Evolution of the fastest-growing relativistic mixed mode instability driven by a tenuous plasma beam in one and two dimensions
2006 (English)In: Physics of Plasmas, ISSN 1070-664X, Vol. 13, no 11, 112110-1-112110-8 p.Article in journal (Refereed) Published
Particle-in-cell simulations confirm here that a mixed plasma mode is the fastest growing when a highly relativistic tenuous electron-proton beam interacts with an unmagnetized plasma. The mixed modes grow faster than the filamentation and two-stream modes in simulations with beam Lorentz factors Gamma of 4, 16, and 256, and are responsible for thermalizing the electrons. The mixed modes are followed to their saturation for the case of Gamma=4 and electron phase space holes are shown to form in the bulk plasma, while the electron beam becomes filamentary. The initial saturation is electrostatic in nature in the considered one- and two-dimensional geometries. Simulations performed with two different particle-in-cell simulation codes evidence that a finite grid instability couples energy into high-frequency electromagnetic waves, imposing simulation constraints.
Place, publisher, year, edition, pages
2006. Vol. 13, no 11, 112110-1-112110-8 p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-35835DOI: 10.1063/1.2390687Local ID: 28678OAI: oai:DiVA.org:liu-35835DiVA: diva2:256683