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Article overview
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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 | Abstract: | Many 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 | Services: | Forum | Review | PDF | Favorites |
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