Integrated Modeling of Tokamak Experiments with OMFIT

Meneghini, O.; Lao, L. L.

doi:10.1585/pfr.8.2403009

Cited by 54 publications

(40 citation statements)

References 21 publications

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“…The author is grateful for the fruitful reviewers’ comments. All simulations reported here have been obtained on a laptop using Python scripts via the OMFIT framework (see Meneghini & Lao 2013; Meneghini et al. 2015).…”

Section: Acknowledgementsmentioning

confidence: 99%

Generalized fluid theory including non-Maxwellian kinetic effects

Izacard

2017

J. Plasma Phys.

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The results obtained by the plasma physics community for the validation and the prediction of turbulence and transport in magnetized plasma come mainly from the use of very CPU-consuming particle-in-cell or (gyro)kinetic codes which naturally include non-Maxwellian kinetic effects. To date, fluid codes are not considered to be relevant for the description of these kinetic effects. Here, after revisiting the limitations of the current fluid theory developed in the 19th century, we generalize the fluid theory including kinetic effects such as non-Maxwellian super-thermal tails with as few fluid equations as possible. The collisionless and collisional fluid closures from the nonlinear Landau Fokker-Planck collision operator are shown for an arbitrary collisionality. Indeed, the first fluid models associated with two examples of collisionless fluid closures are obtained by assuming an analytic non-Maxwellian distribution function (e.g., the INMDF [O. Izacard, Phys. Plasmas 23, 082504 (2016) Kinetic corrections from analytic non-Maxwellian distribution functions in magnetized plasmas]). One of the main differences with the literature is our analytic representation of the distribution function in the velocity phase space with as few hidden variables as possible thanks to the use of non-orthogonal basis sets. These new non-Maxwellian fluid equations could initiate the next generation of fluid codes including kinetic effects and can be expanded to other scientific disciplines such as astrophysics, condensed matter, or hydrodynamics. As a validation test, we perform a numerical simulation based on a minimal reduced INMDF fluid model. The result of this test is the discovery of the origin of particle and heat diffusion. The diffusion is due to the competition between a growing INMDF on short time scales due to spatial gradients and the thermalization on longer time scales. The results shown here could draw the breaking of some unsolved understandings of the turbulence.

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Section: Acknowledgementsmentioning

confidence: 99%

Generalized fluid theory including non-Maxwellian kinetic effects

Izacard

2017

J. Plasma Phys.

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“…In addition to the developer tools readily available, the large scientific computing user base puts INGRID in a good position for extensive use within the edge-plasma modeling community and continued development. Python is a choice of object-oriented programming language that is being increasingly utilized in major tokamak plasma modeling projects such as OMFIT 15,16 and PyUEDGE 17 . This makes Python a natural and consistent choice to carry out software development needs.…”

Section: Software Design and User Interaction A Choice Of Development...mentioning

confidence: 99%

INGRID: an interactive grid generator for 2D edge plasma modeling

Garcia,

Umansky,

Watkins

et al. 2021

Preprint

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A new grid generator for tokamak boundary plasma INGRID (Interactive Grid Generator) is a Python-based code for calculating grids for boundary plasma modeling, for variety of configurations with one or two X-points in the domain. Based on a given geometry of the magnetic field, INGRID first calculates a skeleton grid which consists of a small number of quadrilateral patches, then it puts a subgrid on each of the patches, and joins them in a global grid. This "divide and conquer" strategy allows treating in a uniform way a variety of configurations with one or two X-points in the domain. This includes single-null, double-null, and variety of configurations topologically equivalent to snowflake-plus or snowflake-minus configurations. INGRID design allows generating grids either interactively via a parameter-file driven GUI, or using a non-interactive script-controlled workflow. Results of testing demonstrate that INGRID is a flexible, robust, and user-friendly grid generation tool for tokamak boundary plasma modeling.

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“…Globally the graphical user interface can be enhanced allowing multiple choices for the user. (ii) Another improvement under development is the inclusion of Gingred in a grid generator module of the python integrated modeling framework OMFIT [22,23] that allows interactions between multiple codes. All figures shown here are obtained with python scripts in OMFIT.…”

Section: Future Extensions Of Gingredmentioning

confidence: 99%

“…The name Gingred has been chosen by inverting the letters "i" and "e" from the common "GenGrid" or "GridGen" names. The execution of Gingred from the integrated framework OMFIT [22,23] is in progress. The work on Gingred was initiated in 2012 to simplify and create an interactive grid generator for the construction of snowflake grids for UEDGE simulations [24,25].…”

Section: Introductionmentioning

confidence: 99%

Gingred, a general grid generator for 2D edge plasma modeling

Izacard¹,

Umansky²

2017

Preprint

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The current work reports the development of a new general grid generator called Gingred for arbitrary (e.g., number of X-points) 2D magnetic equilibria and plate geometries. A standardization of the construction of a grid is explained, the main command lines are detailed, and examples of snowflake grids are shown. The main advantages of Gingred are the tracking of the step-by-step progresses (from "skeleton" grids) of grid generations by nonexperts and new users, the ability to use an arbitrary magnetic configuration, and the more accurate numerical computation by bi-cubic interpolation of the magnetic flux rather than discrete cosine transform.

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Integrated Modeling of Tokamak Experiments with OMFIT

Cited by 54 publications

References 21 publications

Generalized fluid theory including non-Maxwellian kinetic effects

Generalized fluid theory including non-Maxwellian kinetic effects

INGRID: an interactive grid generator for 2D edge plasma modeling

Gingred, a general grid generator for 2D edge plasma modeling

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