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We present various techniques that make orbit-following Monte Carlosimulations faster and more reliable when assessing collisionless fast particlelosses due to magnetic field perturbations. These techniques are based onidentifying various loss channels in constants of motion space using theso-called loss maps. We demonstrate that this allows one to attribute lossesquantitatively to different transport mechanisms, increase signal-to-noiseratio when estimating FILD signal and peak power loads, and connect magneticfield structure directly to fast particle losses. Furthermore, we show thatcollisionless fast particle transport can be treated as an advection-diffusionprocess where the transport coefficients can be evaluated with theorbit-following method. Applying these techniques has the potential to makeorbit-following simulations faster to perform, or to avoid them completely,while making the results more reliable as they become more clearly connected tounderlying physics. We demonstrate these techniques for ITER by showing howalpha particle losses are affected by various magnetic field perturbations,estimating ICRH losses in reduced field scenarios, and performing a scan onalpha particle losses as a function of ELM control coil current phases.

Efficient and robust evaluation of fast particle losses in non-axisymmetric tokamak plasmas