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Drift-cyclotron loss-cone instability in 3D simulations of a sloshing-ion simple mirror

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arxiv 2412.04656 v2 pith:SMZDXNVF submitted 2024-12-05 physics.plasm-ph

Aaron Tran , Samuel J. Frank , Ari Y. Le , Adam J. Stanier , Blake A. Wetherton , Jan Egedal , Douglass A. Endrizzi , Robert W. Harvey
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Yuri V. Petrov Tony M. Qian Kunal Sanwalka Jesse Viola Cary B. Forest Ellen G. Zweibel
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classification physics.plasm-ph
keywords ionsdclcmirrorsloshingbeam-ioncoolcodeconfinement
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abstract

The kinetic stability of collisionless, sloshing beam-ion (45{\deg} pitch angle) plasma is studied in a 3D simple magnetic mirror, mimicking the Wisconsin High-temperature superconductor Axisymmetric Mirror (WHAM) experiment. The collisional Fokker-Planck code CQL3D-m provides a slowing-down beam-ion distribution to initialize the kinetic-ion/fluid-electron code Hybrid-VPIC, which then simulates free plasma decay without external heating or fueling. Over 1-10 $\mu$s, drift-cyclotron loss-cone (DCLC) modes grow and saturate in amplitude. DCLC scatters ions to a marginally-stable distribution with gas-dynamic rather than classical-mirror confinement. Sloshing ions can trap cool (low-energy) ions in an electrostatic potential well to stabilize DCLC, but DCLC itself does not scatter sloshing beam-ions into said well. Instead, cool ions must come from external sources such as charge-exchange collisions with a low-density neutral population. Manually adding cool ~1 keV ions improves beam-ion confinement several-fold in Hybrid-VPIC simulations, which qualitatively corroborates prior measurements from real mirror devices with sloshing ions.

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  1. Ponderomotive barriers in rotating mirror devices using static fields

    physics.plasm-ph 2025-02 conditional novelty 5.0 of 10

    Static field corrugations in a rotating mirror plasma can generate species-selective ponderomotive barriers or wells without using radio-frequency power.

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