Local regulation of interchange turbulence in a dipole-confined plasma torus using current-collection feedback

Journal Article · Fri May 15 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4918352· OSTI ID:22410371

Worstell, M. W. ^[1]

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1. Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027 (United States)

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. 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.

• OSTI ID: 22410371
• Journal Information: Physics of Plasmas, Vol. 22, Issue 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CORRELATIONS
CURRENTS
ENTROPY
FLUCTUATIONS
MAGNETIC DIPOLES
MAGNETOHYDRODYNAMICS
PLASMA
PLASMA CONFINEMENT
TURBULENCE