| Autor: |
R. L. Plambeck |
| Rok vydání: |
1998 |
| Předmět: |
|
| Zdroj: |
Advances in Cryogenic Engineering ISBN: 9781475790498 |
| DOI: |
10.1007/978-1-4757-9047-4_229 |
| Popis: |
Eight radio telescopes in the Berkeley-Illinois-Maryland Array (BIMA) are outfitted with 4 K Gifford-McMahon refrigerators. The refrigerators cool superconducting detectors (SIS mixers) on the radio receivers; the heat load at 4 K is 10 to 20 mW. The refrigerators were constructed by welding third stages onto standard CTI model 1020 cryocoolers; Er3Ni or ErNi spheres are used as the low temperature regenerators. The refrigerators are operated almost continuously; one has been in service for 4 years. Maintenance consists of disassembling the cold heads every 1 to 2 years to clean out water and dust. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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