BEAMS3D Neutral Beam Injection Model
Authors: Samuel Lazerson
Abstract: With the advent of applied 3D fi elds in Tokamaks and modern high
performance stellarators, a need has arisen to address non-axisymmetric effects on
neutral beam heating and fueling. We report on the development of a fully 3D neutral
beam injection (NBI) model, BEAMS3D, which addresses this need by coupling 3D
equilibria to a guiding center code capable of modeling neutral and charged particle
trajectories across the separatrix and into the plasma core. Ionization, neutralization,
charge-exchange, viscous velocity reduction, and pitch angle scattering are modeled
with the ADAS atomic physics database [1]. Benchmark calculations are presented to
validate the collisionless particle orbits, neutral beam injection model, frictional drag,
and pitch angle scattering effects. A calculation of neutral beam heating in the NCSX
device is performed, highlighting the capability of the code to handle 3D magnetic
fi elds.
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Submitted to: Plasma Physics and Controlled Fusion (April 2014)
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Download PPPL-5017 (pdf 274 KB 14 pp)
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