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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...
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