Verification of long wavelength electromagnetic modes with a gyrokinetic-fluid hybrid model in the XGC code

Hager, Robert; Lang, Jianying; Chang, C. S.; Ku, S.; Chen, Yang; Parker, Scott; Adams, Mark F.

doi:10.1063/1.4983320

Cited by 22 publications

(17 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although both GENE and XGC have been extensively and thoroughly benchmarked in various regimes (see, e.g., Refs. [9,[11][12][13][14][15][16][17][18]), there is not yet a direct comparison between these two codes. Moreover, previous benchmarks have used different sets of parameters, and thus even indirect comparisons are not possible.…”

Section: Introductionmentioning

confidence: 99%

Cross-verification of the global gyrokinetic codes GENE and XGC

et al. 2018

Self Cite

View full text Add to dashboard Cite

A detailed cross-verification between two global gyrokinetic codes, the core continuum code GENE and the edge particle-in-cell code XGC, for linear and nonlinear simulations of iontemperature-gradient modes is carried out. With recent developments in edge gyrokinetics, it may be feasible someday to describe the whole tokamak plasma on turbulence timescales using a coupled gyrokinetic simulation model. Before pursuing this, the core code (GENE) and the edge code (XGC) must be carefully benchmarked with each other. The present verification provides a solid basis for future code coupling research. Also included in the benchmarking is the global particle-in-cell code ORB5, to raise confidence in the quality of the obtained results. Excellent agreement between all three codes is obtained. Furthermore, in order to facilitate a benchmark framework for other codes, we make a specific effort to provide all relevant input parameters and precise details for each code.

show abstract

Section: Introductionmentioning

confidence: 99%

Cross-verification of the global gyrokinetic codes GENE and XGC

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…To this point, all published nonlinear electromagnetic gyrokinetic results have focused on the core region, mostly within the δf formulation neglecting the E nonlinearity, although the ORB5 PIC code includes the E nonlinearity and is effectively full-f (Lanti et al 2019). The XGC1 code is also full-f and is focused on both the core and the edge/SOL; it has an option for a gyrokinetic ion/drift-fluid massless electron hybrid model (Hager et al 2017), with a fully kinetic implicit electromagnetic scheme based on Chen & Chacon (2015) recently implemented and under further development (Ku et al 2018b). Other gyrokinetic codes working on the SOL are not yet electromagnetic.…”

mentioning

confidence: 99%

Electromagnetic full- gyrokinetics in the tokamak edge with discontinuous Galerkin methods

et al. 2020

View full text Add to dashboard Cite

We present an energy-conserving discontinuous Galerkin scheme for the fullf electromagnetic gyrokinetic system in the long-wavelength limit. We use the symplectic formulation and solve directly for ∂A /∂t, the inductive component of the parallel electric field, using a generalized Ohm's law derived directly from the gyrokinetic equation. Linear benchmarks are performed to verify the implementation and show that the scheme avoids the Ampère cancellation problem. We perform a nonlinear electromagnetic simulation in a helical open-field-line system as a rough model of the tokamak scrape-off layer using parameters from the National Spherical Torus Experiment (NSTX). This is the first published nonlinear electromagnetic gyrokinetic simulation on open field lines. Comparisons are made to a corresponding electrostatic simulation.

show abstract

“…* mathewsa@mit.edu This is significant since validating the accuracy of reduced turbulence theories is amongst the greatest challenges to the advancement of plasma modelling. In the fusion community, both comprehensive full-f global gyrokinetic [6][7][8][9][10][11][12][13] and two-fluid [14][15][16][17][18] direct numerical simulations are under active development to improve predictive modelling capabilities and the design of future reactors, but no single code can currently capture all the dynamics present in the edge with sufficient numerical realism. It is therefore of paramount importance to recognize when certain numerical or analytical simplifications make no discernible difference, or when a given theoretical assumption is too risky-to clearly identify the limits of present simulations [4].…”

Section: Introductionmentioning

confidence: 99%

Turbulent field fluctuations in gyrokinetic and fluid plasmas

Mathews,

Mandell,

Francisquez

et al. 2021

Preprint

View full text Add to dashboard Cite

A key uncertainty in the design and development of magnetic confinement fusion energy reactors is predicting edge plasma turbulence. An essential step in overcoming this uncertainty is the validation in accuracy of reduced turbulent transport models. Drift-reduced Braginskii two-fluid theory is one such set of reduced equations that has for decades simulated boundary plasmas in experiment, but significant questions exist regarding its predictive ability. To this end, using a novel physics-informed deep learning framework, we demonstrate the first ever direct quantitative comparisons of turbulent field fluctuations between electrostatic two-fluid theory and electromagnetic gyrokinetic modelling with good overall agreement found in magnetized helical plasmas at low normalized pressure. This framework is readily adaptable to experimental and astrophysical environments, and presents a new technique for the numerical validation and discovery of reduced global plasma turbulence models.

show abstract

Verification of long wavelength electromagnetic modes with a gyrokinetic-fluid hybrid model in the XGC code

Cited by 22 publications

References 36 publications

Cross-verification of the global gyrokinetic codes GENE and XGC

Cross-verification of the global gyrokinetic codes GENE and XGC

Electromagnetic full- gyrokinetics in the tokamak edge with discontinuous Galerkin methods

Turbulent field fluctuations in gyrokinetic and fluid plasmas

Contact Info

Product

Resources

About