A hybrid particle method for the kinetic treatment of magnetized plasma sheaths
Tan, Xin Zhi
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https://hdl.handle.net/2142/116273
Description
Title
A hybrid particle method for the kinetic treatment of magnetized plasma sheaths
Author(s)
Tan, Xin Zhi
Issue Date
2022-07-20
Director of Research (if dissertation) or Advisor (if thesis)
Curreli, Davide
Committee Member(s)
Sankaran, R. Mohan
Department of Study
Nuclear, Plasma, & Rad Engr
Discipline
Nuclear, Plasma, Radiolgc Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
hPIC
Particle-in-cell method
Plasma sheaths
Guiding center model
Fully-kinetic model
Language
eng
Abstract
The guiding center approximation is commonly adopted in fusion particle codes to resolve the motion of charged particles in the core and at the plasma edge of a magnetic fusion device. However, the guiding center approximation does not hold in regions where the field gradients are large, such as the plasma sheath and presheath formed in front of a material surface. Here we present a new hybrid Lagrangian method, which converts the guiding center particles into finite-orbit particles once they reach a region close to the boundary, where the field gradients become large. The domain is divided into a guiding center region and a full-orbit region, and the conversion of the particle is performed both ways. We present numerical results from an implementation of this new scheme within the hPIC Particle-in-Cell developed at Illinois. We show that the approach can accurately resolve the full orbit physics of the plasma sheath, still allowing us to treat the vast majority of the plasma bulk with the usual guiding-center approximation.
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