PROPERTIES, CONTROL AND ICR HEATING OF THE PLASMA IN TEXTOR
The accessible parameter range, impurity contents and susceptibility to ICRH power input depend on conditioning procedures and on the surface materials of limiter and liner. Combinations of stainless steel and inconel, "carbonized" stainless steel and "carbonized" inconel and "carbonized" graphite and "carbonized" inconel have been compared. Results on j(r) derived from polarimetry are presented and discussed. ICR heating has been extended to the 2 MW level and to the minority/second harmonic mode. The tau-E-scaling still remains comparable to that of the L-regime. With the Ansatz E = tau-OHP'-OH taudA-uXP-RF the best fit gives tau-AUX(ms) = (6015)I-p(MA). The degradation of tau-p is similar to that of tau-E; fluxes of neutral hydrogen, carbon and oxygen and the value of n-e close to the limiter increase with the RF power. The application of ICRH increases the particle removal by the pump limiter ALT-I as a consequence of the reduced tau-p and the resulting increased plasma flux into the entrance throat. This effect compensates potential difficulties for pump limiter application from the heat load on the limiter head which increases more than linearly with P-RF. First experiments with localized perturbation coils for boundary "ergodization" resulted in a pronounced satationary island pattern in the boundary layer.
Bibliographic Reference: 13TH EUROPEAN CONFERENCE ON CONTROLLED FUSION AND PLASMA PHYSICS, SCHLIERSEE (GERMANY), APRIL 14-18, 1986 PLASMA PHYSICS AND CONTROLLED FUSION, VOL. 28 (1986) NO. 9A, PP. 1413-1428
Record Number: 1989126037001 / Last updated on: 1989-01-01
Available languages: en