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Measurement of the gas flow in a straw detector with a source and a slit

Measurement of the gas flow in a straw detector with a source and a slit. Presentation for the LHCb Outer Tracker group at NIKHEF 12 June 2003. Pedro Jiménez Delgado. Dimensions:. The Lab:. Inlet:. Outlet:. Anode currents as a function of time after change of gas:. 40 cm. 20 cm. 120 cm.

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Measurement of the gas flow in a straw detector with a source and a slit

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  1. Measurement of the gas flow in a straw detector with a source and a slit Presentation for the LHCb Outer Tracker group at NIKHEF 12 June 2003 Pedro Jiménez Delgado

  2. Dimensions: The Lab: Inlet: Outlet: 12 June 2003 - NIKHEF

  3. Anode currents as a function of time after change of gas: 40 cm 20 cm 120 cm 120 cm 12 June 2003 - NIKHEF

  4. Anode currents as a function of time after change of gas in a vertical chamber : Anode current as a function of proportion N2 in the counting gas: 95 cm 150 cm 12 June 2003 - NIKHEF

  5. Table with the measured times for 50 % of the maximal anode currents: 12 June 2003 - NIKHEF

  6. Conclusions: • Neither immediate mixing nor complete separation of gases occur. There is gas displacement with diffusion. • Even with a 2 x higher counting gas flow, it takes 2 x more time to reach50 % of the maximal anode current when changing from nitrogen to counting gas than vice versa. • 50 % of the maximal anode current corresponds to 5 % proportion of N2 in the gas mixture. • With N2 flowing upwards in the verticaldetector the anode current stayed constant until the diffusion zone like in the horizontal detector. 12 June 2003 - NIKHEF

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