On the density limit in the helicon plasma sources

  title={On the density limit in the helicon plasma sources},
  author={Igor A. Kotelnikov},
  journal={arXiv: Plasma Physics},
Existence of the density limit in the helicon plasma sources is critically revisited. The low- and high-frequency regimes of a helicon plasma source operation are distinguished. In the low-frequency regime with $\omega \sqrt{\omega_{ci}\omega_{ce}}$, an appropriate limit is given by the Shamrai-Taranov criterion. Both these criteria are closely related to the phenomenon of the coalescence of the helicon wave with the Trivelpiece-Gould mode. We argue that theoretical density limits are not… 

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