skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: The 110-GHz Electron Cyclotron Range of Frequency System on JT-60U: Design and Operation

Abstract

The electron cyclotron range of frequency (ECRF) system was designed and operated on the JT-60U to locally heat and control plasmas. The frequency of 110 GHz was adopted to inject the fundamental O-mode from the low field side with an oblique injection angle. The system is composed of four 1 MW-level gyrotrons, four transmission lines, and two antennae. The gyrotron is featured by a collector potential depression (CPD) and a gaussian beam output through a diamond window. The CPD enables JAERI to drive the gyrotron under the condition of the main DC voltage of 60 kV without a thyristor regulation. The gaussian mode from the gyrotron is effectively transformed to HE{sub 11} mode in the 31.75 mm diameter corrugated waveguide. About 75% of the output power of the gyrotrons can be injected into plasmas through the waveguides about 60 m in length. There are two antennae to control the deposition position of the EC wave during a plasma discharge. One is connected with three RF lines to steer the EC beams in the poloidal direction. The other is to control the EC beam in the toroidal and poloidal directions by two steerable mirrors.On the operation in 2000, the power ofmore » 1.5 to 1.6 MW for 3 s was successfully injected into plasmas using three gyrotrons. Local profile control was demonstrated by using the antennae. This capability was devoted to improve the plasma performance such as high T{sub e} production more than 15 keV and suppression of the MHD activities. In 2001, the fourth gyrotron, whose structure was improved for long pulse operation, has been installed for a total injection power of {approx}3 MW.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]
  1. Japan Atomic Energy Research Institute (Japan)
Publication Date:
OSTI Identifier:
20845863
Resource Type:
Journal Article
Journal Name:
Fusion Science and Technology
Additional Journal Information:
Journal Volume: 42; Journal Issue: 2,3; Other Information: Copyright (c) 2006 American Nuclear Society (ANS), United States, All rights reserved. http://epubs.ans.org/; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1536-1055
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANTENNAS; CONTROL; DESIGN; ECR HEATING; ELECTRIC POTENTIAL; ELECTRON CYCLOTRON-RESONANCE; GHZ RANGE; JT-60U TOKAMAK; KEV RANGE; MAGNETOHYDRODYNAMICS; MICROWAVE AMPLIFIERS; OPERATION; PERFORMANCE; PLASMA; POWER TRANSMISSION LINES; WAVEGUIDES

Citation Formats

Ikeda, Y, Kasugai, A, Moriyama, S, Kajiwara, K, Seki, M, Tsuneoka, M, Takahashi, K, Anno, K, Hamamatsu, K, Hiranai, S, Ikeda, Yu, Imai, T, Sakamoto, K, Shimono, M, Shinozaki, S, Terakado, M, Yamamoto, T, Yokokura, K, and Fujii, T. The 110-GHz Electron Cyclotron Range of Frequency System on JT-60U: Design and Operation. United States: N. p., 2002. Web.
Ikeda, Y, Kasugai, A, Moriyama, S, Kajiwara, K, Seki, M, Tsuneoka, M, Takahashi, K, Anno, K, Hamamatsu, K, Hiranai, S, Ikeda, Yu, Imai, T, Sakamoto, K, Shimono, M, Shinozaki, S, Terakado, M, Yamamoto, T, Yokokura, K, & Fujii, T. The 110-GHz Electron Cyclotron Range of Frequency System on JT-60U: Design and Operation. United States.
Ikeda, Y, Kasugai, A, Moriyama, S, Kajiwara, K, Seki, M, Tsuneoka, M, Takahashi, K, Anno, K, Hamamatsu, K, Hiranai, S, Ikeda, Yu, Imai, T, Sakamoto, K, Shimono, M, Shinozaki, S, Terakado, M, Yamamoto, T, Yokokura, K, and Fujii, T. Sun . "The 110-GHz Electron Cyclotron Range of Frequency System on JT-60U: Design and Operation". United States.
@article{osti_20845863,
title = {The 110-GHz Electron Cyclotron Range of Frequency System on JT-60U: Design and Operation},
author = {Ikeda, Y and Kasugai, A and Moriyama, S and Kajiwara, K and Seki, M and Tsuneoka, M and Takahashi, K and Anno, K and Hamamatsu, K and Hiranai, S and Ikeda, Yu and Imai, T and Sakamoto, K and Shimono, M and Shinozaki, S and Terakado, M and Yamamoto, T and Yokokura, K and Fujii, T},
abstractNote = {The electron cyclotron range of frequency (ECRF) system was designed and operated on the JT-60U to locally heat and control plasmas. The frequency of 110 GHz was adopted to inject the fundamental O-mode from the low field side with an oblique injection angle. The system is composed of four 1 MW-level gyrotrons, four transmission lines, and two antennae. The gyrotron is featured by a collector potential depression (CPD) and a gaussian beam output through a diamond window. The CPD enables JAERI to drive the gyrotron under the condition of the main DC voltage of 60 kV without a thyristor regulation. The gaussian mode from the gyrotron is effectively transformed to HE{sub 11} mode in the 31.75 mm diameter corrugated waveguide. About 75% of the output power of the gyrotrons can be injected into plasmas through the waveguides about 60 m in length. There are two antennae to control the deposition position of the EC wave during a plasma discharge. One is connected with three RF lines to steer the EC beams in the poloidal direction. The other is to control the EC beam in the toroidal and poloidal directions by two steerable mirrors.On the operation in 2000, the power of 1.5 to 1.6 MW for 3 s was successfully injected into plasmas using three gyrotrons. Local profile control was demonstrated by using the antennae. This capability was devoted to improve the plasma performance such as high T{sub e} production more than 15 keV and suppression of the MHD activities. In 2001, the fourth gyrotron, whose structure was improved for long pulse operation, has been installed for a total injection power of {approx}3 MW.},
doi = {},
journal = {Fusion Science and Technology},
issn = {1536-1055},
number = 2,3,
volume = 42,
place = {United States},
year = {2002},
month = {9}
}