NIST Hybrid Cooler Attains 2 Kelvin

By CSA Editor

Online — NIST scientists have devised a novel hybrid system for cooling superconducting nanowire single-photon detectors (SNSPD).

It uses a pulse-tube refrigerator cooled to 10 Kelvin (K) to precool a Joule-Thomson cryocooler that can then reach 2 K.

That level of cooling has typically been achieved with liquid helium systems that are not only costly, complicated and large, but that also demand considerable expertise to operate and maintain safely.

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