THE DESIGN OF THE AUXILIARY POWER SUPPLIES FOR THE TEXTOR NEUTRAL INJECTORS
The auxiliary power supplies deliver the power of 24*(10 VAC * 60 A) for heating the filaments and the arc power of 24*(150 VDC * 80 A) for the bucket type plasma source of the TEXTOR neutral injector. Both supplies influence the operating characteristic of the plasma source which should be operated in the emission limited regime of the arc current. It is essential for achieving a stable operating point to match the output values of both supplies and to heat up the filaments to the very same temperature i.e. to control the amplitude of heating voltages within a margin of +- 50 mV. The paper describes the filament supply meeting these requirements. It consists of 8 AC - AC converter modules each connected to a single three phase filament transformer at the injector. The design features and the technical data are given. A further important issue is the joint operation of filament supply and arc supply, both located side to side on a high voltage Faraday's cage being insulated against a voltage of 70 kV. The cage is surrounded by a grounded shield. The capacitive and inductive coupling of these supplies with their housing, coaxial leads, and transformers can be treated by electrical network computations. Results of such computations are presented showing the transient voltage distribution of the high voltage deck and of the auxiliary supplies during a grid breakdown.
Bibliographic Reference: 11TH SYMPOSIUM ON FUSION ENGINEERING, AUSTIN (TEXAS), NOV. 18-22, 1985 VOL. 1, PP. 685-688 (1986)
Record Number: 1989125026100 / Last updated on: 1987-03-01
Available languages: en