Plasma and Fusion Research

Volume 11, 1205030 (2016)

Rapid Communications

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
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)


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.


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

DOI: 10.1585/pfr.11.1205030


  • [1] K.M. Schaubel et al., Advances in Cryogenic Engineering 39, 1583 (1994).
  • [2] Q.S. Hu et al., Fusion Eng. Des. 85, 1508 (2010).
  • [3] Japanese patent pending number 2014-209086 (in Japanese).
  • [4] S. Masuzaki et al., Plasma Fusion Res. 6, 1202007 (2011).
  • [5] T. Morisaki et al., Nucl. Fusion 53, 063014 (2013).
  • [6] S. Masuzaki et al., Fusion Eng. Des. 85, 940 (2010).