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

Evans, Eugene S.; Cohen, Samuel A.; Welch, Dale R.

doi:10.1063/1.5022188

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

Journal Article · Thu Apr 05 00:00:00 EDT 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5022188· OSTI ID:1440976

^[1];

^[1]; Welch, Dale R. ^[2]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Voss Scientific, Albuquerque, NM (United States)

We report on 3D-3V particle-in-cell simulations of fast-ion energy-loss rates in a cold, weakly-magnetized, weakly-coupled plasma where the electron gyroradius, ρe, is comparable to or less than the Debye length, λ_De, and the fast-ion velocity exceeds the electron thermal velocity, a regime in which the electron response may be impeded. These simulations use explicit algorithms, spatially resolve ρ_e and λ_De, and temporally resolve the electron cyclotron and plasma frequencies. For mono-energetic dilute fast ions with isotropic velocity distributions, these scaling studies of the slowing-down time, τ_s, versus fast-ion charge are in agreement with unmagnetized slowing-down theory; with an applied magnetic field, no consistent anisotropy between τs in the cross-field and field-parallel directions could be resolved. Scaling the fast-ion charge is confirmed as a viable way to reduce the required computational time for each simulation. In conclusion, the implications of these slowing down processes are described for one magnetic-confinement fusion concept, the small, advanced-fuel, field-reversed configuration device.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1440976

Alternate ID(s):: OSTI ID: 1431387

Journal Information:: Physics of Plasmas, Vol. 25, Issue 4; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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