A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Particle scattering in turbulent plasmas with amplified wave modes
Tekijät: Lange S, Spanier F, Battarbee M, Vainio R, Laitinen T
Kustantaja: EDP SCIENCES S A
Julkaisuvuosi: 2013
Journal: Astronomy and Astrophysics
Tietokannassa oleva lehden nimi: ASTRONOMY & ASTROPHYSICS
Lehden akronyymi: ASTRON ASTROPHYS
Artikkelin numero: UNSP A129
Vuosikerta: 553
Sivujen määrä: 15
ISSN: 0004-6361
DOI: https://doi.org/10.1051/0004-6361/201220804
Tiivistelmä
Our calculations show a good agreement of particle simulations and the QLT for broad-band turbulent spectra; for higher turbulence levels and particle beam driven plasmas, the QLT approximation gets worse. Especially the resonance gap at mu = 0 poses a well-known problem for QLT for steep turbulence spectra, whereas test-particle computations show no problems for the particles to scatter across this region. The reason is that the sharp resonant wave-particle interactions in QLT are an oversimplification of the broader resonances in test-particle calculations, which result from nonlinear effects not included in the QLT. We emphasise the importance of these results for both numerical simulations and analytical particle transport approaches, especially the validity of the QLT.
Our calculations show a good agreement of particle simulations and the QLT for broad-band turbulent spectra; for higher turbulence levels and particle beam driven plasmas, the QLT approximation gets worse. Especially the resonance gap at mu = 0 poses a well-known problem for QLT for steep turbulence spectra, whereas test-particle computations show no problems for the particles to scatter across this region. The reason is that the sharp resonant wave-particle interactions in QLT are an oversimplification of the broader resonances in test-particle calculations, which result from nonlinear effects not included in the QLT. We emphasise the importance of these results for both numerical simulations and analytical particle transport approaches, especially the validity of the QLT.
Ladattava julkaisu This is an electronic reprint of the original article. |  |
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