ADDITIONAL HEATING POWER SUPPLIES - DESIGN CONCEPT AND FIRST OPERATION
Two additional heating methods for JET: Neutral Injection (NI) and Ion Cyclotron Resonance Heating (RF). In RF 10 generators each will deliver 3 MW; for NI 16 ion sources each will deliver 4.8MW ion beam. In order to minimize the internal dissipation in the RF generators under varying load conditions (plasma), the high voltage on the anode of the tetrode is varied. The requirements for the NI power supply are different. The accelerating grid power supply must be stable and able to switch off in 10 microsec (breakdown) and re-apply within 50 ms. Both functions are performed by a high power tetrode (protection system). In addition other power supplies (Aux PS) are necessary. They are the arc, filament, suppression grid, gradient grid, bending magnet power supplies. Because JET will operate with tritium later, all power supplies must be installed at a distance. A special cable (SF6 Transmission Line) links each protection system and the Aux power supplies for the ion source with this ion source. These transmission lines are not directly connected, they terminate at a pressurized vessel (SF6 Tower) which houses snubbers and the high voltage breaks for all services. This SF6 Tower contains passive components only, and can therefore be placed close to the injectors.
Bibliographic Reference: 11TH SYMPOSIUM ON FUSION ENGINEERING, AUSTIN, TEXAS (USA), NOV. 18-22, 1985 PP. 5-1 $- 5-6 WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON OX14 3EA (UK), MENTIONING REPORT JET-P(85)26, 1985
Record Number: 1989125071500 / Last updated on: 1987-12-01
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