Dry dilution refrigerator with 4He-1K-loop

TL;DR

This paper discusses the design, implementation, and performance of a cryogen-free dilution refrigerator with a 4He-1K-stage, aimed at high cooling capacity applications in quantum technology and astrophysics.

Contribution

It introduces a novel cryogen-free dilution refrigerator with a 4He-1K-stage, demonstrating high cooling power and versatility for quantum and astrophysical experiments.

Findings

Cooling powers up to 100 mW at 1 K achieved

Lowest temperature reached was 4.3 mK

Different 1K-loop configurations tested successfully

Abstract

In this article we summarize experimental work on cryogen-free 3He/4He dilution refrigerators which, in addition to the dilution refrigeration circuit, are equipped with a 4He-1K-stage. This type of DR becomes worth considering when high cooling capacities are needed at T ~ 1 K to cool cold amplifiers and heat sink cables. In our application, the motivation for the construction of this type of cryostat was to do experiments on superconducting quantum circuits for quantum information technology and quantum simulations. In other work, DRs with 1K-stage were proposed for astro-physical cryostats. For neutron scattering research, a top-loading cryogen-free DR with 1K-stage was built which was equipped with a standard commercial dilution refrigeration insert. Cooling powers of up to 100 mW have been reached with our 1K-stage, but higher refrigeration powers were achieved with more powerful pulse tube cryocoolers and higher 4He circulation rates in the 1K-loop. Several different versions of a 1K-loop have been tested in combination with a dilution refrigeration circuit. The lowest temperature of our DR was 4.3 mK.