[Table of Contents]

Plasma and Fusion Research

Volume 9, 3402078 (2014)

Regular Articles

Development of a Local Current Diagnostic using a Small Rogowski Coil for a Spherical Tokamak Plasma in TST-2
Hirokazu FURUI, Yoshihiko NAGASHIMA1), Yuich TAKASE, Akira EJIRI, Hidetoshi KAKUDA, Masateru SONEHARA, Takuya OOSAKO, Naoto TSUJII, Junichi HIRATSUKA, Kazuhiro IMAMURA, Takuma INADA, Keishun NAKAMURA, Ayaka NAKANISHI, Takahiro SHINYA, Hiro TOGASHI, Shintarou TSUDA, Takuma WAKATSUKI and Takashi YAMAGUCHI
The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa city, Chiba 277-8561, Japan
1)
Kyushu University, 6-1 Kasuga-koen, Kasuga city, Fukuoka 816-8580, Japan
(Received 10 December 2013 / Accepted 8 April 2014 / Published 10 June 2014)

Abstract

A local current diagnostic using a small Rogowski coil was developed in the TST-2 spherical tokamak device (R = 0.38 m, a = 0.25 m, Bt = 0.3 T, Ip = 0.1 MA). A Rogowski coil is a cost effective tool for local current diagnostic that can detect the current signal directly. A new small Rogowski coil (outer diameter = 20 mm, inner diameter = 12 mm, number of turns = 360) with small sensitivity to external magnetic fields, such as Bt and Bp, was developed and successfully installed in the TST-2. The measured local current at the edge just inside the last closed flux surface for ohmic heating was about 15 A.

Keywords

Rogowski coil, external magnetic effect, local current diagnostic, local current density profile, spherical tokamak

DOI: 10.1585/pfr.9.3402078

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This paper may be cited as follows:

Hirokazu FURUI, Yoshihiko NAGASHIMA, Yuich TAKASE, Akira EJIRI, Hidetoshi KAKUDA, Masateru SONEHARA, Takuya OOSAKO, Naoto TSUJII, Junichi HIRATSUKA, Kazuhiro IMAMURA, Takuma INADA, Keishun NAKAMURA, Ayaka NAKANISHI, Takahiro SHINYA, Hiro TOGASHI, Shintarou TSUDA, Takuma WAKATSUKI and Takashi YAMAGUCHI, Plasma Fusion Res. 9, 3402078 (2014).