Studies of the Far SOL Plasmas and Main Wall Plasma Interaction in DIII-D
Abstract
Far SOL plasma parameters in DIII-D depend strongly on the discharge conditions and confinement regime. In L-mode, cross-field transport increases with the discharge density and elevates the far SOL density, thus increasing plasma-wall interaction. Plasma ion fluxes to the low field side (LFS) of the main chamber wall increase with decreasing plasma current and with decreasing outer wall gap. In H-mode, between edge localized modes (ELMs) plasma fluxes to the LFS wall are about an order of magnitude lower than those in comparable density L-mode. During ELMs wall fluxes increase to, or above the L-mode levels. Depending on the discharge conditions ELMs are responsible for 30%-90% of the total ion flux to the LFS chamber wall. Possible wall erosion due to the plasma fluxes is investigated.
- Publication:
-
APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- November 2004
- Bibcode:
- 2004APS..DPPNP1021R