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29 March 2024
 
  » arxiv » 1704.0014

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Importance of resolving the spectral support of beam-plasma instabilities in simulations
Mohamad Shalaby ; Avery E. Broderick ; Philip Chang ; Christoph Pfrommer ; Astrid Lamberts ; Ewald Puchwein ;
Date 31 Mar 2017
AbstractMany astrophysical plasmas are prone to beam-plasma instabilities. For relativistic and dilute beams, the spectral support of the beam-plasma instabilities is narrow, i.e., the linearly unstable modes that grow with rates comparable to the maximum growth rate occupy a narrow range of wave numbers. This places stringent requirements on the box-sizes when simulating the evolution of the instabilities. We identify the implied lower limits on the box size imposed by the longitudinal beam plasma instability, finding typically that sizes many orders of magnitude larger than the resonant wavelength are required. Using particle-in-cell simulations, we show that the failure to sufficiently resolve the spectral support of the instability yields slower growth and lower levels of saturation, potentially leading to erroneous physical conclusion.
Source arXiv, 1704.0014
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