Saturated internal instabilities in advanced-tokamak plasmas
Saturated internal instabilities in advanced-tokamak plasmas
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DOI：
10.1209/0295-5075/90/55001
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发表时间：
2010-06
期刊：
影响因子：
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通讯作者：
M. Hua;I. Chapman;S. Pinches;R. Hastie;the Mast Upgrade team
中科院分区：
文献类型：
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作者：
M. Hua;I. Chapman;S. Pinches;R. Hastie;the Mast Upgrade team
“先进托卡马克”（AT）方案的目的是在未来潜在的托卡马克聚变发电厂达到稳态运行。AT场景表现出非单调到平坦的安全系数曲线（q，磁场线间距的度量），最小q（qmin）略高于整数值（qs）。然而，据预测，这些q配置文件是不稳定的理想磁流体动力学不稳定性的qmin的方法qs。这些理想的不稳定性，观察和诊断为这样的第一次在MAST等离子体与AT-样的q分布，具有深远的影响，如约束退化，平坦的环形核心旋转或增强的快速离子损失。这些观测结果激发了先进托卡马克等离子体的稳定性分析，以期为AT场景中的稳定性阈值提供指导。此外，所测得的旋转阻尼相比，自洽计算的预测，从新古典环形粘度理论。
“Advanced tokamak” (AT) scenarios were developed with the aim of reaching steady-state operation in future potential tokamak fusion power plants. AT scenarios exhibit non-monotonic to flat safety factor profiles (q, a measure of the magnetic field line pitch), with the minimum q (qmin) slightly above an integer value (qs). However, it has been predicted that these q profiles are unstable to ideal magnetohydrodynamic instabilities as qmin approaches qs. These ideal instabilities, observed and diagnosed as such for the first time in MAST plasmas with AT-like q profiles, have far-reaching consequences like confinement degradation, flattening of the toroidal core rotation or enhanced fast ion losses. These observations motivate the stability analysis of advanced-tokamak plasmas, with a view to provide guidance for stability thresholds in AT scenarios. Additionally, the measured rotation damping is compared to the self-consistently calculated predictions from neoclassical toroidal viscosity theory.