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Observation and explanation of the JET n=0 chirping mode
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0002-7142-7103
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2006 (English)In: Physics Letters A, ISSN 0375-9601, Vol. 358, no 2, 154-158 p.Article in journal (Refereed) Published
Abstract [en]

Persistent rapid up and down frequency chirping modes with a toroidal mode number of zero (n = 0) have been observed in the JET tokamak when energetic ions, with a mean energy similar to 500 keV, were created by high field side ion cyclotron resonance frequency heating. This heating method enables the formation of an energetically inverted ion distribution function that allows ions to spontaneously excite the observed instability, identified as a global geodesic acoustic mode. The interpretation is that phase space structures form and interact with the fluid zonal flow to produce the pronounced frequency chirping.

Place, publisher, year, edition, pages
2006. Vol. 358, no 2, 154-158 p.
Keyword [en]
geodesic acoustic mode, phase-space structures, zonal flows, plasmas, tokamak
URN: urn:nbn:se:kth:diva-16019DOI: 10.1016/j.physleta.2006.05.030ISI: 000240874200012ScopusID: 2-s2.0-33746987054OAI: diva2:334061
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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Johnson, Thomas J.
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