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TRT Barrel Cooling: Electronics

TRT Barrel Cooling: Electronics. Motivation: Overheating of electronics causes premature failure Requirements: 60 mW per channel Total for type 1(inner) module ~ 20 W Want operating T < 50 ºC Cooling Plan: Heat generated by IC through stamp board/banding through legs/sockets

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TRT Barrel Cooling: Electronics

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  1. TRT Barrel Cooling: Electronics • Motivation: • Overheating of electronics causes premature failure • Requirements: • 60 mW per channel • Total for type 1(inner) module ~ 20 W • Want operating T < 50 ºC • Cooling Plan: • Heat generated by IC • through stamp board/banding • through legs/sockets • into cooling plate • to mounting channel/tubing • to cooling fluid

  2. Current Duke Prototype: • Aluminum cooling plate/tubing • tension plate • insulated box • additional sensors/readout

  3. From Lund: • ASDBLR & DTMROC dummy boards (pictured here) • Roof boards • Readout and display software

  4. Results of tests: (coolant at 14 ºC) • 1.3 mm cooling plate + all sockets: • ASDBLR: 46 ºC • DTMROC: 48 ºC • roof boards: 38 ºC • cooling, tension plates: ~ 27 ºC • (Typical range: ± 2 ºC)

  5. Remaining issues/improvements: • Mass production of tubing • Attachment of tubing/channel • Heat transfer banding/legs/sockets • Replacement of aluminum cooling plate by pyrolytic graphite (PG): • Motivation: Need to reduce material to get acceptable radiation length

  6. Properties of PG material: • Made by pyrolysis of hydrocarbon gases in a vacuum furnace • Thermal conductivity(in-plane): • PG ~ 400 W/m-K • compare: Cu ~ 400, Al ~ 200 • Expensive • ~ $150k for barrel (PG) • ~ $ 50k with aluminum • Machinability / gluing? • We are exploring

  7. TRT Barrel Cooling: Module • Motivation: • Uniform temperature needed inside module for optimum TR function • Requirements: • Type 1 module heating is ~ 7.5 Watts • Want T gradient < 7 ºC • Cooling Plan: • Cooling fluid (same as electronics cooling) flows in tubing running full length of module • Tubing makes good contact inside shell at two opposite corners • Shell has good thermal conductivity (50-100 W/m-K)

  8. Calculation by BNL: • T = 8.6 ºC

  9. Duke experimental studies: • Put real module in insulated box • Heat module with current through straws • Flow cooling water at 24 ºC • Measure T with small thermistors inside module and attached to outside of shell

  10. Module cooling test chamber:

  11. Results of experiments: • T ~ 10 ºC

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