A plasma production experiment was performed using a microwave concave lens. A large-wave-number electron cyclotron wave is excited efficiently with the lens, and exhibits fast damping. For 5 kW input power, in low-pressure operation, the electron temperature is 70% higher than that without the lens, while in high-pressure operation, the electron density is 40% higher than that without the lens.
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Sugimoto et al. (1996) studied this question.
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