Abstract
Previous work, undertaken in the low heat flux environment of small experiments, has shown that insulating limiters made out of boron nitride can enhance the performance of rf antennas by mitigating the rf voltages available to drive plasma sheaths. In the present study, we develop a quantitative model of rf sheath mitigation and apply it to determine the rf electrical specifications that a material should meet to be suitable as an insulating rf limiter. Additional properties of a suitable material are discussed and compared with the properties of commonly available materials and with newly developed ceramic matrix composite materials. It is concluded that an rf limiter made from composite materials looks promising for use in sheath mitigation, especially for fast wave antennas.
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