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Author(s):
K. Ohkubo and K. Matsumoto
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Title:
Coupling to the Lower Hybrid Waves with the Multijunction Grill
Date of publication:
May 1992
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Key words:
multijunction grill, RF coupling, lower hybrid wave, scattering matrix, multiple reflection
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Abstract:
Coupling characteristics of the multijunction grill have been studied theoretically and experimentally by using a multireflection method with the aid of scattering matrices not only at the junction plane but also at the grill mouth. The global reflection coefficients in the primary waveguide and secondary wave-guides can be estimated from the vector sum of reflecting components caused by each reflection between two scattering planes. The experimental results of scattering matrices and the global coupling agree well with calculated ones. It is shown that the multiple reflection in secondary waveguides of the four-junction grill for JIPPT-IIU tokomak is finished until three or four reflections. The length of the secondary waveguides is confirmed to be one of parameters determining the grill efficiency.
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