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

Journal Article · Mon Sep 20 04:00:00 EDT 1999 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.59740· OSTI ID:21210433

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 ^[1]

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1. Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-machi, Naka-gun, Ibaraki-ken, 311-0193 (Japan)

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.

• OSTI ID: 21210433
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 485; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

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