ITG–TEM turbulence simulation with bounce-averaged kinetic electrons in tokamak geometry
| Autor: | Jae-Min Kwon, Sumin Yi, T.S. Hahm, Lei Qi |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Tokamak Turbulence General Physics and Astronomy K-omega turbulence model Electron 01 natural sciences 010305 fluids & plasmas law.invention Computational physics Ion Physics::Plasma Physics Hardware and Architecture law Quantum mechanics 0103 physical sciences Turbulence kinetic energy Particle-in-cell 010306 general physics Adiabatic process |
| Zdroj: | Computer Physics Communications. 215:81-90 |
| ISSN: | 0010-4655 |
| DOI: | 10.1016/j.cpc.2017.02.009 |
| Popis: | We develop a novel numerical scheme to simulate electrostatic turbulence with kinetic electron responses in magnetically confined toroidal plasmas. Focusing on ion gyro-radius scale turbulences with slower frequencies than the time scales for electron parallel motions, we employ and adapt the bounce-averaged kinetic equation to model trapped electrons for nonlinear turbulence simulation with Coulomb collisions. Ions are modeled by employing the gyrokinetic equation. The newly developed scheme is implemented on a global δ f particle in cell code gKPSP. By performing linear and nonlinear simulations, it is demonstrated that the new scheme can reproduce key physical properties of Ion Temperature Gradient (ITG) and Trapped Electron Mode (TEM) instabilities, and resulting turbulent transport. The overall computational cost of kinetic electrons using this novel scheme is limited to 200%–300% of the cost for simulations with adiabatic electrons. Therefore the new scheme allows us to perform kinetic simulations with trapped electrons very efficiently in magnetized plasmas. |
| Databáze: | OpenAIRE |
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