Abstract
The 250W@4.5K refrigerator, which is localized at Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, is composed of the compressor, turbo-expanders, cryogenic heat exchangers, JT valve and electric heater. This refrigerator operates stably and meets the design target after the test and commission. This paper describes the investigation on the optimization of the cool down scheme and the performance analysis of the refrigerator.
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