Beam–plasma dynamics in finite-length, collisionless inhomogeneous systems

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 techniques and kinetic equations, the study examines how inhomogeneity emerges from integrat...

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Bibliographic Details
Published in:Physics of plasmas 2024-10, Vol.31 (10)
Main Authors: Mishra, R., Moulick, R., Adhikari, S., Marholm, S., Eklund, A. J., Miloch, W. J.
Format: Article
Language:English
Subjects:
Acoustic resonance
Cold flow
Flow stability
Inhomogeneity
Inhomogeneous systems
Ion beams
Ion motion
Kinetic equations
Magnetohydrodynamic stability
Motion stability
Particle in cell technique
Plasma dynamics
Sound waves
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Summary: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 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.
ISSN:1070-664X
1089-7674
DOI:10.1063/5.0218386