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Local Regulation of Interchange Turbulence in a Dipole-Confined Plasma Torus using Current-Injection Feedback

Thomas Maximillian Roberts

Title:
Local Regulation of Interchange Turbulence in a Dipole-Confined Plasma Torus using Current-Injection Feedback
Author(s):
Roberts, Thomas Maximillian
Thesis Advisor(s):
Mauel, Michael E.
Date:
Type:
Theses
Degree:
Ph.D., Columbia University
Department(s):
Applied Physics and Applied Mathematics
Persistent URL:
Abstract:
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.
Subject(s):
Plasma (Ionized gases)
Physics
Item views
358
Metadata:
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Suggested Citation:
Thomas Maximillian Roberts, , Local Regulation of Interchange Turbulence in a Dipole-Confined Plasma Torus using Current-Injection Feedback, Columbia University Academic Commons, .

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