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This paper introduces the Scrape-Off-Layer Fast Ion (SOLFI) code, which is anew and versatile full-orbit Monte Carlo particle tracer developed to followfast ion orbits inside and outside the separatrix in tokamaks. SOLFI isbenchmarked in a simple straight mirror geometry, showing that the codeconserves particle energy and magnetic moment, obtains the correct passingboundary for particles moving in the magnetic mirror field with an imposedelectrostatic field, and correctly observes equal ion and electron current atthe ambipolar potential predicted from analytical theory. This result hasconsequences for collisionless scrape-off-layers in spherical tokamaks. We thenutilize SOLFI for fundamental physics studies in novel tokamak geometries,exploring the effect of shaping on the trapped particle fraction and bouncelocations in tokamaks and demonstrating that negative triangularity can be usedto maximize the fraction of particles bouncing in the good-curvature region,potentially leading to enhanced confinement.

Application of the Scrape-Off-Layer Fast Ion (SOLFI) code to assess particle motion in mirrors and tokamaks