Zobrazeno 1 - 10
of 173
pro vyhledávání: '"G. Thummes"'
Publikováno v:
Cryogenics. 88:129-131
The development of 4 K two-stage pulse tube cryocoolers (PTCs) is commonly aimed at high cooling powers in order to compete with GM-cryocoolers. However, more sensitive applications still suffer from intrinsic disturbances of the cryocooler. To addre
Publikováno v:
Cryogenics. 69:44-49
He-3 is generally recognized for its ability to provide more excellent thermophysical performance than He-4, especially in the 4 K temperature range. However, this was not always the case in our preliminary experiments on a three-stage Stirling-type
A previously designed cryogenic thermal heat switch for space applications has been optimized for low mass, high structural stability, and reliability. The heat switch makes use of the large linear thermal expansion coefficient (CTE) of the thermopla
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::600167bf1b0c28d2b90b9176e9f193a4
Publikováno v:
Cryogenics. 49:457-462
High-power Stirling-type pulse tube coolers (PTCs) are promising candidates for cooling HTS devices and gas liquefaction or separation applications. Nevertheless, till now most high-power Stirling-type PTCs are not able to reach a refrigeration tempe
Publikováno v:
International Journal of Heat and Mass Transfer. 50:2795-2804
Transverse asymmetry in the temperature profile of the regenerator in a Stirling-type pulse tube cooler as observed in experiments was analysed in a numerical study. The asymmetry was reproduced using a one-dimensional model of the cooler where the r
Publikováno v:
Cryogenics. 47:306-314
A single stage Stirling-type pulse tube cryocooler driven by a 10 kW-class linear compressor was built and tested. During operation an azimuthal temperature inhomogeneity around the circumference of the regenerator was observed indicating a significa
Publikováno v:
Journal of Applied Physics, 98(3):034911, 034911-1/8. American Institute of Physics
In this contribution a superfluid vortex cooler (SVC) is described. A SVC is a cooling device, the operation of which is based on the special properties of superfluid helium (He II). The SVC is small, simple, has no moving parts, and is gravity indep
Publikováno v:
Cryogenics. 44:809-816
Regenerative cryocoolers that employ 4 He as working fluid can only reach a lowest temperature of about 2 K. This limitation can be overcome by the use of 3 He as working fluid. Here we report on the performance of a two-stage pulse tube cooler that
Publikováno v:
Superconductor Science and Technology. 17:S135-S139
We report on the design and testing of a cryogen-free superconducting magnet that is conductively cooled by means of a two-stage pulse tube cryocooler (PTC). The cooler provides a cooling power of 0.4 W at 4.2 K, when operated on a helium compressor
Autor:
L.M. Qiu, Johannes Kohlmann, G. Wende, M. Schubert, J. Niemeyer, G. Thummes, H.-G. Meyer, Y. Kucukkaplan, L. Fritzsch, J. Scheerer, H. Hofmeister, Torsten May
Publikováno v:
IEEE Transactions on Appiled Superconductivity. 13:915-918
For a more wide-spread use of Josephson voltage standards, cryogen-free operation, by means of an appropriate closed-cycle refrigerator, is highly desirable. In this work we present a low-noise pulse tube cooler (PTC) that is capable to cool the volt