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V3FIT: a code for three-dimensional equilibrium reconstruction

机译:V3FIT:三维平衡重建的代码

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摘要

The V3FIT code for performing equilibrium reconstruction in three-dimensional plasmas is described. It is a modular code that has the potential to be coupled with a variety of equilibrium solvers to compute the externally measured response to an arbitrary internal state of the plasma. Singular-value decomposition is used to identify the dominant components of the plasma state that can be accurately determined by the reconstruction process and to guide the minimization of the x~2 variance-normalized mismatch between the measured and computed signals. Comparison of a tokamak plasma equilibrium computed by V3FIT and by the axisymmetric equilibrium reconstruction code EFIT is presented. V3FIT is used to reconstruct an axisymmetric DIII-D equilibrium using experimentally observed magnetic diagnostic signals. Three-dimensional reconstructions of stellarator plasma equilibria in the CTH device show the code behaves as expected in the presence of experimental noise, appropriately ignores near-singular directions in parameter space and robustly reconstructs equilibria starting from substantially different initial parameter values.
机译:描述了用于在三维等离子体中执行平衡重建的V3FIT代码。它是一种模块化代码,有可能与各种平衡求解器耦合,以计算对等离子体的任意内部状态的外部测量响应。奇异值分解用于识别可以通过重构过程准确确定的等离子体状态的主要成分,并指导最小化测量信号和计算信号之间的x〜2方差归一化失配。提出了通过V3FIT和轴对称平衡重建代码EFIT计算的托卡马克等离子体平衡的比较。 V3FIT用于使用实验观察到的磁诊断信号重建轴对称DIII-D平衡。 CTH设备中的恒星等离子体平衡的三维重建表明,该代码在存在实验噪声的情况下表现出预期的性能,适当忽略了参数空间中的近奇方向,并从实质上不同的初始参数值开始稳健地重建了平衡。

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