Change search
ReferencesLink to record
Permanent link

Direct link
Redistribution of ICRH fast ions in the presence of fishbones and Alfvén eigenmodes
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics. KTH, School of Electrical Engineering (EES), Centres, Alfvén Laboratory Centre for Space and Fusion Plasma Physics.ORCID iD: 0000-0002-7142-7103
Show others and affiliations
2007 (English)In: 34th EPS Conference on Plasma Physics 2007, EPS 2007 - Europhysics Conference Abstracts, 2007, no 1, 607-610 p.Conference paper (Refereed)
Abstract [en]

A set of experiments on fast ion redistribution was carried out in recent JET campaigns, in which the new fast ion loss detectors were used for the first time [1]. This paper reports on the experiments carried out with low density plasmas and high ICRH power, a scenario that allow large populations of highly energetic fast ions to be built up and a variety of instabilities to be destabilized. Fast ion losses were successfully measured and it could be confirmed they were effectively associated to MHD activity. Losses occurred at considerably high energies (of the order of few MeV) and two types of fast ions were identified by the gamma-ray diagnostics [2]: fast protons with an energetic tail in excess of 4.5 MeV due to ICRH tuned to a fundamental H-resonance in the centre of the plasmas and D-ions accelerated with second harmonic heating whose energies exceeded 0.5 MeV. Three types of losses were identified, one associated with sawtooth crashes, one associated with TAE and high frequency fishbones and a third group that seems to correlate with tornado modes. When tornado modes became unstable, a significant increase in the number of losses was measured and a change in both the energy and pitch angle of the lost ions was observed. In addition, it was also observed that the number of losses increased significantly with the ICRH power.

Place, publisher, year, edition, pages
2007. no 1, 607-610 p.
Keyword [en]
Experiments, Plasma diagnostics, Plasmas, Tokamak devices, Tornadoes
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-154676ScopusID: 2-s2.0-84873802977ISBN: 978-162276334-4OAI: diva2:758503
34th European Physical Society Conference on Plasma Physics 2007, EPS 2007, 2 July 2007 through 6 July 2007, Warsaw, Poland

QC 20141027

Available from: 2014-10-27 Created: 2014-10-27 Last updated: 2014-10-27Bibliographically approved

Open Access in DiVA

No full text


Search in DiVA

By author/editor
Johnson, Thomas
By organisation
Fusion Plasma PhysicsAlfvén Laboratory Centre for Space and Fusion Plasma Physics
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 9 hits
ReferencesLink to record
Permanent link

Direct link