Modelling the Dynamics of Energetic Ions and MHD Modes Influenced by ICRH
2016 (English)Report (Other academic)
FOXTAIL is a code used to describe the nonlinear interactions between toroidal Alfvén eigenmodes and an ensemble of resonant energetic particles in tokamaks with realistic geometries. This report introduces an extension of the code, including effects from ion cyclotron resonance heating (ICRH) of energetic ions using a quasilinear diffusion operator in adiabatic invariant space. First results of the effects of ICRH diffusion on the system consisting of a single Alfvén eigenmode linearly excited by resonant ions are presented. It is shown that the presence of ICRH diffusion allows for the mode amplitude to grow larger than in the case of nonlinear saturation in the absence of sources and sinks. Gradually increasing the strength of ICRH diffusion also decreases the linear growth rate of the mode. Both these phenomena are previously observed also for the case of a finite phase decorrelation operator in bump-on-tail systems with a single eigenmode.
Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2016.
TRITA-EE, ISSN 1653-5146 ; 2016:142
Monte Carlo model, wave-particle interactions, bump-on-tail instabilities, nonlinear dynamics, toroidal Alfvén eigenmodes, ion cyclotron resonance heating
Fusion, Plasma and Space Physics
Research subject Physics
IdentifiersURN: urn:nbn:se:kth:diva-192924OAI: oai:DiVA.org:kth-192924DiVA: diva2:973833
FunderSwedish Research Council, 621-2011-5387
QC 201609272016-09-222016-09-222016-09-27Bibliographically approved