Particle simulation of energetic particle driven Alfvén modes

Particle simulations of energetic particle driven Alfvén modes in JT-60U

Source Regulation of Fast Energetic Particle Driven Alfvén Modes Dynamics

OT 7 Particle Simulations of Alfvén Modes in Reversed-Shear DIII-D Discharges Heated by Neutral Beams∗

A rich spectrum of oscillations in the Alfvénic range has been observed in DIII-D tokamak reversedshear discharges heated by neutral beams. During the discharge phase characterized by Alfvénic activity, the energetic particle density profile, as calculated by a classical deposition model (TRANSP), appears to be much more peaked than that observed experimentally, as inferred, e.g., from the equi...

Hybrid magnetohydrodynamic-particle simulation of linear and nonlinear evolution of Alfvén modes in tokamaks

Linear and nonlinear properties of moderate-toroidal-number (n) shear-Alfvén modes in tokamaks are investigated by using a hybrid MHD-particle simulation code, which solves the coupled set of MHD ~magnetohydrodynamic! equations for the electromagnetic fields and gyrocenter Vlasov equation for a population of energetic ions. The existence of unstable toroidal Alfvén eigenmodes ~TAE’s! and their ...

TH/P6-4 Particle Simulation Analysis of Energetic-Particle and Alfvén-Mode Dy- namics in JT-60U Discharges

The results of particle simulations of a typical NNB-heated JT-60U discharge (# E036378), performed by the HMGC particle-in-cell code, are presented. We observe that the linear-growth phase is dominated by a fast-growing mode, localized at half radius, near the maximum of the energetic-ion pressure gradient and with a significant coupling with the Alfvén continuum, showing the energetic-particl...