Effect of Faraday shields on capacitive coupling D
- Slides: 6
Effect of Faraday shields on capacitive coupling D. D. Blackwell and F. F. Chen, 2 D imaging of a helicon discharge, Plasma Sources Sci. Technol. 6, 569 (1997) No shield With shield
m = +1 mode much stronger than m = – 1 D. D. Blackwell and F. F. Chen, 2 D imaging of a helicon discharge, Plasma Sources Sci. Technol. 6, 569 (1997) m = – 1 m = +1
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
Time-resolved EEDFs show no fast electrons above 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 Loading resistance agrees with calculations w/o L. D. I-V at two RF phases Injecting a current causes a beam-plasma instability
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)
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.