Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session JP11: Poster Session IV: In-Person, Hall A (2:00-3:30pm) and Virtual Poster Presentations (3:45-5:00pm)
BEAMS: Laser Accelerators
Education, Public Engagement, and DEI
High School and Undergraduate Research
2:00 PM - 5:00 PM
Tuesday, October 18, 2022
Room: Exhibit Hall A and Online
Abstract: JP11.00147 : Investigating Magnetic Moment Conservation in Time and Spatially Varying Electromagnetic Fields
Presenter:
Stephan Jabs
(University of Texas at Austin)
Authors:
Stephan Jabs
(University of Texas at Austin)
Cole D Stephens
(University of Texas at Austin)
David R Hatch
(University of Texas at Austin)
varying external magnetic fields. Gyrokinetic models have less dimensions than fully kinetic
ones, and they have been used to efficiently model plasmas within fusion devices, guide field
reconnection, and solar wind turbulence [1] [2] [3]. One of the most fundamental assumptions of
gyrokinetics is magnetic moment invariance, stemming from its adiabatic invariance in single
charged particle trajectories [4]. Work has been done to quantify the degree to which the
magnetic moment is not conserved in several basic electromagnetic field configurations [5]. We
expand on this by investigating moment invariance in more complicated field combinations such
as electromagnetic waves in the presence of a strong magnetic field; we employ both analytical
and numerical methods such as perturbation theory and Runge-Kutta Simulations. We also
propose alternative definitions for the magnetic moment that are calculated by considering
guiding center drifts; It has been shown that these alternative definitions are conserved to a
higher order in these new field combinations.
References
[1] K. Germaschewski, B. Allen, T. Dannert, M. Hrywniak, J. Donaghy, G. Merlo, S. Ethier,
E. D'Azevedo, F. Jenko, and A. Bhattacharjee, Phys. Plasmas 28, 062501 (2021)
[2] Pueschel M.J., Jenko F., Told D. and Buchner J., Phys. Plasmas 18, 112102 (2011)
[3] M. J. Pueschel, D. Told, P. W. Terry, F. Jenko, E. G. Zweibel, V. Zhdankin, and H.
Lesch., ApJS 213, 30 (2014)
[4] A. J. Brizard and T. S. Hahm, Rev. Mod. Phys. 79, 421 (2007)
[5] C. D. Stephens, R. W. Brzozowski III, and F. Jenko, Phys. Plasmas 24, 102517 (2017)
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