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Free-boundary simulations of DIII-D plasmas with the NIMROD code

机译:使用NIMROD代码对DIII-D等离子体的自由边界模拟

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Modeling long-wavelength instabilities in modem tokamak discharges provides many numerical challenges due to the extreme temporal and spatial stiffness as the plasma becomes nearly collisionless. To meet these numerical challenges, the NIMROD code uses a high-order finite-element representation for the poloidal plane, and a pseudo-spectral method for the toroidal direction. The spectral convergence of the high-order elements is important for resolving anisotropic heat conduction at realistic parameters. Simulation results of a tokamak disruption which requires anisotropic heat conduction show that most of the heat flux is concentrated in the divertor region, but not where the initial strike points are located. (C) 2004 Elsevier B.V. All rights reserved.
机译:对现代托卡马克放电中的长波长不稳定性进行建模会带来许多数值方面的挑战,这是由于等离子体几乎变得无碰撞时具有极大的时间和空间刚度。为了应对这些数值挑战,NIMROD代码对极向平面使用了高阶有限元表示法,对环形方向采用了伪谱方法。高阶元素的光谱收敛对于解决实际参数下的各向异性热传导很重要。需要各向异性热传导的托卡马克破裂的模拟结果表明,大部分热通量集中在偏滤器区域,而不是初始冲击点所在的区域。 (C)2004 Elsevier B.V.保留所有权利。

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