[Table of Contents]

Plasma and Fusion Research

Volume 8, 1202104 (2013)

Rapid Communications


Observation of Direct Ion Heating in Double-Pulsing CHI in Helicity Injected Spherical Torus Plasmas
Takafumi HANAO, Hidetoshi HIRONO, Takahiro HYOBU, Kengo ITO, Keisuke MATSUMOTO, Takashi NAKAYAMA, Yusuke KIKUCHI, Naoyuki FUKUMOTO and Masayoshi NAGATA
Graduate School of Engineering, University of Hyogo, Hyogo 671-2280, Japan
(Received 18 April 2013 / Accepted 24 May 2013 / Published 15 August 2013)

Abstract

Anomalous ion heating has been observed for the first time during flux/current amplification by double-pulsing coaxial helicity injection (CHI) in the helicity injected spherical torus (HIST) device. Doppler ion temperature increases significantly near the separatrix on the inboard side during the second CHI pulse, whereas electron temperature remains constant. The experimental results indicate that selective ion heating may be associated with viscous damping of poloidal flows driven by the CHI pulse.


Keywords

coaxial helicity injection, anomalous ion heating, spherical torus, viscous flow damping, current amplification

DOI: 10.1585/pfr.8.1202104


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This paper may be cited as follows:

Takafumi HANAO, Hidetoshi HIRONO, Takahiro HYOBU, Kengo ITO, Keisuke MATSUMOTO, Takashi NAKAYAMA, Yusuke KIKUCHI, Naoyuki FUKUMOTO and Masayoshi NAGATA, Plasma Fusion Res. 8, 1202104 (2013).