DTIC ADA627321: RF Breakdown Prevention, Part 2 pdf

DTIC ADA627321: RF Breakdown Prevention, Part 2

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Refrigeration tests were performed on the Sunpower CryoTel CT cryocooler to provide design inputs prior to a contractor s payload critical design review. The primary performance matrix was obtained at cold tip temperatures of 60 K, 65 K, and 70 K at heat loads of 3.75 W and 4.5 W. Forced convective air cooling was used to maintain the cryocooler heat rejection temperature at 45 Degrees C. The cooler required 129.5 W of electrical input power to the thermo-mechanical unit (TMU) to remove 4.5 W from the cold tip at 65 K and 112 W of input power to remove 3.75 W at 65 K. By lowering the heat rejection temperature to 30 Degrees C, the required TMU power consumption to remove 4.5 W and 65 K was reduced to 120.3 W. Independent voltage and current measurements were taken to verify the inputs to the vendor s controller and showed good agreement with the commanded power levels

• Creator/s: Defense Technical Information Center
• Date: 5/7/2015
• Year: 2015
• Book Topics/Themes: DTIC Archive, , AEROSPACE CORP EL SEGUNDO CA, *BREAKDOWN(ELECTRONIC THRESHOLD), *CRYOCOOLERS, *RADIOFREQUENCY, AIR COOLED, ARTIFICIAL SATELLITES, BANDWIDTH, CONVECTION(HEAT TRANSFER), ENERGY CONSUMPTION, IONIZATION, LOW TEMPERATURE, MEASUREMENT, PERFORMANCE(ENGINEERING), POWER LEVELS, REFRIGERATION SYSTEMS, TEST AND EVALUATION, THERMOMECHANICS, VOLTAGE

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