Beam-Plasma Dynamics in Finite-Length, Collisionless Inhomogeneous Systems
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arXiv
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| Format: | Preprint |
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2021
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| _version_ | 1866910434079014912 |
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| author | Mishra, R. Moulick, R. Adhikari, S. Marholm, S. Eklund, A. J. Miloch, W. J. |
| author_facet | Mishra, R. Moulick, R. Adhikari, S. Marholm, S. Eklund, A. J. Miloch, W. J. |
| contents | This study investigates the streaming instability triggered by ion motion in a plasma system that is finite in length, collisionless, and inhomogeneous. Employing numerical simulations using Particle-In-Cell (PIC) techniques and kinetic equations, the study examines how inhomogeneity emerges from integrating a cold ion beam with a background plasma within a confined system. The findings suggest that steady ion flow can modify ion sound waves through acoustic reflections from system boundaries, leading to instability. Such phenomena are known to be a hydrodynamic effect. However, there are also signatures of the beam-driven ion sound instability where kinetic resonances play a pivotal role. The main objective is to understand the impact of a finite-length system on beam-plasma instability and to identify the wave modes supported in such configurations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2109_01431 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Beam-Plasma Dynamics in Finite-Length, Collisionless Inhomogeneous Systems Mishra, R. Moulick, R. Adhikari, S. Marholm, S. Eklund, A. J. Miloch, W. J. Plasma Physics 76X05, 76E20, 85-10, 82D10 J.2; I.6.5; G.1.5; G.1.8 This study investigates the streaming instability triggered by ion motion in a plasma system that is finite in length, collisionless, and inhomogeneous. Employing numerical simulations using Particle-In-Cell (PIC) techniques and kinetic equations, the study examines how inhomogeneity emerges from integrating a cold ion beam with a background plasma within a confined system. The findings suggest that steady ion flow can modify ion sound waves through acoustic reflections from system boundaries, leading to instability. Such phenomena are known to be a hydrodynamic effect. However, there are also signatures of the beam-driven ion sound instability where kinetic resonances play a pivotal role. The main objective is to understand the impact of a finite-length system on beam-plasma instability and to identify the wave modes supported in such configurations. |
| title | Beam-Plasma Dynamics in Finite-Length, Collisionless Inhomogeneous Systems |
| topic | Plasma Physics 76X05, 76E20, 85-10, 82D10 J.2; I.6.5; G.1.5; G.1.8 |
| url | https://arxiv.org/abs/2109.01431 |