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Technological Breakthrough in MSSL Milli-Kelvin Cryocooler

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Figure 1: Chromium Potassium Alum refrigerant in the cryostat for testing

A 22 gram Chromium Potassium Alum (CPA) paramagnetic refrigerant has been demonstrated to cool from 4 Kelvin to 178 millikelvin in only 30 seconds; an unprecedented achievement made possible by detailed thermal modelling and the development of a superconducting magnet capable of ramping from zero to two Tesla (20,000 gauss) in 30 seconds and vice versa. This is a key technological breakthrough in MSSL’s EPSRC funded millikelvin cryocooler development.

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