Three-dimensional modeling of the sawtooth instability in a small tokamaka)
Three-dimensional modeling of the sawtooth instability in a small tokamaka)
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DOI：
10.1063/1.2695868
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发表时间：
2007-04
影响因子：
2.2
通讯作者：
J. Breslau;S. Jardin;W. Park
中科院分区：
文献类型：
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作者：
J. Breslau;S. Jardin;W. Park
锯齿不稳定性是感应托卡马克放电最基本的动力学之一，例如 ITER [R.艾马尔等人，等离子体物理学。受控聚变 44, 519 (2002)]。锯齿行为很复杂，并且仍未完全解释。扩展 MHD 建模中心 (CEMM) SciDAC 项目开展了一项雄心勃勃的活动，旨在使用扩展 MHD 模型尽可能准确地模拟小型托卡马克中的周期性运动。两者均是 M3D [W.帕克等人，物理学。 Plasmas 6, 1796 (1999)] 和 NIMROD [C. R. Sovinec 等人，物理学。 Plasmas 10, 1727 (2003)]已应用于该问题。初步的非线性 MHD 结果显示锯齿碰撞后磁场具有明显的随机性，但尚未完全收敛。与 MHD 模型相比，扩展 MHD 可以预测碰撞后的等离子体旋转、更快的重新连接以及降低的场线随机性。与重新连接层和生长时间相关的多个时间和空间尺度使得这成为一个极端......
The sawtooth instability is one of the most fundamental dynamics of an inductive tokamak discharge such as will occur in ITER [R. Aymar et al., Plasma Phys. Controlled Fusion 44, 519 (2002)]. Sawtooth behavior is complex and remains incompletely explained. The Center for Extended MHD Modeling (CEMM) SciDAC project has undertaken an ambitious campaign to model this periodic motion in a small tokamak as accurately as possible using the extended MHD model. Both M3D [W. Park et al., Phys. Plasmas 6, 1796 (1999)] and NIMROD [C. R. Sovinec et al., Phys. Plasmas 10, 1727 (2003)] have been applied to this problem. Preliminary nonlinear MHD results show pronounced stochasticity in the magnetic field following the sawtooth crash but are not yet fully converged. Compared to the MHD model, extended MHD predicts plasma rotation, faster reconnection, and reduced field line stochasticity in the crash aftermath. The multiple time and space scales associated with the reconnection layer and growth time make this an extreme...