Plasma and Fusion Research

Volume 11, 2402110 (2016)

Regular Articles

Development of Magnetic Flux Surface Measurement Method on TOKASTAR-2

Yusuke SHIMOOKA, Hideki ARIMOTO, Takaaki FUJITA, Atsushi OKAMOTO, Tatsuya SAKITO, Hiromasa ITOU, Kenji MURAOKA, Ryoichi SUGIOKA, Kouhei YASUDA¹⁾ and Ryoma YOKOYAMA¹⁾

: Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
1): School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan

(Received 30 November 2015 / Accepted 28 April 2016 / Published 16 September 2016)

Abstract

The measurement method of magnetic flux surfaces on TOKASTAR-2 was developed. The electron gun was designed and fabricated. Calculation of the orbit of electrons showed that low energy of injected electrons, typically less than 50 eV, was proper for the measurement to suppress large deviation of the electron orbits from the magnetic flux surfaces. The preliminary experiment for the method using a fluorescent screen showed that the acceleration voltage of 80 V was required and we need significant improvement of the electron gun to apply the method using a fluorescent screen to TOKASTAR-2. The experiment for the method using a probe showed that the required acceleration voltage was 10 V so we found that the method using a probe was proper for a small plasma confinement device with weak magnetic field like TOKASTAR-2.

Keywords

TOKASTAR, tokamak, stellarator, magnetic flux surface, electron gun

DOI: 10.1585/pfr.11.2402110

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