1. Final Acceptance Tests of Helium Refrigerator for Wendelstein 7-X
- Author
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M. Ressel, U. Nuesslein, Chandra Prakash Dhard, S. Raatz, and M. Nagel
- Subjects
Cold circulator ,Power mode ,Materials science ,Nuclear engineering ,Mode (statistics) ,Helium refrigerator ,Cryogenics for fusion ,Physics and Astronomy(all) ,Helium-3 refrigerator ,Acceptance testing ,Wendelstein 7-X ,Cold compressor ,Standby power - Abstract
Following successful installation and commissioning, final acceptance tests were carried out on the helium refrigerator for Wendelstein 7-X.The tests were carried out for the normal operating modes i.e. peak power mode (3.4K), standard mode(3.9K), short standby mode (< 10K) and long standby mode (< 100K).Besides the normal modes, the transient modes including, cool-down and warm-up, auto interchanging between various modes and the purging modes were tested.In addition, the handling of quench, emergency signals such as cryostat vacuum break,utility failure, alarm and trip signals were checked.
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