Onset condition for ELMs in JT-60U
- 1 August 1996
- journal article
- Published by IOP Publishing in Plasma Physics and Controlled Fusion
- Vol. 38 (8) , 1387-1391
- https://doi.org/10.1088/0741-3335/38/8/041
Abstract
For the standard shape of JT-60U at low triangularity , the onset condition for giant ELMs is clearly correlated with the high-n ballooning limit in the first stability regime over wide ranges of plasma parameters (, ...). The limit of the normalized edge pressure gradient (-parameter) increases with elongation (1.5 - 1.8) and internal inductance . Recently, a new connection of the poloidal field coils enabled us to scan triangularity from the original value of up to (currently limited at MA). The -scan showed that the limit of edge density, edge pressure and the -parameter increase with . When both and are high (, ), minute-grassy ELMs appear. The edge -parameter during the minute-grassy ELMs can be higher than that for the onset of giant ELMs.Keywords
This publication has 3 references indexed in Scilit:
- Non-inductively current driven H mode with high betaNand high betapvalues in JT-60UNuclear Fusion, 1994
- ELMy H-mode with high- betaNand high- beta p in JT-60UPlasma Physics and Controlled Fusion, 1994
- Modifications in turbulence and edge electric fields at the L–H transition in the DIII-D tokamakPhysics of Fluids B: Plasma Physics, 1991