1. Barrel TRT Module Cooling
Chiho Wang
Duke University

2. Motivation: Requirements: Heat Transfer Path:
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 ( W/m-K) transfers heat to cooling tubes at two opposite corners

3. Calculation by BNL:
T = 8.6 ºC

4. 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

5. Module cooling test chamber:

6. Results of experiments:
T ~ 10 ºC

7. Barrel TRT Module Cooling
Conclusion:
Current cooling scheme meets requirement.