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Photographs of the cryogen cooling apparatus. a) The inlet ports of the refrigerators (black units in upper corners) are connected to the precisely controlled bearing and drive gas regulators. Vacuum jacketed lines connect the refrigerators, heat exchanger, and NMR probe. b) The nickel-plated copper coil of the heat exchanger with 7 turns. c) The cold heat exchange assembly showing the 8″copper can.
