Abstract
A continuous closed cycle cooler to operate at a base temperature below 300 mK has been successfully designed and tested by Chase Research Cryogenics in collaboration with Cardiff University Astronomical Instrumentation Group. This compact, relatively low-cost unit has temperature and heat load capability of around 200 μW at 340 mK, and 400 μW at 450 mK. Here we discuss the suitability of this unit for precooling a miniature self-contained dilution module to produce a cryogen-free cooling platform capable of achieving a useful cooling power at temperatures of less than 100 mK.
Highlights
Ultra-low temperatures are required for a wide range of applications in photonics, quantum computing and astronomy [1]
Miniature dilutor modules are pre-cooled using single-shot, closed-cycle sorption coolers, which only remain at the temperatures required for operation of the dilution module for a limited duration
We have investigated the performance of the dilution module to measure its cooling power and to assess its performance under various operational conditions, including under load and with different coolant compositions and volumes
Summary
Ultra-low temperatures are required for a wide range of applications in photonics, quantum computing and astronomy [1]. Self-contained dilution modules capable of providing just a few microWatts of cooling power, at operating temperatures between 50 and 100 mK, have been around for many years and several different designs have been described [2]. Miniature dilutor modules are pre-cooled using single-shot, closed-cycle sorption coolers, which only remain at the temperatures required for operation of the dilution module for a limited duration. This limits the utility of the system since initial cooldown times can be rather long and cycling the single-shot pre-cooler will disrupt the dilution circulation. With adequate continuous precooling a miniature dilutor would be capable (in principle) of operating at ultra-low temperatures indefinitely
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