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

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...

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Bibliographic Details
Main Author: Roberts, Thomas Maximillian
Language:English
Published: 2015
Subjects:
Plasma (Ionized gases)
Physics
Online Access:https://doi.org/10.7916/D8GT5M4S
id ndltd-columbia.edu-oai-academiccommons.columbia.edu-10.7916-D8GT5M4S
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spelling ndltd-columbia.edu-oai-academiccommons.columbia.edu-10.7916-D8GT5M4S2019-05-09T15:14:46ZLocal Regulation of Interchange Turbulence in a Dipole-Confined Plasma Torus using Current-Injection FeedbackRoberts, Thomas Maximillian2015ThesesPlasma (Ionized gases)PhysicsTurbulence 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.Englishhttps://doi.org/10.7916/D8GT5M4S
collection NDLTD
language English
sources NDLTD
topic Plasma (Ionized gases)
Physics
spellingShingle Plasma (Ionized gases)
Physics
Roberts, Thomas Maximillian
Local Regulation of Interchange Turbulence in a Dipole-Confined Plasma Torus using Current-Injection Feedback
description 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.
author Roberts, Thomas Maximillian
author_facet Roberts, Thomas Maximillian
author_sort Roberts, Thomas Maximillian
title Local Regulation of Interchange Turbulence in a Dipole-Confined Plasma Torus using Current-Injection Feedback
title_short Local Regulation of Interchange Turbulence in a Dipole-Confined Plasma Torus using Current-Injection Feedback
title_full Local Regulation of Interchange Turbulence in a Dipole-Confined Plasma Torus using Current-Injection Feedback
title_fullStr Local Regulation of Interchange Turbulence in a Dipole-Confined Plasma Torus using Current-Injection Feedback
title_full_unstemmed Local Regulation of Interchange Turbulence in a Dipole-Confined Plasma Torus using Current-Injection Feedback
title_sort local regulation of interchange turbulence in a dipole-confined plasma torus using current-injection feedback
publishDate 2015
url https://doi.org/10.7916/D8GT5M4S
work_keys_str_mv AT robertsthomasmaximillian localregulationofinterchangeturbulenceinadipoleconfinedplasmatorususingcurrentinjectionfeedback
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