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

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.
Authors:
ORCiD logo [1] ; ORCiD logo [1] ;  [2]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Voss Scientific, Albuquerque, NM (United States)
Publication Date:
Grant/Contract Number:
AC02-09CH11466
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 4; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1440976
Alternate Identifier(s):
OSTI ID: 1431387

Evans, Eugene S., Cohen, Samuel A., and Welch, Dale R.. Particle-in-cell studies of fast-ion slowing-down rates in cool tenuous magnetized plasma. United States: N. p., Web. doi:10.1063/1.5022188.
Evans, Eugene S., Cohen, Samuel A., & Welch, Dale R.. Particle-in-cell studies of fast-ion slowing-down rates in cool tenuous magnetized plasma. United States. doi:10.1063/1.5022188.
Evans, Eugene S., Cohen, Samuel A., and Welch, Dale R.. 2018. "Particle-in-cell studies of fast-ion slowing-down rates in cool tenuous magnetized plasma". United States. doi:10.1063/1.5022188.
@article{osti_1440976,
title = {Particle-in-cell studies of fast-ion slowing-down rates in cool tenuous magnetized plasma},
author = {Evans, Eugene S. and Cohen, Samuel A. and Welch, Dale R.},
abstractNote = {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, λDe, 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 ρe and λDe, 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, τs, 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.},
doi = {10.1063/1.5022188},
journal = {Physics of Plasmas},
number = 4,
volume = 25,
place = {United States},
year = {2018},
month = {4}
}