Samenvatting
While present plasma scenarios rely on self generated plasma conditions,
active control with ergodic divertor coils provide the means to operate
in H-mode with divertor and SOL plasma conditions that are compatible
with the technical constraints. The stochastisation of field lines in
the vicinity of the separatrix, will produce a localized enhancement of
electron heat transport. This will provide a control on the edge
temperature (and thus pressure) barriers. Consequently, the local
current profile, which is essentially bootstrap, will be modified.
H-mode edge barriers can be controlled and type I Elms avoided in this
way. Such controls are required for advanced regimes. The paper will
discuss this in light of the theoretical and experimental advances of
the last years: Tore Supra experiments gave evidence of the fine tuning
capability of the perturbation on a well defined magnetic configuration
while JFT-2M experiments showed that the edge stochastisation of the X
point configuration has widened the operating windows of the type III
ELM regime. The possible implementations of such control in a medium
size tokamak (DIII-D) and eventually on ITER will also be described.
Originele taal-2 | Engels |
---|---|
Pagina's (van-tot) | 1314-1320 |
Tijdschrift | Journal of Nuclear Materials |
Volume | 313 |
DOI's | |
Status | Gepubliceerd - 1 mrt. 2003 |
Extern gepubliceerd | Ja |