Partial cancellation of drift kinetic effects between thermal and energetic particles on the resistive wall mode stabilization

Partial cancellation of drift kinetic effects between thermal and energetic particles on the resistive wall mode stabilization

Partial cancellation of drift kinetic effects between thermal and energetic particles on the resistive wall mode stabilization 150 150 UKAEA Opendata
CCFE-PR(15)91

Partial cancellation of drift kinetic effects between thermal and energetic particles on the resistive wall mode stabilization

Drift kinetic stabilization of the resistive wall mode (RWM) is computationally investigated using the MHD-kinetic hybrid code MARS-K, following the non-perturbative approach [Liu et al., Phys. Plasmas 15, 112503 (2008)], for both reversed field pinch (RFP) and tokamak plasmas. Various kinetic resonances between the mode and the guiding center drift motions of thermal particles - toroidal precession of trapped thermal ions and electrons, bounce motion of trapped thermal ions, transit motion of passing thermal ions – are included into the MARS-K modelling. In addition, toroidal precessional drift resonance effects from trapped energetic ions (EIs), with various equilibrium distribution models, are also included into the self-consistent toroidal computations. The results show partial cancellation of the drift kinetic damping on the RWM between the thermal particles and EIs contributions, in both RFP and tokamak plasmas. The degree of cancellation generally depends on the EIs equilibrium distribution, the particle birth energy, as well as the toroidal flow speed of the plasma.

Collection:
Journals
Journal:
Nuclear Fusion
Publisher:
IOP
Published date:
06/01/2016