[Table of Contents]

Plasma and Fusion Research

Volume 9, 3402097 (2014)

Regular Articles

Fast-Ion Losses due to Externally Applied Static Magnetic Perturbations in the Large Helical Device
Kunihiro OGAWA1), Mitsutaka ISOBE1,2), Kazuo TOI1), Akihiro SHIMIZU1), Masaki OSAKABE1) and LHD Experiment Group1)
1)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
2)
The Graduate University for Advanced Studies (SOKENDAI), Toki 509-5292, Japan
(Received 26 November 2013 / Accepted 19 May 2014 / Published 4 July 2014)

Abstract

In this study, using a scintillator-based lost fast-ion probe, we have measured fast-ion losses in the Large Helical Device, in which the losses were caused by externally applied static magnetic perturbations (MPs) having small amplitudes. Energy and pitch-angle resolved measurements reveal that the effects of MPs on fast-ion losses occur in both high and low pitch-angle regions. A Lorentz orbit-following calculation indicates that static MPs can change the orbits of fast ions, which can enhance the transport/loss of fast ions.

Keywords

fast ion, Large Helical Device, lost-fast ion probe, static magnetic perturbation

DOI: 10.1585/pfr.9.3402097

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This paper may be cited as follows:

Kunihiro OGAWA, Mitsutaka ISOBE, Kazuo TOI, Akihiro SHIMIZU, Masaki OSAKABE and LHD Experiment Group, Plasma Fusion Res. 9, 3402097 (2014).