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Title: What happens to full-f gyrokinetic transport and turbulence in a toroidal wedge simulation?

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 themore » peak |δΦ|, and (4) a frequency spectrum may not be used for the validity check of a wedge simulation.« less
Authors:
 [1] ; ORCiD logo [2] ; ORCiD logo [3] ; ORCiD logo [4] ;  [1]
  1. Korea Advanced Institute of Science and Technology (KAIST), Daejeon (South Korea)
  2. Korea Advanced Institute of Science and Technology (KAIST), Daejeon (South Korea); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Korea Advanced Institute of Science and Technology (KAIST), Daejeon (South Korea); Korea Institute of Nuclear Nonproliferation and Control, Daejeon (South Korea)
  4. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Report Number(s):
PPPL-5354
Journal ID: ISSN 1070-664X; TRN: US1700939
Grant/Contract Number:
AC02-09CH11466; AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 1; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Contributing Orgs:
Korea Adv Inst Sci & Technol, Dept Phys, Daejeon 34141, South Korea; Korea Inst Nucl Nonproliferat & Control, Daejeon 34054, South Korea
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; plasma
OSTI Identifier:
1349124
Alternate Identifier(s):
OSTI ID: 1361752