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The Impact of Faraday Shields on Capacitive Coupling in Helicon Discharges

This comprehensive study examines the effects of Faraday shields on capacitive coupling within helicon discharges. The research reveals that the presence of a Faraday shield leads to a significant enhancement in the m=+1 mode compared to the m=–1 mode, affecting the performance of plasma sources. In addition, it discusses the development of a time-resolved energy analyzer for electron energy distribution function (EEDF) measurements and illustrates the upper limits of Landau damping. Evidence of Trivelpiece-Gould modes is also presented, contributing valuable insights into plasma behavior under RF modulation.

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The Impact of Faraday Shields on Capacitive Coupling in Helicon Discharges

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  1. Effect of Faraday shields on capacitive coupling D.D. Blackwell and F.F. Chen, 2D imaging of a helicon discharge, Plasma Sources Sci. Technol.6, 569 (1997) No shield With shield

  2. m = +1 mode much stronger than m = –1 D.D. Blackwell and F.F. Chen, 2D imaging of a helicon discharge, Plasma Sources Sci. Technol.6, 569 (1997) m = –1 m = +1

  3. Development of a time-resolved energy analyzer D.D. Blackwell and F.F. Chen, Time-resolved measurements of the EEDF in a helicon plasma,Plasma Sources Sci. Technol. 10, 226 (2001) RF modulated electron gun for calibration 2-electrode gridded analyzer with RF response

  4. Time-resolved EEDFs show no fast electronsabove a threshold of 10 -4 F.F. Chen and D.D. Blackwell, Upper limit to Landau damping in helicon discharges, Phys. Rev. Lett.82, 2677 (1999) I-V swept by oscillating Vs I-V at two RF phases Loading resistance agrees with calculations w/o L.D. Injecting a current causes a beam-plasma instability

  5. Development of an RF J-dot probe D.D. Blackwell, T.G. Madziwa, D. Arnush, and F.F. Chen, Evidence for Trivelpiece-Gould modes in a helicon discharge,LTP-106 (June, 2001)

  6. Evidence for Trivelpiece-Gould modes D.D. Blackwell, T.G. Madziwa, D. Arnush, and F.F. Chen, Evidence for Trivelpiece-Gould modes in a helicon discharge,LTP-106 (June, 2001) "Wings" are seen in Jz but not in Bz. "Wings" are not predicted by theory if TG modes are neglected.

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