ELMy H-mode with high- betaNand high- beta p in JT-60U
- 1 July 1994
- journal article
- Published by IOP Publishing in Plasma Physics and Controlled Fusion
- Vol. 36 (7A) , A123-A128
- https://doi.org/10.1088/0741-3335/36/7a/015
Abstract
By modification of current and heat deposition profiles, the integrated core plasma performance was improved in ELMy H-mode. In a quasi steady state, beta p approximately 2.5-3, beta N approximately 2.5-3.1 and H-factor approximately 1.8-2.1 were sustained simultaneously under the full current drive condition (bootstrap current 55%, beam driven current 45% at Ip=0.5MA). The achievable beta p value and the energy confinement performance increases systematically with safety factor at the edge qeff and a high qeff operation (qeff>6) is required to obtain favorable integrated performance. To obtain these improved high beta ELMy plasmas, it is essential to control MHD activities; suppression of beta p-collapse and control of ELM activity.Keywords
This publication has 4 references indexed in Scilit:
- Effects of the safety factor and the internal inductance on MHD activities and energy confinement in JT-60UNuclear Fusion, 1993
- Ripple-trapped loss of neutral-beam-injected fast ions in JT-60UPhysical Review Letters, 1992
- Numerical analysis of 2D MHD equilibrium with non-inductive plasma current in tokamaksJournal of Computational Physics, 1992
- Effect of Toroidal Field Ripple on Fast Ion Behavior in a TokamakJournal of the Physics Society Japan, 1981