Comparisons of linear and nonlinear plasma response models for non-axisymmetric perturbationsa)
Comparisons of linear and nonlinear plasma response models for non-axisymmetric perturbationsa)
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DOI：
10.1063/1.4805087
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发表时间：
2012-04
影响因子：
2.2
通讯作者：
A. Turnbull;N. Ferraro;V. Izzo;E. Lazarus;Jongkyu Park;W. A. Cooper;S. Hirshman;L. Lao;M. Lanct
中科院分区：
文献类型：
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作者：
A. Turnbull;N. Ferraro;V. Izzo;E. Lazarus;Jongkyu Park;W. A. Cooper;S. Hirshman;L. Lao;M. Lanct
随着在大型托卡马克装置上安装非轴对称线圈系统以研究无ELM运行的前景，了解等离子体对外加场的响应是一个至关重要的问题。应用不同的响应模型，使用标准的工具，DIII-D放电与施加的非轴对称领域从内部线圈，产生质的不同的结果。等离子体响应可以被处理为初始值问题，从初始未扰动状态或从附近的扰动平衡方法动态地跟踪系统，并使用线性和非线性模型[A. D. Turnbull，Nucl.Fusion 52，054016（2012）]。标准进行了讨论，每种方法可以产生一个有效的响应。在所研究的DIII-D情况下，这些判据表明线性理论的崩溃，尽管在这种情况下施加的磁场扰动的相对幅度很小，为10 − 3。对于非线性动力学演化模拟达到饱和非...
With the installation of non-axisymmetric coil systems on major tokamaks for the purpose of studying the prospects of ELM-free operation, understanding the plasma response to the applied fields is a crucial issue. Application of different response models, using standard tools, to DIII-D discharges with applied non-axisymmetric fields from internal coils, is shown to yield qualitatively different results. The plasma response can be treated as an initial value problem, following the system dynamically from an initial unperturbed state, or from a nearby perturbed equilibrium approach, and using both linear and nonlinear models [A. D. Turnbull, Nucl. Fusion 52, 054016 (2012)]. Criteria are discussed under which each of the approaches can yield a valid response. In the DIII-D cases studied, these criteria show a breakdown in the linear theory despite the small 10−3 relative magnitude of the applied magnetic field perturbations in this case. For nonlinear dynamical evolution simulations to reach a saturated non...