Mechanical design and analysis of JT-60U ICRF launcher

Author

Fujii, T. ; Saigusa, M. ; Moriyama, S. ; Annoh, K. ; Shinozaki, S. ; Terakado, M. ; Kimura, H. ; Ohta, M. ; Texuka, M. ; Wakabayashi, K. ; Ohmori, J. ; Miki, N. ; Kobayashi, N. ; Itoh, K.

Author_Institution

Naka Fusion Res. Establ., JAERI, Ibaraki, Japan

fYear

1991

fDate

30 Sep-3 Oct 1991

Firstpage

107

Abstract

An upgrading of the ICRF (ion cyclotron range of frequencies) heating system for JT-60 (JAERI Tokamak-60) was performed during the modification of the JT-60 tokamak, which, after the upgrade, allowed 6 MA of plasma current and 100 m³ of plasma volume. In the upgrade, the old ICRF launcher was replaced by two new ones in order to inject more power (~4.5 MW). The new launcher has severe design conditions of high heat flux from the plasma (max. 0.4 MW/m²) and large electromagnetic force induced by plasma disruption (6 MA/5 ms). The total torque acting on the launcher by the electromagnetic force is about 35 t-m. Structural analysis was carried out to evaluate the integrity of the launcher, particularly of the feedthrough and the Faraday shield, under these severe conditions. The launchers are now being installed on the horizontal ports of the JT-60U vacuum vessel, which are movable by 40 mm in a radial direction

Keywords

antennas; antennas in plasma; fusion reactor theory and design; plasma radiofrequency heating; 4.5 MW; Faraday shield; ICRF heating; ICRF launcher; JT-60U; design conditions; electromagnetic force; feedthrough; heat flux; integrity; mechanical design; plasma disruption; structural analysis; Antenna feeds; Coaxial components; Electromagnetic forces; Electromagnetic heating; Plasmas; Power generation; Radio frequency; Tokamaks; Torque; Transmission line antennas;

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.1991.218814

Filename

218814