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

被引：0

作者：

Tran, Aaron ^{[1
]}

Frank, Samuel J. ^{[2
]}

Le, Ari Y. ^{[3
]}

Stanier, Adam J. ^{[3
]}

Wetherton, Blake A. ^{[3
]}

Egedal, Jan ^{[1
]}

Endrizzi, Douglass A. ^{[2
]}

Harvey, Robert W. ^{[4
]}

Petrov, Yuri V. ^{[4
]}

Qian, Tony M. ^{[1
,5
]}

Sanwalka, Kunal ^{[1
]}

Viola, Jesse ^{[2
]}

Forest, Cary B. ^{[1
,2
]}

Zweibel, Ellen G. ^{[1
,6
]}

机构：

[1] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

[2] Realta Fus, Madison, WI USA

[3] Los Alamos Natl Lab, Los Alamos, NM USA

[4] CompX, Del Mar, CA USA

[5] Princeton Plasma Phys Lab, Princeton, NJ USA

[6] Univ Wisconsin, Dept Astron, Madison, WI USA

来源：

JOURNAL OF PLASMA PHYSICS | 2025年 / 91卷 / 03期

基金：

美国国家科学基金会;

关键词：

Plasma Simulation; Plasma Instabilities; Plasma Devices; HIGH-BETA; PLASMA; STABILIZATION; MODE; WAVES; TRAP; CONFINEMENT; DEPENDENCE; ANISOTROPY; HARMONICS;

D O I：

10.1017/S0022377825000480

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The kinetic stability of collisionless, sloshing beam-ion ( $45<^>\circ$ pitch angle) plasma is studied in a three-dimensional (3-D) simple magnetic mirror, mimicking the Wisconsin high-temperature superconductor axisymmetric mirror 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 fuelling. Over $1$ - $10\;\mathrm{\unicode{x03BC} s}$ , drift-cyclotron loss-cone (DCLC) modes grow and saturate in amplitude. The 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 the said well. Instead, cool ions must come from external sources such as charge-exchange collisions with a low-density neutral population. Manually adding cool $\mathord {\sim } 1\;\mathrm{keV}$ ions improves beam-ion confinement several-fold in Hybrid-VPIC simulations, which qualitatively corroborates prior measurements from real mirror devices with sloshing ions.

引用

页数：36

共 90 条

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