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Fast drift gases - CH 4 and CF 4. 40 cm drift => ~ 3-4 m s Requires high drift field. 10 cm / m s. 12 cm / m s. CH 4. C 2 H 4. CF 4 -Ar. (1 V/cm/Torr). (1 KV/cm). Fast Drift Gases - C 2 H 2 +CF 4 +Ar. MiniTPC Simulation N. Smirnoff (STAR). Single track - PowerPoint PPT Presentation
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Fast drift gases - CH4 and CF4
10 cm /ms
12 cm /ms
40 cm drift => ~ 3-4 ms Requires high drift field
CF4 -Ar
CH4
C2 H4
(1 KV/cm) (1 V/cm/Torr)
Fast Drift Gases - C2H2+CF4+Ar
MiniTPC SimulationN. Smirnoff (STAR)
• Single track• 35 pad rows (1.5 x 0.3 cm2)• Minimum number of hits 9• Reconstructed momentum• dE/dx smeared with 25% energy resolution• Dip angle correction• Truncated mean
e/p separation with CH4
0.25-0.4 0.4 - 1.0
1.0 - 1.2 1.2 - 2.5
• Single track• 35 pad rows (1.5 x 0.3 cm2)• Minimum number of hits 9• Reconstructed momentum• dE/dx smeared with 25% energy resolution• Dip angle correction• Truncated mean
MiniTPC SimulationN. Smirnoff (STAR)
e/p separation with C2H2+Ar
0.25-0.4 0.4 - 1.0
1.0 - 1.2 1.2 - 2.5
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