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A new sawtooth control mechanism relying on toroidally propagating ion cyclotron resonance frequency waves: Theory and Joint European Torus tokamak experimental evidence
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0002-7142-7103
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2010 (English)In: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 17, no 5, 056118- p.Article in journal (Refereed) Published
Abstract [en]

The sawtooth control mechanism in plasmas employing toroidally propagating ion cyclotron resonance waves is extended. The asymmetrically distributed energetic passing ions are shown to modify the ideal internal kink mode when the position of the minority ion cyclotron resonance resides within a narrow region close to the q=1 surface. An analytical treatment of the internal kink mode in the presence of model distribution function with parallel velocity asymmetry is developed. The fast ion mechanism explains the strong sensitivity of sawteeth to resonance position, and moreover is consistent with dedicated Joint European Torus [F. Romanelli, Nucl. Fusion 49, 104006 (2009)] experiments which controlled sawteeth despite negligible current drive. [doi:10.1063/1.3363201]

Place, publisher, year, edition, pages
2010. Vol. 17, no 5, 056118- p.
Keyword [en]
kink instability, plasma radiofrequency heating, plasma toroidal confinement, sawtooth instability, Tokamak devices
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-25563DOI: 10.1063/1.3363201ISI: 000278182900111Scopus ID: 2-s2.0-77953019188OAI: oai:DiVA.org:kth-25563DiVA: diva2:370943
Conference
51st Annual Meeting of the Division-of-Plasma-Physics of the American-Physics-Society Atlanta, GA, NOV 02-06, 2009
Note
QC 20110214Available from: 2010-11-18 Created: 2010-10-27 Last updated: 2017-12-12Bibliographically approved

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Johnson, Thomas J.

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