Local Regulation of Interchange Turbulence in a Dipole-Confined Plasma Torus using Current-Injection Feedback
- Local Regulation of Interchange Turbulence in a Dipole-Confined Plasma Torus using Current-Injection Feedback
- Roberts, Thomas Maximillian
- Thesis Advisor(s):
- Mauel, Michael E.
- Ph.D., Columbia University
- Applied Physics and Applied Mathematics
- Persistent URL:
- Turbulence in plasma confined by a magnetic dipole is dominated by interchange fluctuations with complex dynamics and short spatial coherence. We report the first use of local current-collection feedback to modify, amplify, and suppress these fluctuations. The spatial extent of turbulence regulation is limited to a correlation length near the collector. Changing the gain and phase of collection results in power either extracted from or injected into the turbulence. This mechanism is analogous to the magnetospheric-ionospheric coupling by field-aligned currents. The measured plasma response shows some agreement with calculations of the linear response of global interchange-like MHD and entropy modes to current-collection feedback.
- Plasma (Ionized gases)
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- Suggested Citation:
- Thomas Maximillian Roberts, 2015, Local Regulation of Interchange Turbulence in a Dipole-Confined Plasma Torus using Current-Injection Feedback, Columbia University Academic Commons, https://doi.org/10.7916/D8GT5M4S.