SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 13: Focus Session: New Perspectives for Adiabatic Demagnetization Refrigeration in the Kelvin and sub-Kelvin Range (joint session TT/MA)

MA 13.6: Vortrag

Dienstag, 28. März 2023, 12:15–12:30, HSZ 03

ADR based sub-Kelvin cryostats for applied quantum technologies — •Pau Jorba¹, Felix Rucker¹, Steffen Säubert¹, Alexander Regnat¹, Jan Spallek¹, and Christian Pfleiderer² — ¹kiutra GmbH, Flößergasse 2, D-81369 München, Germany — ²Physik-Department, Technische Universität München, D-85748 Garching, Germany

In view of the increasing demand for the cooling of quantum electronic devices, the development of scalable cooling solutions that provide low temperatures independent of rare helium-3 will be mandatory for the adoption and commercial use of next-generation quantum technologies. We present novel ADR based sub-Kelvin cryostats¹ specifically developed for the characterization and operation of quantum devices. We address how known challenges of ADR systems such as limited hold time and magnetic stray fields can be overcome. Specifically, we describe how continuous sub-Kelvin cooling and wide-range temperature control can be achieved by combining multiple ADR units and mechanical thermal switches. We also present a novel sample loader mechanism² that allows taking advantage of the solid-state nature of ADR and to cool samples from room temperature to 100 mK in less than 3 hours.

[1] Regnat et al. (2018) Cryogen-free cooling apparatus (EP 3163222). European Patent Office.

[2] Spallek et al. (2022) System and method for inserting a sample into a chamber (EP 3632560). European Patent Office.