Boundary-induced effect on the spoke-like activity in E × B plasma

  title={Boundary-induced effect on the spoke-like activity in E × B plasma},
  author={E. Rodr{\'i}guez and V. Skoutnev and Y. Raitses and Andrew Tasman Powis and Igor D. Kaganovich and A. Smolyakov},
  journal={Physics of Plasmas},
The spoke instability in an E × B Penning discharge is shown to be strongly affected by the boundary that is perpendicular to B field lines. The instability is the strongest when bounded by dielectric walls. With a conducting wall, biased to collect electron current from the plasma, the spoke becomes faster, less coherent, and localized closer to the axis. The corresponding anomalous cross-field transport is assessed via simultaneous time-resolved measurements of plasma potential and density… 

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