What happens to full-f gyrokinetic transport and turbulence in a toroidal wedge simulation?
[2];
[3];
[4];
- Korea Advanced Institute of Science and Technology (KAIST), Daejeon (South Korea)
- Korea Advanced Institute of Science and Technology (KAIST), Daejeon (South Korea); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Korea Advanced Institute of Science and Technology (KAIST), Daejeon (South Korea); Korea Institute of Nuclear Nonproliferation and Control, Daejeon (South Korea)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Here, in order to save the computing time or to fit the simulation size into a limited computing hardware in a gyrokinetic turbulence simulation of a tokamak plasma, a toroidal wedge simulation may be utilized in which only a partial toroidal section is modeled with a periodic boundary condition in the toroidal direction. The most severe restriction in the wedge simulation is expected to be in the longest wavelength turbulence, i.e., ion temperature gradient (ITG) driven turbulence. The global full-f gyrokinetic code XGC1 is used to compare the transport and turbulence properties from a toroidal wedge simulation against the full torus simulation in an ITG unstable plasma in a model toroidal geometry. It is found that (1) the convergence study in the wedge number needs to be conducted all the way down to the full torus in order to avoid a false convergence, (2) a reasonably accurate simulation can be performed if the correct wedge number N can be identified, (3) the validity of a wedge simulation may be checked by performing a wave-number spectral analysis of the turbulence amplitude |δΦ| and assuring that the variation of δΦ between the discrete kθ values is less than 25% compared to the peak |δΦ|, and (4) a frequency spectrum may not be used for the validity check of a wedge simulation.
- Research Organization:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- Contributing Organization:
- Korea Adv Inst Sci & Technol, Dept Phys, Daejeon 34141, South Korea; Korea Inst Nucl Nonproliferat & Control, Daejeon 34054, South Korea
- Grant/Contract Number:
- AC02-09CH11466; AC02-05CH11231
- OSTI ID:
- 1349124
- Alternate ID(s):
- OSTI ID: 1361752
- Report Number(s):
- PPPL-5354; TRN: US1700939
- Journal Information:
- Physics of Plasmas, Vol. 24, Issue 1; ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Cross-verification of the global gyrokinetic codes GENE and XGC
|
journal | June 2018 |
Kinetic particle simulations in a global toroidal geometry
|
journal | August 2019 |
Bringing global gyrokinetic turbulence simulations to the transport timescale using a multiscale approach
|
journal | March 2018 |
| Bringing global gyrokinetic turbulence simulations to the transport timescale using a multiscale approach | text | January 2018 |
Similar Records
Full-f gyrokinetic particle simulation of centrally heated global ITG turbulence from magnetic axis to edge pedestal top in a realistic tokamak geometry
Full f gyrokinetic method for particle simulation of tokamak transport