Stationary burning : Analysis of profile effects on the required exhaust efficiency and the permitted helium particle confinement time
In order to define the requirements of the helium exhaust system and of the permitted particle confinement, the burn condition for D-T plasmas has been derived in a recent paper, taking the ratio of the global alpha particle confinement time to the energy confinement time as a figure of merit which characterises the prevailing confinement and exhaust regime. It was shown that for an ignited and stationary burning D-T plasma, the value of this ratio needs to remain sufficiently below 15 without any other impurities or below 10 for typical impurity concentrations. In the present paper, the effect of different radial profile shapes for densities and temperatures is analysed by applying appropriate shape factors. It is shown that the above condition remains valid over a wide range of realistic plasma profiles. Therefore, the values given above can be used as realistic criteria to assess experimentally the quality of specific exhaust schemes and confinement regimes.
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 176 & 177 (1990) pp. 756-762
Record Number: 199110790 / Last updated on: 1994-12-02
Original language: en
Available languages: en