Barrel TRT Module Cooling

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Barrel TRT Module Cooling

• Chiho Wang
• Duke University

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• Motivation
• Gas gain is a function of temperature
• Uniform temperature needed inside module for
  optimum TR function
• Requirements
• Type 1 module heating is 7.5 Watts
• Want T gradient ? 10 ºC
• Heat Transfer Path
• Heat generated in straws by ionization charge
  multiplication.
• transfer to shell via radiator material inside
  the module.
• Shell has good thermal conductivity (50-100
  W/m-K) transfers heat to cooling tubes at two
  opposite corners

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• Calculation by BNL
• ?T 8.6 ºC

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• Duke experimental studies
• Put 1.3m prototype module in thermally insulated
  box
• Heat module with electric current through straws
• Flow cooling water in cooling tube at 24 ºC
• Measure T with small thermistors inside module
  and attached to outside of shell

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• Module cooling test chamber

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• Results of experiments
• ?T 10 ºC

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Barrel TRT Module Cooling

• Conclusion
• Current cooling scheme meets requirement.