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Vishwa Bandhu Pathak
초강력 레이저과학 연구단
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Spatial-temporal evolution of the current filamentation instability

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Title
Spatial-temporal evolution of the current filamentation instability
Author(s)
V B Pathak; Grismayer, T; Stockem, A; Fonseca, RA; Silva, LO
Publication Date
2015-04
Journal
NEW JOURNAL OF PHYSICS, v.17, no., pp.043049 -
Publisher
IOP PUBLISHING LTD
Abstract
The spatial-temporal evolution of the purely transverse current filamentation instability is analyzed by deriving a single partial differential equation for the instability and obtaining the analytical solutions for the spatially and temporally growing current filament mode. When the beam front always encounters fresh plasma, our analysis shows that the instability grows spatially from the beam front to the back up to a certain critical beam length; then the instability acquires a purely temporal growth. This critical beam length increases linearly with time and in the non-relativistic regime it is proportional to the beam velocity. In the relativistic regime the critical length is inversely proportional to the cube of the beam Lorentz factor gamma(0b). Thus, in the ultra-relativistic regime the instability immediately acquires a purely temporal growth all over the beam. The analytical results are in good agreement with multidimensional particle-in-cell simulations performed with OSIRIS. Relevance of the current study to recent and future experiments on fireball beams is also addressed
URI
http://pr.ibs.re.kr/handle/8788114/2072
DOI
10.1088/1367-2630/17/4/043049
ISSN
1367-2630
Appears in Collections:
Center for Relativistic Laser Science(초강력 레이저과학 연구단) > Journal Papers (저널논문)
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