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Methods for nonlinear simulation of tokamak plasma with realistic fast ion distribution function

Bierwage, A.; Shinohara, Koji

The distribution function of fast ions is determined by plasma geometry, sources, collisions and waves-particle interactions. A general framework for simulating the evolution of fast ions and bulk plasma subject to the above processes is presented. Exploiting the separation of time scales, the problem is tackled using specialized simulation codes and interfaces. An equilibrium solver reconstructs a JT-60U plasma equilibrium. An orbit-following Monte Carlo code computes a distribution function for the fast ions. Using an orbit-based marker loading technique, the distribution function is mapped into the constant-of-motion space. This gives a realistic distribution function that contains information about the fast ion sources and experimental setup. It is also an exact equilibrium, as required for the initialization of instability codes. The method will be used to simulate fast ion driven modes and to construct self-consistent equilibria that take into account the presence of fast ions.

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