Firm claims a 'dry' cryogenics first

Nov 8, 2007

The UK firm Cryogenic claims to be the first to deliver a superconducting magnet and cryogenic measurement system that does not require a constant supply of liquid helium in order to operate at very low temperatures. Instead, the "cryogen-free" or "dry" system is cooled using Gifford–McMahon (GM) coolers, which are closed systems that do not need to be constantly topped up with liquid helium. To avoid this, GM coolers rely instead on the compression and expansion of a small quantity of helium gas.

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