beam line
Beam
TPC in JACEE magnet
TPC Setup into Magnet
Typical Event
π-B = 1Tp = 4GeV/cφ = -20deg
Pad Response Function
Xtrack-Xpadi (mm)
Qi/Qtotal
Wire
Pad
Xpadi
Xtrack
1
0
Drifttrack
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
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
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
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)
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
z as a function of drift distance
preliminary
Charge Distribution( 1 Hit) Qi
1GeVπ
2GeVπ
4GeVπ
1GeVP
2GeVP
4GeVP
1GeVP
2GeVP
4GeVP
1GeVπ
2GeVπ
4GeVπ
Charge Distribution( 1 Track)Average over 1 tack (Sample length 6mm×7pad-rows)
ΣQi
7
I=1
7Q7 =
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
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%%
*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 =
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)