Evidence of new finite beam plasma instability for magnetic field generation

We demonstrate by computer simulations, laser plasma experiments, and analytic theory that a hitherto unknown instability is excited in the beam plasma system with finite transverse size. This instability is responsible for the generation of magnetic fields at scales comparable to the transverse bea...

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Bibliographic Details
Published in:arXiv.org 2017-12
Main Authors: Das, Amita, Kumar, Atul, Shukla, Chandrasekhar, Bera, Ratan Kumar, Verma, Deepa, Patel, Bhavesh, Hayashi, Y, Tanaka, K A, Lad, Amit D, Kumar, G R, Kaw, Predhiman
Format: Article
Language:English
Subjects:
Beams (radiation)
Computer simulation
Laser plasmas
Magnetic fields
Magnetohydrodynamic stability
Stability analysis
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Summary:We demonstrate by computer simulations, laser plasma experiments, and analytic theory that a hitherto unknown instability is excited in the beam plasma system with finite transverse size. This instability is responsible for the generation of magnetic fields at scales comparable to the transverse beam dimension which can be much longer than the electron skin depth scale. This counterintuitive result arises due to radiative leakage associated with finite beam boundaries which are absent in conventional infinite periodic systems considered in earlier simulations as well as theoretical analyses and may trigger a reexamination of a hitherto prevalent idea.
ISSN:2331-8422