Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 71: Superconductivity: Cryodetectors and Cryotechnique
TT 71.3: Vortrag
Donnerstag, 23. März 2017, 15:30–15:45, HSZ 201
Development and Implementation of a New Compact Low-Noise Pulse Tube Cryocooler for Temperatures of 5 - 10 K — •Bernd Schmidt1,2, Matthias Vorholzer1,2, Marc Dietrich1, Jens Falter1, André Schirmeisen1,2, and Günter Thummes1,2 — 1TransMIT-Center for Adaptive Cryotechnology and Sensors, Giessen, Germany — 2Institute of Applied Physics, Justus-Liebig-University Giessen, Germany
Two-stage Pulse Tube Cryocoolers (PTC) are closed-cycle machines which provide cooling power near 4 K without the necessity of regularly buying and refilling Helium. In addition, PTC show lower intrinsic disturbances than other closed-cycle cryocoolers.
Since the invention of 4 K two-stage PTCs, further developments aimed at high cooling powers in order to compete with GM-cryocoolers. However, sensitive applications suffer from intrinsic disturbances of the cryocooler. To address this issue, the development of PTCs with small cooling powers is essential.
In this talk we present the development of a new two-stage GM-type PTC, designed to work with only 1 kW input power. After modeling the PTC, a first prototype was fabricated and then operated and optimized. Up to now, the PTC reaches a minimum temperature of about 4 K and provides a cooling power of 50 mW at 5 K, which is sufficient for cooling small cryoelectronic or optical devices. A comparison of the simulated and measured cooling performance will also be presented.
Funding via the BMBF joint project "SUSY" (grant No 13N13444) is gratefully acknowledged.