Abstract Details
Abstracts
Author: Andrew T. Powis
Requested Type: Poster
Submitted: 2019-02-22 09:15:54
Co-authors: J. A. Carlsson, I. D. Kaganovich, Y. Raitses & A. Smolyakov
Contact Info:
Princeton University
41 Olden St
Princeton, New Jersey 08544
USA
Abstract Text:
A rotating plasma spoke is shown to develop in two-dimensional full-sized kinetic simulations of a Penning discharge cross-section. Electron cross-field transport within the discharge is highly anomalous and correlates strongly with the spoke phase. Similarity between collisional and collisionless simulations demonstrates that ionization is not necessary for spoke formation. Parameter scans with discharge current I_d, applied magnetic field strength B and ion mass m_i show that spoke frequency scales with √(e E_r L_n / m_i), where E_r is the radial electric field, L_n is the gradient length scale and $e$ is the fundamental charge. This scaling suggests that the spoke may develop as a non-linear phase of the collisionless Simon-Hoh instability.
[1] Powis, A. T., Carlsson, J. A., Kaganovich, I. D., Raitses, Y., & Smolyakov, A. (2018). Scaling of Spoke Rotation Frequency within a Penning Discharge. Physics of Plasmas, 25(6), 072110.
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