Development of a Local Current Diagnostic using a Small Rogowski Coil for a Spherical Tokamak Plasma in TST-2

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; Takashi YAMAGUCHI

doi:10.1585/pfr.9.3402078

Regular Articles

Development of a Local Current Diagnostic using a Small Rogowski Coil for a Spherical Tokamak Plasma in TST-2

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, Takashi YAMAGUCHI

Author information

Hirokazu FURUI
The University of Tokyo
Yoshihiko NAGASHIMA
Kyushu University
Yuich TAKASE
The University of Tokyo
Akira EJIRI
The University of Tokyo
Hidetoshi KAKUDA
The University of Tokyo
Masateru SONEHARA
The University of Tokyo
Takuya OOSAKO
The University of Tokyo
Naoto TSUJII
The University of Tokyo
Junichi HIRATSUKA
The University of Tokyo
Kazuhiro IMAMURA
The University of Tokyo
Takuma INADA
The University of Tokyo
Keishun NAKAMURA
The University of Tokyo
Ayaka NAKANISHI
The University of Tokyo
Takahiro SHINYA
The University of Tokyo
Hiro TOGASHI
The University of Tokyo
Shintarou TSUDA
The University of Tokyo
Takuma WAKATSUKI
The University of Tokyo
Takashi YAMAGUCHI
The University of Tokyo

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

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2014 Volume 9 Pages 3402078

DOI https://doi.org/10.1585/pfr.9.3402078

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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, B_t= 0.3 T, I_p= 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 B_tand B_p, 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.

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