Mitigation of Alfvén activity in a tokamak by externally applied static 3D fields

The application of static magnetic field perturbations to a tokamak plasma is observed to alter the dynamics of high-frequency bursting Alfvén modes that are driven unstable by energetic ions. In response to perturbations with an amplitude of δB/B∼0.01 at the plasma boundary, the mode amplitude is r...

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Published in:Physical review letters 2013-06, Vol.110 (26), p.265008-265008, Article 265008
Main Authors: Bortolon, A, Heidbrink, W W, Kramer, G J, Park, J-K, Fredrickson, E D, Lore, J D, Podestà, M
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cited_by cdi_FETCH-LOGICAL-c505t-49a89820a8aba5ef07773a498a54e439b2c39b6e6e2f9e70b4b9162b6efc36713
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container_end_page 265008
container_issue 26
container_start_page 265008
container_title Physical review letters
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creator Bortolon, A
Heidbrink, W W
Kramer, G J
Park, J-K
Fredrickson, E D
Lore, J D
Podestà, M
description The application of static magnetic field perturbations to a tokamak plasma is observed to alter the dynamics of high-frequency bursting Alfvén modes that are driven unstable by energetic ions. In response to perturbations with an amplitude of δB/B∼0.01 at the plasma boundary, the mode amplitude is reduced, the bursting frequency is increased, and the frequency chirp is smaller. For modes of weaker bursting character, the magnetic perturbation induces a temporary transition to a saturated continuous mode. Calculations of the perturbed distribution function indicate that the 3D perturbation affects the orbits of fast ions that resonate with the bursting modes. The experimental evidence represents an important demonstration of the possibility of controlling fast-ion instabilities through "phase-space engineering" of the fast-ion distribution function, by means of externally applied perturbation fields.
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title Mitigation of Alfvén activity in a tokamak by externally applied static 3D fields
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