uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
NBI fast ion confinement in the helical core of MAST hybrid-like plasmas
Show others and affiliations
2014 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 54, no 6, 064020- p.Article in journal (Refereed) Published
Abstract [en]

Energetic ions are found to be transported strongly from the core of MAST hybrid-like plasmas during long-lived mode (LLM) magnetohydrodynamic activity. The resulting impact on the neutral beam ion deposition and concurrent current drive is modelled using the guiding-centre approximation in the internal kinked magnetic topology. General coordinate guiding-centre equations are extended for this purpose. It is found that the kinked core spirals around the position of strongest ionization, which remains geometrically centred, so that a large fraction of the population is deposited in the high shear external region where the plasma is almost axisymmetric. Those particles ionized in the low shear region exhibit exotic drift motion due to the strongly non-axisymmetric equilibrium, periodically passing near the magnetic axis and then reflected by the boundary of the kinked equilibrium, which in this respect acts as a confining pinch. Broad agreement is found against experimental measurement of fast ion particle confinement degradation as the MAST LLM amplitude varies.

Place, publisher, year, edition, pages
2014. Vol. 54, no 6, 064020- p.
Keyword [en]
hybrid scenario, internal kink mode, fast ion redistribution, current drive
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:uu:diva-228470DOI: 10.1088/0029-5515/54/6/064020ISI: 000336893100021OAI: oai:DiVA.org:uu-228470DiVA: diva2:734244
Available from: 2014-07-15 Created: 2014-07-15 Last updated: 2014-07-15Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Sangaroon, Siriyaporn
By organisation
Applied Nuclear Physics
In the same journal
Nuclear Fusion
Fusion, Plasma and Space Physics

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

Altmetric score

Total: 486 hits
ReferencesLink to record
Permanent link

Direct link