Transition of Toroidal Alfvén Eigenmode to Global Alfvén Eigenmode in CHS Heliotron/Torsatron Plasmas Heated by Neutral Beam Injection

Manabu TAKECHI; Go MATSUNAGA; Kazuo TOI; Mitsutaka ISOBE; Takashi MINAMI; Kenji TANAKA; Shin NISHIMURA; Chihiro TAKAHASHI; Shoichi OKAMURA; Keisuke MATSUOKA

doi:10.1585/jspf.78.1273

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Transition of Toroidal Alfvén Eigenmode to Global Alfvén Eigenmode in CHS Heliotron/Torsatron Plasmas Heated by Neutral Beam Injection

Manabu TAKECHI, Go MATSUNAGA, Kazuo TOI, Mitsutaka ISOBE, Takashi MINAMI, Kenji TANAKA, Shin NISHIMURA, Chihiro TAKAHASHI, Shoichi OKAMURA, Keisuke MATSUOKA

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Keywords: toroidal Alfvén eigenmode, global Alfvén eigenmode, eigenmode transition, rotational transform, helical plasma, tokamak plasma

JOURNAL FREE ACCESS

2002 Volume 78 Issue 12 Pages 1273-1274

DOI https://doi.org/10.1585/jspf.78.1273

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Abstract

A transition of a core localized type toroidal Alfvén eigenmode with n = 1 toroidal mode number to two n = 1 global Alfvén eigenmodes was observed in NBI-heated plasmas in the Compact Helical System (CHS) heliotron torsatron. This transition phenomenon is interpreted based on the temporal evolution of the rotational transform near the plasma center caused by the increase in the beam-driven current.

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