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We report on 3D-3V particle-in-cell simulations of fast-ion energy-loss ratesin cold, weakly-magnetized, weakly-coupled plasma where the electrongyroradius, $\rho_{e}$, is comparable to or less than the Debye length,$\lambda_{De}$, and the fast-ion velocity exceeds the electron thermalvelocity, a regime in which the electron response may be impeded. Thesesimulations use explicit algorithms, spatially resolve $\rho_{e}$ and$\lambda_{De}$, and temporally resolve the electron cyclotron and plasmafrequencies. For mono-energetic dilute fast ions with isotropic velocitydistributions, these scaling studies of the slowing-down time, $\tau_{s}$,\versus fast-ion charge are in agreement with unmagnetized slowing-down theory;with an applied magnetic field, no consistent anisotropy between $\tau_{s}$ inthe cross-field and field-parallel directions could be resolved. Scaling thefast-ion charge is confirmed as a viable way to reduce the requiredcomputational time for each simulation. The implications of these slowing downprocesses are described for one magnetic-confinement fusion concept, the small,advanced-fuel, field-reversed configuration device.

Particle-in-cell studies of fast-ion slowing-down rates in cool tenuous magnetized plasma