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Performances of single and two-stage pulse tube cryocoolers under different vacuum levels with and without thermal radiation shields

Kasthurirengan, S and Behera, Upendra and Nadig, Durgesh S and Krishnamoorthy, V (2012) Performances of single and two-stage pulse tube cryocoolers under different vacuum levels with and without thermal radiation shields. In: Advances in Cryogenic Engineering: Transactions of the Cryogenic Engineering Conference - CEC, 13–17 June 2011, Spokane, Washington, USA, pp. 1632-1639.

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Official URL: http://dx.doi.org/

Abstract

Single and two-stage Pulse Tube Cryocoolers (PTC) have been designed, fabricated and experimentally studied. The single stage PTC reaches a no-load temperature of similar to 29 K at its cold end, the two-stage PTC reaches similar to 2.9 K in its second stage cold end and similar to 60 K in its first stage cold end. The two-stage Pulse Tube Cryocooler provides a cooling power of similar to 250 mW at 4.2 K. The single stage system uses stainless steel meshes along with Pb granules as its regenerator materials, while the two-stage PTC uses combinations of Pb along with Er3Ni/HoCu2 as the second stage regenerator materials. Normally, the above systems are insulated by thermal radiation shields and mounted inside a vacuum chamber which is maintained at high vacuum. To evaluate the performance of these systems in the possible conditions of loss of vacuum with and without radiation shields, experimental studies have been performed. The heat-in-leak under such severe conditions has been estimated from the heat load characteristics of the respective stages. The experimental results are analyzed to obtain surface emissivities and effective thermal conductivities as a function of interspace pressure.

Item Type: Conference Proceedings
Additional Information: Copyright of this article belongs to American Institute of Physics.
Keywords: Pulse Tube; Cryocooler; Regenerator; Gas Conduction; Radiation; Emissivity
Department/Centre: Division of Physical & Mathematical Sciences > Centre for Cryogenic Technology
Depositing User: Id for Latest eprints
Date Deposited: 05 Mar 2013 08:13
Last Modified: 05 Mar 2013 08:13
URI: http://eprints.iisc.ac.in/id/eprint/45412

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