Development of the TRD gas monitor

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Development of the TRDgas monitor

• Dariusz Antonczyk
• IKF Frankfurt am Main

• Outline
• Motivation Principle
• Current status
• Software development
• Outlook

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Motivation

• We want to monitor gas quality with high
  precision
• Nitrogen in the TRD will accumulate over the time
• ? three component gas mixture (Xe-CO2-N2)
• GOOFIE as a drift velocity monitor (NA49 TPC,
  CERES TPC, HADES MDC, STAR FTPC), for Alice TPC
  extended to monitor gas composition
• Requirements
• Drift field 700 V/cm !!!
• Measurement of the drift velocity and gain
• Drift velocity resolution better then 10

Dominik Wegerle
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Principle

• Uniform drift field
• Two Am24195 sources
• Two trigger counters
• Pickup detector

• (d2-d1)/(t2-t1) ? drift velocity

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Monitoring of gas composition (Xe-CO2-N2)

• Drift velocity dependence (based on Magboltz
  simulation)
• Gain dependence in preparation

_at_ 400 V/cm
_at_ 700 V/cm
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Current status

• Basic experimental setup ready
• gas supply (mixing station in preparation)
• power supplies
• readout electronic
• software
• data has been taken with such setup
• TRD GOOFIE waiting for
• Simulations
• Hardware modifications

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GOOFIE Read-out board
Thanks to L.Musa and A. Junique
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Software development (common effort with the TPC
GOOFIE team)

• ON-Line monitoring
• Communication with hardware (GOOFIE NI cards)
• Hardware Software communication mechanism
• Extracting drift velocity, gas composition, gas
  gain
• Communication with PVSS II through DIM server

DIM server
Communication with GOOFIE NI card
Analysis part
DCS PVSS II
Data exchange mechanism
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Outlook

• Modification of GOOFIE TRD will start soon
• ON-Line software foreseen to be ready at the end
  of May
• Looking forward for modified read-out board for
  GOOFIE