Performance studies of Cryocooler based cryosorption pumps with indigenous activated carbons for fusion applications

Kasthurirengan, S and Vivek, G A and Verma, Ravi and Behera, Upendra and Udgata, Swarup and Gangradey, Ranjana (2017) Performance studies of Cryocooler based cryosorption pumps with indigenous activated carbons for fusion applications. In: 26th International Cryogenic Engineering Conference / International Cryogenic Materials Conference, MAR 07-11, 2016, Indian Cryogen Council, New Delhi, INDIA.

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Abstract

Cryosorption pumps are the only solution for pumping helium and hydrogen in fusion systems, due to their high pumping speeds and suitability in harsh environments. Their development requires the right Activated Carbons (ACs) and suitable adhesives to bind them to metallic panels with liquid helium (LHe) flow channels. However, their performance evaluation will require large quantities of LHe. Alternatively, these pumps can be built with small size panels adhered with ACs and cooled by a cryocooler. The paper describes the development of a cryopump using a commercial cryocooler (Sumitomo RDK415D), with 1.5W@4.2 K, integrated with small size AC panel mounted on 2(nd) stage, with the 1(st) stage acting as radiation shield. Under no load, the cryopump reaches the ultimate pressure of 2.1E-7 mbar. The pump is built using panels with different indigenously developed ACs such as granules, pellets, ACF-FK2 and activated carbon of knitted IPR cloth. We present the experimental results of pumping speeds for gases such as nitrogen, argon and helium using the procedures outlined by American Vacuum Society (AVS). These studies will enable to arrive at the right ACs and adhesives for the development of large scale cryosorption pumps with liquid helium flow.

Item Type:	Conference Proceedings
Series.:	IOP Conference Series-Materials Science and Engineering
Publisher:	IOP PUBLISHING LTD, DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
Additional Information:	Copy right for this article belongs to the IOP PUBLISHING LTD, DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
Department/Centre:	Division of Physical & Mathematical Sciences > Centre for Cryogenic Technology
Date Deposited:	20 May 2017 07:13
Last Modified:	20 May 2017 07:18
URI:	http://eprints.iisc.ac.in/id/eprint/56966

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