Development of magnetic sensors in JT-60 upgrade

Author

Neyatani, Y. ; Hosogane, N. ; Matsukawa, M. ; Ninomiya, H. ; Horiike, H. ; Tsuji, S.

Author_Institution

JAERI, Ibaraki, Japan

fYear

1991

fDate

30 Sep-3 Oct 1991

Firstpage

1183

Abstract

JT-60 (JAERI Tokamak-60) was upgraded to double the plasma current to 6 MA with replacement of the vacuum vessel and the poloidal field coils. For this upgrade, new magnetic sensors were developed. Sixteen pairs of Mirnov coils, and fifteen one-turn loops were installed for plasma control. A Mirnov coil which was made of double Inconel tubes was developed for MHD (magnetohydrodynamic) activity measurement. These tubes work as protection from heat load and as an electrostatic shield, while the coil successfully keeps the frequency response from exceeding 100 kHz by means of a slit on the tubes. The diamagnetic loops were installed with a accuracy of ±2 mm in the poloidal plane inside the vacuum vessel. The Rogowski coil was made of a mineral insulation cable of 0.5-mm diameter and achieved a total linkage area twice that of the original JT-60

Keywords

fusion reactor instrumentation; plasma diagnostic techniques; Inconel tubes; Mirnov coils; Rogowski coil; diamagnetic loops; electrostatic shield; magnetic sensors; mineral insulation cable; one-turn loops; plasma control; poloidal field coils; vacuum vessel; Cable insulation; Coils; Electrostatic measurements; Frequency response; Magnetic field measurement; Magnetic sensors; Magnetohydrodynamics; Minerals; Plasma measurements; Protection;

fLanguage

English

Publisher

ieee

Conference_Titel

Fusion Engineering, 1991. Proceedings., 14th IEEE/NPSS Symposium on

Conference_Location

San Diego, CA

Print_ISBN

0-7803-0132-3

Type

conf

DOI

10.1109/FUSION.1991.218660

Filename

218660