Utilize este identificador para referenciar este registo: http://hdl.handle.net/10071/8159
Autoria: May, J.
Tonge, J. W.
Ellis, I.
Mori, W. B.
Fiuza, F.
Fonseca, R. A.
Silva, L. O.
Data: 2014
Título próprio: Enhanced stopping of macro-particles in particle-in-cell simulations
Volume: 21
Número: 5
Paginação: 052703
ISSN: 1070-664X
DOI (Digital Object Identifier): 10.1063/1.4875708
Resumo: We derive an equation for energy transfer from relativistic charged particles to a cold background plasma appropriate for finite-size particles that are used in particle-in-cell simulation codes. Expressions for one-, two-, and three-dimensional particles are presented, with special attention given to the two-dimensional case. This energy transfer is due to the electric field of the wake set up in the background plasma by the relativistic particle. The enhanced stopping is dependent on the q(2)/m, where q is the charge and m is the mass of the relativistic particle, and therefore simulation macro-particles with large charge but identical q/m will stop more rapidly. The stopping power also depends on the effective particle shape of the macro-particle. These conclusions are verified in particle-in-cell simulations. We present 2D simulations of test particles, relaxation of high-energy tails, and integrated fast ignition simulations showing that the enhanced drag on macro-particles may adversely affect the results of these simulations in a wide range of high-energy density plasma scenarios. We also describe a particle splitting algorithm which can potentially overcome this problem and show its effect in controlling the stopping of macro-particles.
Arbitragem científica: yes
Acesso: Acesso Aberto
Aparece nas coleções:CTI-RI - Artigos em revistas científicas internacionais com arbitragem científica

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