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Fast drift gases - CH 4 and CF 4

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

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Fast drift gases - CH 4 and CF 4

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  1. Fast drift gases - CH4 and CF4 40 cm drift => ~ 3-4 ms Requires high drift field 10 cm /ms 12 cm /ms CH4 C2 H4 CF4 -Ar (1 V/cm/Torr) (1 KV/cm)

  2. Fast Drift Gases - C2H2+CF4+Ar

  3. MiniTPC Simulation N. 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

  4. e/p separation with CH4 0.25-0.4 0.4 - 1.0 1.0 - 1.2 1.2 - 2.5

  5. MiniTPC Simulation N. 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

  6. 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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