Oblate electron holes are not attributable to anisotropic shielding
Name
2011.14941.pdf
Description
Submitted version
Size
2.37 MB
Format
Unknown
Checksum (MD5)
51091e091f0f3f119a17903e154825ca
Author(s)
Hutchinson, I.H.
Date Issued
2021
Journal
Physics of Plasmas
Publisher
AIP Publishing
Version
Original manuscript
Abstract
The influence of shielding mechanisms on the ratio of perpendicular to parallel scale lengths of multidimensional plasma electron hole equilibria is analyzed theoretically and computationally. It is shown that the "gyrokinetic"model, invoking perpendicular polarization, is based on a misunderstanding and cannot explain the observational trend that greater transverse extent accompanies a lower magnetic field. Instead, the potential in the wings of the hole, outside the region of trapped-electron depletion, has isotropic shielding giving φ ∝ e - r / L / r, with the shielding length L equal to the Debye length for holes much slower than the electron thermal speed. Particle in cell simulations confirm the analysis. Trapped electron charge distribution anisotropy must, therefore, instead underlie the oblate shape of electron holes.
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1063/5.0039233
