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Abstract

Two identical antennae delivering 3.5MW each for quasi-CW operation at 3.7 GHz are being installed on Tore Supra. Each antennae is composed of 16 evacuated modules using one H-plane hybrid junction (HJ) and 6 E-plane bijunctions as power dividers. Two modules of the same column are fed by a 500-kW klystron via an hybrid junction terminating the pressurised transmission line. The balance port of the HJ is connected to a load. The large number of waveguides -32 columns of 4 waveguides-with an internal periodic phasing of 90 allows a narrow, strongly assymmetric, N(parallel) spectrum to be excited for current drive studies. The N(parallel) peak value of the spectrum can be tailored by adjusting the power amplitude and phase of each klystron: when the phase between each module of the same line is varied from -90 to 90 , the N(parallel) peak value is shifted from 1.46 to 2.40. Two main issues are investigated: the power reflected towards the 8 klystrons feeding one antenna and the power launched into the plasma. The reflected power has to be low enough for operation with no circulators and the launched power has to be very directive (i.e. large ratio of the power in the main N(parallel) peak) for large current drive efficiency. For this purpose, the exact power division in amplitude and phase, which depends on the reflection due to the plasma, has to be known.

Additional information

Authors: GONICHE M, CEA Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR);BIBET P, CEA Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR);MOREAU D, CEA Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR);REY G, CEA Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR);TONON G, CEA Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Paper presented: 16th European Conference on Controlled Fusion and Plasma Physics, Venezia (IT), March 13-17, 1989
Availability: Available from (1) as Paper EN 34468 ORA
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