Bulletin of the American Physical Society
60th Annual Meeting of the APS Division of Plasma Physics
Volume 63, Number 11
Monday–Friday, November 5–9, 2018; Portland, Oregon
Session TP11: Poster Session VII: Basic Plasma Physics: Pure Electron Plasma, Strongly Coupled Plasmas, Self-Organization, Elementary Processes, Dusty Plasmas, Sheaths, Shocks, and Sources; Mini-conference on Nonlinear Waves and Processes in Space Plasmas - Posters; MHD and Stability, Transients (2), Runaway Electrons; NSTX-U; Spherical Tokamaks; Analytical and Computational Techniques; Diagnostics (9:30am-12:30pm)
Thursday, November 8, 2018
OCC
Room: Exhibit Hall A1&A
Abstract ID: BAPS.2018.DPP.TP11.56
Abstract: TP11.00056 : Excitation and Transport of solitons and Their effects on Ion Beam Neutralization*
Presenter:
Igor D Kaganovich
(Princeton Plasma Phys Lab)
Authors:
Chaohui Lan
(Institute of Fluid Physics, China Academy of Engineering Physics, Princeton Plasma Phys Lab)
Igor D Kaganovich
(Princeton Plasma Phys Lab)
The excitation and transportation of BGK mode electron acoustic (EA) solitons were first observed in two-dimensional particle-in-cell simulations of ion beam neutralization by electron injection. The EA solitons, which are excited by two-stream instability of trapped electrons, can reach more than tens of Debye length in longitudinal size and last more than ten microseconds. They periodically move back and forth in a pulsed ion beam, causing a circular movement of electron phase-space-density hole. The velocity of solitons is close to the thermal velocity of injected electron. The decreased electron density results in a local maximum in electric potential and the potential peak can be several times higher than that of other places without solitons. With the attenuation of solitons, the electrons captured by the pulsed ion beam gain energy from solitions and become totally thermalized. In the absence of additional electron supplement, some of hot electrons are escaped from the ion beam, leading to the increase of beam potential and the decline of neutralization degree.
*This work was supported by the US Department of Energy
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DPP.TP11.56
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