Quantitative study of the trapped particle bunching instability in Langmuir waves

Journal Article · Sun Feb 15 04:00:00 EST 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4906884· OSTI ID:22408057

Hara, Kentaro; Boyd, Iain D. ^[1]; Chapman, Thomas; Joseph, Ilon; Berger, Richard L. ^[2]; Banks, Jeffrey W. ^[3]; Brunner, Stephan ^[4]

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1. Department of Aerospace Engineering, University of Michigan, Ann Arbor, Michigan 48109 (United States)
2. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
3. Department of Mathematical Sciences, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)
4. Centre de Recherches en Physique des Plasmas, Association Euratom-Confederation Suisse, Ecole Polytechnique Fédérale de Lausanne, CRPP-PPB, CH-1015 Lausanne (Switzerland)

The bunching instability of particles trapped in Langmuir waves is studied using Vlasov simulations. A measure of particle bunching is defined and used to extract the growth rate from numerical simulations, which are compared with theory [Dodin et al., Phys. Rev. Lett. 110, 215006 (2013)]. In addition, the general theory of trapped particle instability in 1D is revisited and a more accurate description of the dispersion relation is obtained. Excellent agreement between numerical and theoretical predictions of growth rates of the bunching instability is shown over a range of parameters.

• OSTI ID: 22408057
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 2 Vol. 22; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
COMPUTERIZED SIMULATION
DISPERSION RELATIONS
LANGMUIR FREQUENCY
ONE-DIMENSIONAL CALCULATIONS
TRAPPED-PARTICLE INSTABILITY