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Long-Term Monitoring of Hydraulic Characteristics of LHD Poloidal Coils

Kazuya TAKAHATA, Sadatomo MORIUCHI, Kouki OOBA, Toshiyuki MITO and Shinsaku IMAGAWA

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

(Received 30 November 2011 / Accepted 24 January 2012 / Published 17 February 2012)

Abstract

We present a fourteen-year data summary of the hydraulic characteristics of the large helical device (LHD) poloidal coils. The superconductors of the poloidal coils are cable-in-conduit conductors (CICC) cooled by circulated supercritical helium. The long-term operation of the LHD demonstrates that the initial hydraulic characteristics can be maintained without flow obstruction. Fine mesh filters installed at the inlet trapped impurities during cool-down of the coils, confirmed by monitoring the pressure drop of the filters. The filters have an important role in removing particles of impurities in the helium and maintaining the hydraulic characteristics of the coils.

Copyright (c) 2012 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

LHD, superconducting magnet, cable-in-conduit conductor, hydraulic characteristic, friction factor

DOI: 10.1585/pfr.7.2405008

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References

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This paper may be cited as follows:

Kazuya TAKAHATA, Sadatomo MORIUCHI, Kouki OOBA, Toshiyuki MITO and Shinsaku IMAGAWA, Plasma Fusion Res. 7, 2405008 (2012).