TRANSP modelling of experimentally measured fast particle redistribution and losses on MAST
2013 (English)Conference proceedings (editor) (Other academic)
MAST is a mid-size spherical tokamak with BT = 0.3-0.6 T and two NBI systems delivering up to 3.5 MW of super-Alfvénic deuterons and therefore suitable for understanding the dynamics of fast particles in ITER-relevant scenarios. It is well known that MHD instabilities can cause redistribution and/or losses of fast ions as observed in many tokamaks (such as NSTX, TFTR, DIII-D, JET, ASDEX, NSTX and MAST). In particular, on MAST, the effect of fast particle driven instabilities, such as fishbones and long-lived modes upon the total neutron yield measured by fission chamber (FC) and the neutron count rates measured by Neutron Camera (NC) has been observed . Fishbones are characterized by burst-like behaviour observed in magnetic and SXR diagnostics and by the sweeping of the mode frequency during a burst. The resonant interaction between the toroidal and poloidal motion of the fast ions in the plasma with the n = 1, m = 1 internal kink mode is the mechanism responsible for driving the fishbone instability .
Place, publisher, year, edition, pages
010 Publishers, 2013.
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:uu:diva-275193OAI: oai:DiVA.org:uu-275193DiVA: diva2:899182
40th EPS Conference on Plasma Physics, Espoo, Finland, 1-5 July, 2013