Particle control in Tore Supra with pump limiters for long pulse operation
Low helium concentration in burning fusion plasmas over long time scales requires the development of quasi continuous particle exhaust capabilities to control 5 - 10 % of the recycling flux. Since these devices receive the convected flux, they have to sustain permanently large power fluxes (10 MW/m2). The electron temperature at their surface must remain low (not more than 20 eV) while compensation for particle exhaust must be provided. The study demonstrates that significant exhaust efficiencies, epsilon = 5 % can be achieved on Tore Supra using a test pump limiter. Yet certain conditions, high plasma density, a sufficient separation between plasma boundary and boronisation, can all assist in increasing efficiencies. Particle balance modelling highlights conditions with little effect on core density, such as high edge electron temperatures, but which have indirect effects on inner wall particle desorption.
Bibliographic Reference: Paper presented: 14th International Conference on Plasma Physics and Controlled Nuclear Fusion Research, Würzburg (DE), September 30 - October 7, 1992
Availability: Available from (1) as Paper EN 37024 ORA
Record Number: 199211519 / Last updated on: 1994-11-29
Original language: en
Available languages: en