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Hur, Min Sup
Computational Plasma Lab
Research Interests
  • Laser-Plasma Electron Accelerator and Table-top Femto Hard X-ray generation

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Envelope-PIC Hybrid Method for the Simulation of Microwave Reflectometry

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Title
Envelope-PIC Hybrid Method for the Simulation of Microwave Reflectometry
Author
Kang, TeyounKwon, Kyu BeenCho, Myung-HoonKim, Young-KukHur, Min SupPark, Hyeon KeoLee, Woochang
Keywords
Envelope-particle-in-cell (PIC) hybrid simulation; microwave reflectometry; tokamak plasma diagnostics
Issue Date
201803
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation
IEEE TRANSACTIONS ON PLASMA SCIENCE, v.46, no.3, pp.577 - 582
Abstract
We developed a new hybrid method for the simulation of microwave reflectometry, which are commonly used to measure the plasma density and the density fluctuation in magnetically confined plasmas. For the simulation study of reflectometry, they usually solve a full wave equation assuming linear and steady-state response of the plasma. However, the dynamic properties of the plasma can be important near cutoff as the characteristic frequency of the plasma becomes comparable to that of the probe wave. In addition, highly nonlinear behavior is expected to emerge as the density fluctuation develops by numerous types of instability, which can be simulated self-consistently by the particle-in-cell (PIC) method. In our numerical scheme, the full PIC is employed to simulate the cutoff region, while the conventional steady-state dielectric model of the plasma is used for the low-density region. The advantage of the new method is the improved computational speed by at least threefold, while maintaining the overall accuracy of the PIC. The critical point of the new method is minimizing the numerical reflection in the heterogeneous domain.
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DOI
http://dx.doi.org/10.1109/TPS.2018.2799184
ISSN
0093-3813
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