Drift velocity [cm/µsec]
Drift velocity vs E/p
32
Gas: CO2 20%, Ar 80%, T=300 K, p=1 atm
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
-1
10
2
1
10
10
E/p [V/cm.Torr]
-9
Gas: CO2 20%, Ar 80%, T=300 K, p=1 atm
Ion mobility [cm /V.µsec]
*10
Ion mobility vs E/p
1400
2
1350
1300
1250
1200
1150
1100
1050
1000
950
900
850
-1
10
2
1
10
10
E/p [V/cm.Torr]
Diffusion coefficients vs E/p
Diffusion*Sqrt(p) [sqrt(Torr.cm)]
Gas: CO2 20%, Ar 80%, T=300 K, p=1 atm
0.85
0.8
0.75
0.7
0.65
0.6
0.55
0.5
0.45
0.4
0.35
0.3
0.25
-1
10
2
1
10
10
E/p [V/cm.Torr]
Townsend and attachment coeff. vs E/p
Townsend and attachment coeff./p [1/cm.Torr]
Gas: CO2 20%, Ar 80%, T=300 K, p=1 atm
1
10
10
10
10
10
10
10
10
10
-1
-2
-3
-4
-5
-6
-7
-8
-9
-1
10
2
1
10
10
E/p [V/cm.Torr]
Electron drift lines from a track
y-Axis [cm]
Cell: TEC
Gas: CO2 20%, Ar 80%, T=300 K, p=1 atm
Particle: π-, Ekin=2 GeV
Isochrone interval: 0.05 [µsec]
3.4
3.2
3
2.8
2.6
2.4
2.2
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
6.2
6
5.8
5.6
5.4
5.2
5
4.8
4.6
4.4
4.2
4
3.8
3.6
x-Axis [cm]
Drift time
Drift time [µsec]
Cell: TEC
Gas: CO2 20%, Ar 80%, T=300 K, p=1 atm
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
Wire 9
Wire 10
Wire 11
4
3.8
3.6
3.4
3.2
3
2.8
2.6
2.4
2.2
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
-0.2
Distance from track start [cm]
Electron drift lines from a wire
y-Axis [cm]
Cell: TEC
Gas: CO2 20%, Ar 80%, T=300 K, p=1 atm
Isochrone interval: 0.05 [µsec]
3.4
3.2
3
2.8
2.6
2.4
2.2
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
6.2
6
5.8
5.6
5.4
5.2
5
4.8
4.6
4.4
4.2
4
3.8
3.6
x-Axis [cm]