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Nonlinear MHD simulations with NIMROD.
Advanced gyrokinetic simulations using GYRO.
Resistive Wall Mode calculations using GATO.

Theory and Computational Sciences

The mission of the Theory group at General Atomics is:

  1. to perform fundamental theoretical research in the theory of fusion plasmas
  2. to provide theoretical support to the DIII-D National Fusion Facility
  3. to facilitate scientific discovery in fusion research through the application of advanced computer science techniques.

Fusion is potentially an inexhaustible energy source whose exploitation requires basic understanding of high-temperature plasmas. The development of a science-based predictive capability for fusion-relevant plasmas is a challenge central to fusion energy science, in which numerical modeling has played a vital role for more than four decades.

The program in Theory and Simulation of Fusion Plasmas at General Atomics supports the DOE's goals of advancing fundamental understanding of plasmas, resolving outstanding scientific issues and establishing reduced-cost paths to more attractive fusion energy systems, and advancing understanding and innovation in high-performance plasmas including burning plasmas.

The program in advanced computer science techniques supports the same goal through the application of a wide variety of technologies including Grid Computing, Parallel Computing, Advanced Collaborative Environments, Large-Scale Data Management, Scientific Visualization, and Tiled Display Walls.

Announcements

Weekly Highlights

  • June 26, 2009

A complete expression was obtained for the poloidal variation of the electrostatic potential in the banana regime for large aspect ratio flux surfaces using the method of matched asymptotic expansions. The result exhibits a finite discontinuity at the innermost point of a flux surface instead of a divergence as previously reported. Using this expression in combination with the solution of the linearized drift kinetic equation with a model collision operator, the part of the toroidal angular momentum flux due to the poloidal electric field is calculated. The result is larger than the one in existing works, which neglect the poloidal electric field, by the order of the square root of the aspect ratio.

Dave Schissel and Gheni Abla attended the 7th IAEA Technical Meeting on Control, Data Acquisition, and Remote Participation for Fusion Research in Aix En Provence, France, from Jun.15th through 19th. They gave oral presentations on “An Investigation of Secure Remote Instrument Control” and “Customizable scientific web-portal for DIII-D nuclear fusion experiment”, respectively.

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