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In large tokamaks, such as JET, JT60 and Tore Supra, antennae made up of large phased arrays are used by the lower hybrid systems to couple the wave to plasma. By changing the phase between adjacent modules of the antennae, spectrum flexibility can be achieved, thus allowing the study of lower hybrid wave coupling to the plasma, and in particular current profile control. Phase profile at the grill aperture is a very important parameter and this paper describes the following four methods of measurement inspection: (i) the standard method, with the RF measurement; (ii) with microwave probes; (iii) by modulation of power reflection coefficients using phase variation; (iv) with 8 different phases by means of a scattering matrix.

Additional information

Authors: BERGER-BY G, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Paper presented: 17th Symposium on Fusion Technology, Roma (IT), September 14-18, 1992
Availability: Available from (1) as Paper EN 37065 ORA
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