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Development of New Concept In-Vessel Cryo-Sorption Pump for LHD Closed Helical Divertor

Takanori MURASE, Gen MOTOJIMA, Hirohiko TANAKA, Tomohiro MORISAKI and Masahiro MITA¹⁾

National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan

1)

KYODO International Corporation, 2-10-9 Miyazaki, Miyamae-ku, Kawasaki 216-0033, Japan

(Received 18 January 2016 / Accepted 23 February 2016 / Published 17 March 2016)

Abstract

The in-vessel cryo-sorption pump for the Closed Helical Divertor (CHD) in the Large Helical Device (LHD) has been developed at the National Institute for Fusion Science (NIFS). An organic adhesive-free bonding technique for attaching activated carbon pellets to a copper cold panel was invented, which employs the indium solder with intermediate materials. The prototype of the CHD with the newly developed cryo-sorption pump was installed in the LHD. Performance of the cryo-sorption pump was estimated in the LHD vacuum vessel. A satisfactory result of the maximum pumping speed up to 9 m³/s was obtained with one divertor module in one toroidal section (10% of the torus), which is equivalent to the required pumping speed of the CHD.

Copyright (c) 2016 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

in-vessel cryo-sorption pump, inorganic adhesion, closed helical divertor, LHD

DOI: 10.1585/pfr.11.1205030

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References

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