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A T-shaped antenna loaded with alumina was designed and constructed for lower hybrid wave heating of toroidal plasmas. The theoretical power spectra showed that a T-shaped antenna can be used for both ion and electron heating, and the accuracy of the calculation was verified by measuring the antenna's impedance. The dependence of the impedance on the power fed to the antenna was also investigated, and it was found that the R.F. pressure affected the coupling between the antenna and the plasma.
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Ohshima et al. (1981) studied this question.
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