Multi-channel vector generator system

Author

Cockerell, B.T.

Author_Institution

Microwave Eng. Designs Ltd., Newport, UK

fYear

1992

fDate

33718

Firstpage

42552

Lastpage

42555

Abstract

The system described provides accurate and continuous analogue control of the phases and amplitudes of HF and microwave signals in multichannel systems for plasma heating in the Joint European Torus (JET) nuclear fusion experiment. Two RF systems are employed: one at 25-55 MHz couples energy into the plasma via the ions in its core (Ion Cyclotron Resonance Heating), and the 3.7 GHz Lower Hybrid Current Drive (LHCD) couples energy into the cooler outer regions of the plasma in order to broaden the temperature-radius profile. The LHCD system comprises 24 klystrons each feeding 700 kW to a multiport grille antenna in the reactor vessel. A travelling wavefront is generated across the grille by accurate phase modulation of each klystron output. Amplitude control is also provided and the whole system operates in a pulsed mode

Keywords

antenna phased arrays; closed loop systems; fusion reactor instrumentation; klystrons; microwave antenna arrays; phase modulation; plasma radiofrequency heating; temperature distribution; 3.7 GHz; 700 kW; JET; Joint European Torus; LHCD; Lower Hybrid Current Drive; RF systems; amplitude control; klystrons; multichannel systems; multiport grille antenna; nuclear fusion experiment; phase modulation; plasma heating; pulsed mode; temperature-radius profile; travelling wavefront; vector generator system;

fLanguage

English

Publisher

iet

Conference_Titel

Active and Passive Components for Phased Array Systems, IEE Colloquium on

Conference_Location

London

Type

conf

Filename

168278