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Poster Session II

4:30 pm – 6:30 pm, Wednesday October 15 Session DW5 COEX, Lobby E
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Magnetic moment conservation and nonadiabatic behavior of electrons in axisymmetric inhomogeneous magnetic fields

Poster 18
Presenter: Lukas L Vogelhuber (Bochum University)
Authors: Kevin Köhn (Ruhr Univ Bochum), Liang Xu (Soochow University), Yulia Sharova (Ruhr University Bochum), Dennis Krüger (Ruhr Univ Bochum), Jens Kallähn (Ruhr Univ Bochum), Denis Eremin (Ruhr University Bochum), Ralf Peter Brinkmann (Ruhr University Bochum)

Partially magnetized plasma discharges in $E\times B$ configurations are versatile tools, with applications ranging from Hall-effect thrusters for space propulsion to high-power impulse magnetron sputtering (HiPIMS) for thin-film deposition. Their magnetic fields are typically described in cylindrical coordinates \((r,\theta,z)\), with field lines in the \(r\)–\(z\) plane [1]. Electrons confined in the race-track region are considered magnetized, with their magnetic moment serving as an indicator of the degree of confinement; if the magnetic moment is conserved along the trajectory, the electron remains magnetized. However, various processes can disrupt this conservation, including collisions, electric field interactions, and resonant particle motion [2,3].

If the magnetic moment of an electron is not conserved, a diffusion in velocity space can be associated with this nonadiabatic behavior [4]. This work investigates the dynamics of the electron magnetic moment $\mu$ in these configurations with an axisymmetric magnetic field, examining their nonadiabatic behavior and its impact on electron energization under such conditions.

[1] R. P. Brinkmann et al. 2020 Phys. Plasmas; 27 (5): 053504.

[2] R. J. Hastie et al. 1969 IAEA pp. p. 389–401

[3] C. D. Stephens et al. 2017 Phys. Plasmas; 24 (10): 102517.

[4] I. B. Bernstein Phys. Fluids 19, 1546–1550 (1976)

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