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Optimizing the confinement and transport of fast ions is an importantconsideration in the design of modern fusion reactors. For spherical tokamaksin particular, fast ions can significantly influence global plasma behaviorbecause their large drift orbits often sample both core and scrape-off-layer(SOL) plasma conditions. Their Larmor radii are also comparable to the SOLwidth, rendering the commonly chosen guiding center approximationsinappropriate. Accurately modeling the behavior of fast ions therefore requiresretaining a complete description of the fast ion orbit including its Larmormotion. Here, we introduce the Scrape-Off-Layer Fast Ion (SOLFI) code, which isa new and versatile full-orbit Monte Carlo particle tracer being developed tofollow fast ion orbits inside and outside the separatrix. We benchmark SOLFI ina simple straight mirror geometry and show that the code (i) conserves particleenergy and magnetic moment, (ii) obtains the correct passing boundary forparticles moving in magnetic mirror field with an imposed electrostatic field,and (iii) correctly observes equal ion and electron current at the ambipolarpotential predicted from analytical theory.

Benchmarking the Scrape-Off-Layer Fast Ion (SOLFI) particle tracer code in a collisionless magnetic mirror with electrostatic potential drop