Accession Number : ADA134043

Title :   Closed Cycle Cryocooler for Low Temperature Electronics Circuits: Cold End Test.

Descriptive Note : Final rept. 9 Apr-31 Dec 82,


Personal Author(s) : Pirtle,F William

PDF Url : ADA134043

Report Date : Aug 1983

Pagination or Media Count : 27

Abstract : A fabricated MACOR cold end including a metallic coating to prevent helium permeation and a fabricated die post displacer support bearing were combined with a compressor and motor which are standard CTI-CRYOGENICS products. A mechanical test was performed on the test cryocooler to determine that the mechanical test was performed on the test cryocooler to determine that the MACOR displacer was successfully guided by the die post bearing. Thermodynamic tests were conducted to determine the lowest temperature of the 4th (coldest) stage as a function of operating speed, helium charge pressure, 4th stage electrical heat load, and transfer tube diameter. Cooldown and steady state results are reported. Results indicate a low temperature limit of approximately 95K with the current test hardware. Although this represents an improvement from 122K during the program, a resizing will be necessary to reach 10K. The die post displacer support bearing and the MACOR cold finger construction are mechanically satisfactory.

Descriptors :   *Refrigeration systems, Electronic equipment, Cooling, Closed cycle systems, Cryogenics, Stirling cycle, Performance(Engineering), Laboratory tests, Thermodynamic properties

Subject Categories : Electrical and Electronic Equipment
      Air Condition, Heating, Lighting & Ventilating

Distribution Statement : APPROVED FOR PUBLIC RELEASE