STUDIES ON HIGH DENSITY RFP PLASMAS IN THE ETA-BETA II EXPERIMENT
0P Plasmas in the ETA-BETA II A new series of experiments with optimized matching of the I-phi and B-phi wave forms has been performed. The fast initial density drop (pump-out) observed in previous experiments is avoided and a gradual density decay throughout the current pulse is obtained, with higher density values for a given filling density. A clearer picture of plasma behaviour is obtained by improved diagnostics which allow a more careful analysis. Experiments at various filling densities confirm the existence of an optimum I/N range outside which colder plasmas are obtained. A comparison between the results of ETA-BETA II and TPE-1R(M) is attempted and the key difference appears to be the Z-eff value (much lower in ETA-BETA II than in TPE). An active clamp applied on both the poloidal and toroidal circuits (although too small to allow full current sustainment) increases the current duration by a factor up to two and shows the different roles of field and current controls. Some preliminary analysis of the current termination phase is also reported.
Bibliographic Reference: 9TH INTERNATIONAL CONFERENCE PLASMA PHYSICS AND CONTROLLED NUCLEAR FUSION, BALTIMORE (USA), SEPT. 1-8, 1982 PP. 619-639 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 31398 ORA
Availability: Can be ordered online
Record Number: 1989122066100 / Last updated on: 1987-01-01
Available languages: en