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Title: Noninductive Current Drive and Steady-State Operation in JT-60U

Abstract

Studies on noninductive current drive (CD) and development of an integrated steady-state high performance operation in JT-60 are reviewed. Experiments on lower hybrid current drive (LHCD) in JT-60 have shown a large noninductive current up to 3.6 MA, high current drive efficiency of 3.5 x 10{sup 19} m{sup -2}A/W, and a flexible current profile control. Basic studies on LH waves, such as an effect of accessibility condition, fast electron behaviors, and so on, in JT-60 have contributed to understanding LHCD physics. Significant progress in neutral beam current drive (NBCD) has been made in JT-60 by testing the performance of negative ion-based (N) neutral beam injection (NBI) (N-NBI). The CD efficiency of {approx}1.5 x 10{sup 19} m{sup -2}A/W and negative ion-based neutral beam (N-NB) driven current of {approx}1 MA have been demonstrated in N-NBCD. Strongly localized noninductive driven current by electron cyclotron current drive (ECCD) was identified with a fundamental O-mode scheme from a low field side injection. ECCD in JT-60 has shown CD efficiency of 0.5 x 10{sup 19} m{sup -2}A/W and EC-driven current of 0.2 MA. Modification of local current profile was demonstrated and was used for suppression of neoclassical tearing mode. Based on these developments, two integrated steady-statemore » operation scenarios were developed in JT-60, which are reversed magnetic shear (R/S) plasmas and high {beta}p ELMy H-mode. In these operation regimes, discharges have been sustained near the steady-state current profile under full noninductive current drive (High {beta}p; HH{sub y2} {approx} 1.4 and {beta}{sub N} {approx} 2.5 with N-NB, R/S; HH{sub y2} {approx} 2.2 and {beta}{sub N} {approx} 2 with f{sub BS} {approx} 80%). High performance plasmas with a high n{sub Do}{tau}{sub E}T{sub io} and at high normalized density were also produced under fully noninductive condition in high {beta}p ELMy H-mode and R/S mode.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »; ; ;  [1] « less
  1. Japan Atomic Energy Research Institute (Japan)
Publication Date:
OSTI Identifier:
20845852
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; ANIONS; BEAM CURRENTS; ECR CURRENT DRIVE; EDGE LOCALIZED MODES; EFFICIENCY; ELECTRONS; H-MODE PLASMA CONFINEMENT; JT-60 TOKAMAK; JT-60U TOKAMAK; LOWER HYBRID CURRENT DRIVE; MAGNETIC FIELD CONFIGURATIONS; NEOCLASSICAL TRANSPORT THEORY; NEUTRAL ATOM BEAM INJECTION; PERFORMANCE; PLASMA; PLASMA DENSITY; REVERSED SHEAR; STEADY-STATE CONDITIONS; TEARING INSTABILITY

Citation Formats

Ushigusa, K, Ide, S, Oikawa, T, Suzuki, T, Kamada, Y, Fujita, T, Ikeda, Y, Naito, O, Matsuoka, M, Kondoh, T, Isayama, A, Seki, M, Imai, T, Sakamoto, K, Umeda, N, Hamamatsu, K, Fujii, T, Uehara, K, Yamamoto, T, Miura, Y, Kikuchi, M, Kuriyama, M, and Ninomiya, H. Noninductive Current Drive and Steady-State Operation in JT-60U. United States: N. p., 2002. Web.
Ushigusa, K, Ide, S, Oikawa, T, Suzuki, T, Kamada, Y, Fujita, T, Ikeda, Y, Naito, O, Matsuoka, M, Kondoh, T, Isayama, A, Seki, M, Imai, T, Sakamoto, K, Umeda, N, Hamamatsu, K, Fujii, T, Uehara, K, Yamamoto, T, Miura, Y, Kikuchi, M, Kuriyama, M, & Ninomiya, H. Noninductive Current Drive and Steady-State Operation in JT-60U. United States.
Ushigusa, K, Ide, S, Oikawa, T, Suzuki, T, Kamada, Y, Fujita, T, Ikeda, Y, Naito, O, Matsuoka, M, Kondoh, T, Isayama, A, Seki, M, Imai, T, Sakamoto, K, Umeda, N, Hamamatsu, K, Fujii, T, Uehara, K, Yamamoto, T, Miura, Y, Kikuchi, M, Kuriyama, M, and Ninomiya, H. Sun . "Noninductive Current Drive and Steady-State Operation in JT-60U". United States.
@article{osti_20845852,
title = {Noninductive Current Drive and Steady-State Operation in JT-60U},
author = {Ushigusa, K and Ide, S and Oikawa, T and Suzuki, T and Kamada, Y and Fujita, T and Ikeda, Y and Naito, O and Matsuoka, M and Kondoh, T and Isayama, A and Seki, M and Imai, T and Sakamoto, K and Umeda, N and Hamamatsu, K and Fujii, T and Uehara, K and Yamamoto, T and Miura, Y and Kikuchi, M and Kuriyama, M and Ninomiya, H},
abstractNote = {Studies on noninductive current drive (CD) and development of an integrated steady-state high performance operation in JT-60 are reviewed. Experiments on lower hybrid current drive (LHCD) in JT-60 have shown a large noninductive current up to 3.6 MA, high current drive efficiency of 3.5 x 10{sup 19} m{sup -2}A/W, and a flexible current profile control. Basic studies on LH waves, such as an effect of accessibility condition, fast electron behaviors, and so on, in JT-60 have contributed to understanding LHCD physics. Significant progress in neutral beam current drive (NBCD) has been made in JT-60 by testing the performance of negative ion-based (N) neutral beam injection (NBI) (N-NBI). The CD efficiency of {approx}1.5 x 10{sup 19} m{sup -2}A/W and negative ion-based neutral beam (N-NB) driven current of {approx}1 MA have been demonstrated in N-NBCD. Strongly localized noninductive driven current by electron cyclotron current drive (ECCD) was identified with a fundamental O-mode scheme from a low field side injection. ECCD in JT-60 has shown CD efficiency of 0.5 x 10{sup 19} m{sup -2}A/W and EC-driven current of 0.2 MA. Modification of local current profile was demonstrated and was used for suppression of neoclassical tearing mode. Based on these developments, two integrated steady-state operation scenarios were developed in JT-60, which are reversed magnetic shear (R/S) plasmas and high {beta}p ELMy H-mode. In these operation regimes, discharges have been sustained near the steady-state current profile under full noninductive current drive (High {beta}p; HH{sub y2} {approx} 1.4 and {beta}{sub N} {approx} 2.5 with N-NB, R/S; HH{sub y2} {approx} 2.2 and {beta}{sub N} {approx} 2 with f{sub BS} {approx} 80%). High performance plasmas with a high n{sub Do}{tau}{sub E}T{sub io} and at high normalized density were also produced under fully noninductive condition in high {beta}p ELMy H-mode and R/S mode.},
doi = {},
journal = {Fusion Science and Technology},
issn = {1536-1055},
number = 2,3,
volume = 42,
place = {United States},
year = {2002},
month = {9}
}