Local current density measurement using a Rogowski probe in Tokyo Spherical Tokamak-2

H Furui; Y Nagashima; Y Takase; A Ejiri; H Kakuda; M Sonehara; T Oosako; N Tsujii; J Hiratsuka; K Imamura; T Inada; K Nakamura; A Nakanishi; T Shinya; H Togashi; S Tsuda; T Wakatsuki; T Yamaguchi

doi:10.1063/1.4887277

Local current density measurement using a Rogowski probe in Tokyo Spherical Tokamak-2

Rev Sci Instrum. 2014 Nov;85(11):11D813. doi: 10.1063/1.4887277.

Authors

H Furui¹, Y Nagashima², Y Takase¹, A Ejiri¹, H Kakuda¹, M Sonehara¹, T Oosako¹, N Tsujii¹, J Hiratsuka¹, K Imamura¹, T Inada¹, K Nakamura¹, A Nakanishi¹, T Shinya¹, H Togashi¹, S Tsuda¹, T Wakatsuki¹, T Yamaguchi¹

Affiliations

¹ The University of Tokyo, 5-1-5 Kasshiwanoha, Kashiwa, Chiba 277-8561, Japan.
² Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8680, Japan.

PMID: 25430226
DOI: 10.1063/1.4887277

Abstract

A Rogowski probe consisting of a small multi-layer Rogowski coil, five magnetic pick-up coils, and a Langmuir probe was developed to measure the local current density and its direction. It can be moved along the major radius and can be turned around its axis. This probe was used to measure the current density profile near the last closed flux surface of Ohmic plasmas in Tokyo Spherical Tokamak-2. The current density profile was measured successfully with a signal to noise ratio of greater than 20.