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Title: ICRF heating of plasmas with internal transport barrier during reversed magnetic shear experiments in JT-60U

Abstract

Ion cyclotron range of frequency, ICRF, waves were injected into plasmas with an internal transport barrier, ITB, during reversed magnetic shear, RS, operations in JT-60U to study the electron heating and the low central fueling effects to plasmas with ITB. Steep gradients at the ITB in the electron temperature, T{sub e}, and in the ion temperature, T{sub i}, profiles were sustained during ICRF heating. However, the density gradient was degraded during ICRF heating with low NBI power which corresponds to a low central particle fueling. We have found that the energy confinement time in the ICRF heated RS plasmas was increased compared to normal shear discharges, whereas the particle confinement time was the same as in normal shear discharges.

Authors:
; ; ; ; ; ; ; ; ; ; ;  [1]
  1. Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-machi, Naka-gun, Ibaraki-ken, 311-0193 (Japan)
Publication Date:
OSTI Identifier:
21210433
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: 10.1063/1.59740; (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; CHARGED-PARTICLE TRANSPORT; CONFINEMENT TIME; ELECTRON TEMPERATURE; ELECTRONS; ICR HEATING; ION TEMPERATURE; JT-60U TOKAMAK; MAGNETIC FIELD CONFIGURATIONS; PLASMA; PLASMA DENSITY; REVERSED SHEAR; RF SYSTEMS; SHEAR; THERMAL BARRIERS

Citation Formats

Iwase, M., Koide, Y., Tobita, K., Moriyama, S., Takenaga, H., Fujita, T., Shirai, H., Kusama, Y., Nemoto, M., Oikawa, T., Kramer, G. J., and Kimura, H. ICRF heating of plasmas with internal transport barrier during reversed magnetic shear experiments in JT-60U. United States: N. p., 1999. Web. doi:10.1063/1.59740.
Iwase, M., Koide, Y., Tobita, K., Moriyama, S., Takenaga, H., Fujita, T., Shirai, H., Kusama, Y., Nemoto, M., Oikawa, T., Kramer, G. J., & Kimura, H. ICRF heating of plasmas with internal transport barrier during reversed magnetic shear experiments in JT-60U. United States. doi:10.1063/1.59740.
Iwase, M., Koide, Y., Tobita, K., Moriyama, S., Takenaga, H., Fujita, T., Shirai, H., Kusama, Y., Nemoto, M., Oikawa, T., Kramer, G. J., and Kimura, H. Mon . "ICRF heating of plasmas with internal transport barrier during reversed magnetic shear experiments in JT-60U". United States. doi:10.1063/1.59740.
@article{osti_21210433,
title = {ICRF heating of plasmas with internal transport barrier during reversed magnetic shear experiments in JT-60U},
author = {Iwase, M. and Koide, Y. and Tobita, K. and Moriyama, S. and Takenaga, H. and Fujita, T. and Shirai, H. and Kusama, Y. and Nemoto, M. and Oikawa, T. and Kramer, G. J. and Kimura, H.},
abstractNote = {Ion cyclotron range of frequency, ICRF, waves were injected into plasmas with an internal transport barrier, ITB, during reversed magnetic shear, RS, operations in JT-60U to study the electron heating and the low central fueling effects to plasmas with ITB. Steep gradients at the ITB in the electron temperature, T{sub e}, and in the ion temperature, T{sub i}, profiles were sustained during ICRF heating. However, the density gradient was degraded during ICRF heating with low NBI power which corresponds to a low central particle fueling. We have found that the energy confinement time in the ICRF heated RS plasmas was increased compared to normal shear discharges, whereas the particle confinement time was the same as in normal shear discharges.},
doi = {10.1063/1.59740},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 485,
place = {United States},
year = {1999},
month = {9}
}