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Title: Recent RF activities on JT-60U

Abstract

Recently, the JT-60U has employed ECRF system in addition to LHCD and ICRF systems. Three types of RF experiments on JT-60U have been performed. A reversed magnetic shear (R/S) configuration with internal transport barrier (ITB) was successfully maintained for 4.7 s in a quasi-steady state by LHCD in addition to the bootstrap current, where all profiles of temperature and plasma current were almost stationary. On the normal operation without heating during plasma current ramp-up, high electron temperature (T{sub e0}{approx}10 keV) with a strongly peaked profile was produced by LHCD alone at the density of {approx}0.5x10{sup 19} m{sup -3}. This peaked temperature profile was featured by a reduction in core density. The central electron temperature and density slowly changed in several seconds. The performances of ICRF (2{omega}{sub CH}) on the R/S configuration were also studied. Degradation of confinement of energetic particles was observed probably due to the large banana orbit loss. An 110 GHz ECRF system has been operated on JT-60U. Its gyrotron has successfully generated power at the level of up to 830 kW for 300 ms and is under conditioning. On the initial operation, the power of 620 kW was injected into plasmas. The central electron temperature increased frommore » 3 keV to 5.5 keV at n{sub e}{approx}0.6x10{sup 19} m{sup -3}. A controllability of local heating was also demonstrated by the poloidally steerable mirror.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]
  1. Japan Atomic Energy Research Institute, Naka Fusion Research Establishment Mukoyama 801-1, Naka-machi, Naka-gun, Ibaraki-ken, 311-0193 (Japan) (and others)
Publication Date:
OSTI Identifier:
21210466
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 485; Journal Issue: 1; Conference: 13. topical conference on radio frequency power in plasmas, Annapolis, MD (United States), 12-14 Apr 1999; Other Information: DOI: 10.1063/1.59748; (c) 1999 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BANANA REGIME; BOOTSTRAP CURRENT; CHARGED-PARTICLE TRANSPORT; ECR HEATING; ELECTRON TEMPERATURE; GHZ RANGE; ICR HEATING; JT-60U TOKAMAK; KEV RANGE; LOWER HYBRID CURRENT DRIVE; MAGNETIC FIELD CONFIGURATIONS; PLASMA; PLASMA DENSITY; REVERSED SHEAR; RF SYSTEMS; STEADY-STATE CONDITIONS; TEMPERATURE MEASUREMENT; THERMAL BARRIERS

Citation Formats

Ikeda, Y., Fujita, T., Hamamatus, K., Ide, S., Imai, T., Isayama, A., Iwase, M., Kasugai, A., Kondoh, T., Kusama, Y., Moriyama, S., Naito, O., Nemoto, M., Oikawa, T., Sakamoto, K., Seki, M., Shinozaki, S., Simono, M., Takahashi, T., and Terakado, M. Recent RF activities on JT-60U. United States: N. p., 1999. Web. doi:10.1063/1.59748.
Ikeda, Y., Fujita, T., Hamamatus, K., Ide, S., Imai, T., Isayama, A., Iwase, M., Kasugai, A., Kondoh, T., Kusama, Y., Moriyama, S., Naito, O., Nemoto, M., Oikawa, T., Sakamoto, K., Seki, M., Shinozaki, S., Simono, M., Takahashi, T., & Terakado, M. Recent RF activities on JT-60U. United States. doi:10.1063/1.59748.
Ikeda, Y., Fujita, T., Hamamatus, K., Ide, S., Imai, T., Isayama, A., Iwase, M., Kasugai, A., Kondoh, T., Kusama, Y., Moriyama, S., Naito, O., Nemoto, M., Oikawa, T., Sakamoto, K., Seki, M., Shinozaki, S., Simono, M., Takahashi, T., and Terakado, M. Mon . "Recent RF activities on JT-60U". United States. doi:10.1063/1.59748.
@article{osti_21210466,
title = {Recent RF activities on JT-60U},
author = {Ikeda, Y. and Fujita, T. and Hamamatus, K. and Ide, S. and Imai, T. and Isayama, A. and Iwase, M. and Kasugai, A. and Kondoh, T. and Kusama, Y. and Moriyama, S. and Naito, O. and Nemoto, M. and Oikawa, T. and Sakamoto, K. and Seki, M. and Shinozaki, S. and Simono, M. and Takahashi, T. and Terakado, M.},
abstractNote = {Recently, the JT-60U has employed ECRF system in addition to LHCD and ICRF systems. Three types of RF experiments on JT-60U have been performed. A reversed magnetic shear (R/S) configuration with internal transport barrier (ITB) was successfully maintained for 4.7 s in a quasi-steady state by LHCD in addition to the bootstrap current, where all profiles of temperature and plasma current were almost stationary. On the normal operation without heating during plasma current ramp-up, high electron temperature (T{sub e0}{approx}10 keV) with a strongly peaked profile was produced by LHCD alone at the density of {approx}0.5x10{sup 19} m{sup -3}. This peaked temperature profile was featured by a reduction in core density. The central electron temperature and density slowly changed in several seconds. The performances of ICRF (2{omega}{sub CH}) on the R/S configuration were also studied. Degradation of confinement of energetic particles was observed probably due to the large banana orbit loss. An 110 GHz ECRF system has been operated on JT-60U. Its gyrotron has successfully generated power at the level of up to 830 kW for 300 ms and is under conditioning. On the initial operation, the power of 620 kW was injected into plasmas. The central electron temperature increased from 3 keV to 5.5 keV at n{sub e}{approx}0.6x10{sup 19} m{sup -3}. A controllability of local heating was also demonstrated by the poloidally steerable mirror.},
doi = {10.1063/1.59748},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 485,
place = {United States},
year = {1999},
month = {9}
}