Citation
Abstract
A 2.5-K cooler suitable for cooling cavity maser amplifiers is described. The device combines a 4-K Gifford-McMahon (GM) refrigerator with a Joule-Thomson (JT) circuit to provide 180 mW of cooling at 2.5 K. The device is compact and can operate in any physical orientation. A commercial two-stage GM cooler pre-cools the helium JT circuit flow. The JT circuit can be simplified as compared with existing systems. Only two counter flow heat exchangers are necessary. The 4-K GM operating temperature also allows the use of a single-stage compressor for the JT circuit. The JT circuit operates with a supply pressure of only 110 kPa. A commercial scroll vacuum pump is used as a compressor. The simplified system can be fabricated for less than the cost of current 4.5-K maser coolers.
Details
- Volume
- 42-147
- Published
- November 15, 2001
- Pages
- 1–9
- File Size
- 717.1 KB