Closed Cycle Cryocooler for Low Temperature Electronic Circuits. Phase I. Concept Study
Abstract
The ultimate goal of the total program is to develop cryocoolers which operate at 4.2K with a heat load of at least 10 milliwatts. The goal of this Phase I effort is to conduct a conceptual study of small, low power, very low magnetic signature, lightweight, efficient closed cycle cryocoolers suitable for use with superconductive and other low temperature electronic circuits and systems. For this initial phase, the cryocoolers are to produce 50 milliwatts at 10K or less with electrical input power not to exceed 250 watts. This study has examined various thermodynamic approaches and modeling. Regenerator geometries have been examined and regenerator materials have been screened, selected, and evaluated. Several configurations have been evaluated. Preliminary vibration and magnetic signature analyses have been performed on the most promising concepts. Three primary concepts were selected. These are small Macor concept, a large Macor concept and a Nylon concept. All have input power requirements between 140 and 210 watts. The small Macor concept is recommended for Phase II design and development because of its small size, ceramic construction and higher operating speed. An integral drive is recommended. Conclusions are reached that the power goal is achievable as is the temperature fluctuation goal, but the vibration and magnetic signature goals require further definition and analysis. Other critical areas identified include helium permeation and ceramic residual iron.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1980
- Accession Number
- ADA093416