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Title: Fusion Plasma Performance and Confinement Studies on JT-60 and JT-60U

Abstract

Fusion plasma performance and confinement studies on JT-60 and JT-60U are reviewed. With the main aim of providing a physics basis for ITER and the steady-state tokamak reactors, JT-60/JT-60U has been developing and optimizing the operational concepts, and extending the discharge regimes toward sustainment of high integrated performance in the reactor relevant parameter regime. In addition to achievement of high fusion plasma performances such as the equivalent breakeven condition (Q{sub DT}{sup eq} up to 1.25) and a high fusion triple product n{sub D}(0){tau}{sub E}T{sub i}(0) = 1.5 x 10{sup 21} m{sup -3}skeV, JT-60U has demonstrated the integrated performance of high confinement, high {beta}{sub N}, full non-inductive current drive with a large fraction of bootstrap current. These favorable performances have been achieved in the two advanced operation regimes, the reversed magnetic shear (RS) and the weak magnetic shear (high-{beta}{sub p}) ELMy H modes characterized by both internal transport barriers (ITB) and edge transport barriers (ETB). The key factors in optimizing these plasmas towards high integrated performance are control of profiles of current, pressure, rotation, etc. utilizing a variety of heating, current drive, torque input, and particle control capabilities and high triangularity operation. As represented by discovery of ITBs (density ITB inmore » the central pellet mode, ion temperature ITB in the high-{beta}{sub p} mode, and electron temperature ITB in the reversed shear mode), confinement studies in JT-60/JT-60U have been emphasizing freedom and also restriction of radial profiles of temperature and density. In addition to characterization of confinement and analyses of transport properties of the OH, the L-mode, the H-mode, the pellet mode, the high-{beta}{sub p} mode, and the RS mode, JT-60U has clarified formation conditions, spatial structures and dynamics of edge and internal transport barriers, and evaluated effects of repetitive MHD events on confinement such as sawteeth and ELMs. Through these studies, JT-60U has demonstrated applicability of the high confinement modes to ITER and the steady-state tokamak reactors.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1];  [2] « less
  1. Japan Atomic Energy Research Institute (Japan)
  2. Hokkaido University (Japan)
Publication Date:
OSTI Identifier:
20845851
Resource Type:
Journal Article
Resource Relation:
Journal Name: Fusion Science and Technology; 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)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BOOTSTRAP CURRENT; CHARGED-PARTICLE TRANSPORT; EDGE LOCALIZED MODES; ELECTRON TEMPERATURE; H-MODE PLASMA CONFINEMENT; ION TEMPERATURE; ITER TOKAMAK; JT-60 TOKAMAK; JT-60U TOKAMAK; L-MODE PLASMA CONFINEMENT; MAGNETIC FIELD CONFIGURATIONS; MAGNETOHYDRODYNAMICS; NON-INDUCTIVE CURRENT DRIVE; PERFORMANCE; PLASMA; PLASMA DENSITY; PLASMA HEATING; REVERSED SHEAR; SAWTOOTH OSCILLATIONS; STEADY-STATE CONDITIONS; THERMAL BARRIERS

Citation Formats

Kamada, Y., Fujita, T., Ishida, S., Kikuchi, M., Ide, S., Takizuka, T., Shirai, H., Koide, Y., Fukuda, T., Hosogane, N., Tsuchiya, K., Hatae, T., Takenaga, H., Sato, M., Nakamura, H., Naito, O., Asakura, N., Kubo, H., Higashijima, S., Miura, Y., Yoshino, R., Shimizu, K., Ozeki, T., Hirayama, T., Mori, M., Sakamoto, Y., Kawano, Y., Isayama, A., Ushigusa, K., Ikeda, Y., Kimura, H., Fujii, T., Imai, T., Nagami, M., Takeji, S., Oikawa, T., Suzuki, T., Nakano, T., Oyama, N., Sakurai, S., Konoshima, S., Sugie, T., Tobita, K., Kondoh, T., Tamai, H., Neyatani, Y., Sakasai, A., Kusama, Y., Itami, K., Shimada, M., Ninomiya, H., and Urano, H. Fusion Plasma Performance and Confinement Studies on JT-60 and JT-60U. United States: N. p., 2002. Web.
Kamada, Y., Fujita, T., Ishida, S., Kikuchi, M., Ide, S., Takizuka, T., Shirai, H., Koide, Y., Fukuda, T., Hosogane, N., Tsuchiya, K., Hatae, T., Takenaga, H., Sato, M., Nakamura, H., Naito, O., Asakura, N., Kubo, H., Higashijima, S., Miura, Y., Yoshino, R., Shimizu, K., Ozeki, T., Hirayama, T., Mori, M., Sakamoto, Y., Kawano, Y., Isayama, A., Ushigusa, K., Ikeda, Y., Kimura, H., Fujii, T., Imai, T., Nagami, M., Takeji, S., Oikawa, T., Suzuki, T., Nakano, T., Oyama, N., Sakurai, S., Konoshima, S., Sugie, T., Tobita, K., Kondoh, T., Tamai, H., Neyatani, Y., Sakasai, A., Kusama, Y., Itami, K., Shimada, M., Ninomiya, H., & Urano, H. Fusion Plasma Performance and Confinement Studies on JT-60 and JT-60U. United States.
Kamada, Y., Fujita, T., Ishida, S., Kikuchi, M., Ide, S., Takizuka, T., Shirai, H., Koide, Y., Fukuda, T., Hosogane, N., Tsuchiya, K., Hatae, T., Takenaga, H., Sato, M., Nakamura, H., Naito, O., Asakura, N., Kubo, H., Higashijima, S., Miura, Y., Yoshino, R., Shimizu, K., Ozeki, T., Hirayama, T., Mori, M., Sakamoto, Y., Kawano, Y., Isayama, A., Ushigusa, K., Ikeda, Y., Kimura, H., Fujii, T., Imai, T., Nagami, M., Takeji, S., Oikawa, T., Suzuki, T., Nakano, T., Oyama, N., Sakurai, S., Konoshima, S., Sugie, T., Tobita, K., Kondoh, T., Tamai, H., Neyatani, Y., Sakasai, A., Kusama, Y., Itami, K., Shimada, M., Ninomiya, H., and Urano, H. Sun . "Fusion Plasma Performance and Confinement Studies on JT-60 and JT-60U". United States.
@article{osti_20845851,
title = {Fusion Plasma Performance and Confinement Studies on JT-60 and JT-60U},
author = {Kamada, Y. and Fujita, T. and Ishida, S. and Kikuchi, M. and Ide, S. and Takizuka, T. and Shirai, H. and Koide, Y. and Fukuda, T. and Hosogane, N. and Tsuchiya, K. and Hatae, T. and Takenaga, H. and Sato, M. and Nakamura, H. and Naito, O. and Asakura, N. and Kubo, H. and Higashijima, S. and Miura, Y. and Yoshino, R. and Shimizu, K. and Ozeki, T. and Hirayama, T. and Mori, M. and Sakamoto, Y. and Kawano, Y. and Isayama, A. and Ushigusa, K. and Ikeda, Y. and Kimura, H. and Fujii, T. and Imai, T. and Nagami, M. and Takeji, S. and Oikawa, T. and Suzuki, T. and Nakano, T. and Oyama, N. and Sakurai, S. and Konoshima, S. and Sugie, T. and Tobita, K. and Kondoh, T. and Tamai, H. and Neyatani, Y. and Sakasai, A. and Kusama, Y. and Itami, K. and Shimada, M. and Ninomiya, H. and Urano, H.},
abstractNote = {Fusion plasma performance and confinement studies on JT-60 and JT-60U are reviewed. With the main aim of providing a physics basis for ITER and the steady-state tokamak reactors, JT-60/JT-60U has been developing and optimizing the operational concepts, and extending the discharge regimes toward sustainment of high integrated performance in the reactor relevant parameter regime. In addition to achievement of high fusion plasma performances such as the equivalent breakeven condition (Q{sub DT}{sup eq} up to 1.25) and a high fusion triple product n{sub D}(0){tau}{sub E}T{sub i}(0) = 1.5 x 10{sup 21} m{sup -3}skeV, JT-60U has demonstrated the integrated performance of high confinement, high {beta}{sub N}, full non-inductive current drive with a large fraction of bootstrap current. These favorable performances have been achieved in the two advanced operation regimes, the reversed magnetic shear (RS) and the weak magnetic shear (high-{beta}{sub p}) ELMy H modes characterized by both internal transport barriers (ITB) and edge transport barriers (ETB). The key factors in optimizing these plasmas towards high integrated performance are control of profiles of current, pressure, rotation, etc. utilizing a variety of heating, current drive, torque input, and particle control capabilities and high triangularity operation. As represented by discovery of ITBs (density ITB in the central pellet mode, ion temperature ITB in the high-{beta}{sub p} mode, and electron temperature ITB in the reversed shear mode), confinement studies in JT-60/JT-60U have been emphasizing freedom and also restriction of radial profiles of temperature and density. In addition to characterization of confinement and analyses of transport properties of the OH, the L-mode, the H-mode, the pellet mode, the high-{beta}{sub p} mode, and the RS mode, JT-60U has clarified formation conditions, spatial structures and dynamics of edge and internal transport barriers, and evaluated effects of repetitive MHD events on confinement such as sawteeth and ELMs. Through these studies, JT-60U has demonstrated applicability of the high confinement modes to ITER and the steady-state tokamak reactors.},
doi = {},
journal = {Fusion Science and Technology},
number = 2,3,
volume = 42,
place = {United States},
year = {Sun Sep 15 00:00:00 EDT 2002},
month = {Sun Sep 15 00:00:00 EDT 2002}
}