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When one fabricates a magnet using MgB2 or HTS conductors, the operating temperature of the magnet can be increased into the temperature range from about 15 to 30K. This temperature range is between the triple-point (13.8K) and the critical point of para-hydrogen (32.3K). Hydrogen has excellent heat transfer properties both as a liquid and as a gas at low temperature. The heat of vaporization of hydrogen...
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