Density limit in FTU tokamak during ohmic operation
An understanding of the physical mechanisms that regulate the density limit in a tokamak is very important in view of a future fusion reactor. Density enters as a factor in the figure of merit needed to achieve a burning plasma. However, a high edge density is needed to avoid excessive corrosion of the first walls and to limit the impurity influx into the hot plasma core. FTU is a medium size, high field tokamak with a stainless steel vacuum chamber and an inconel poloidal limiter. In this paper, experiments on the density limit in FTU with ohmic heating are described and evidence is given to support the theory that the limit is on the edge density. The relation of the density limit to a simple model based on the SOL power balance valid for a limiter tokamak is also discussed.
Bibliographic Reference: Paper presented: 20th EPS Conference on Controlled Fusion and Plasma Physics, Lisboa (PT), July 26-30, 1993
Availability: Available from (1) as Paper EN 37546 ORA
Record Number: 199310874 / Last updated on: 1994-11-29
Original language: en
Available languages: en