Study of a low β classical tearing mode in DIII-D
Study of a low β classical tearing mode in DIII-D
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DOI：
10.1063/1.1510666
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发表时间：
2002-10
影响因子：
2.2
通讯作者：
M. Chu;R. L. Haye;M. Austin;L. Lao;E. Lazarus;A. Pletzer;C. Ren;E. Strait;T. Taylor;F. Waelbroeck
中科院分区：
文献类型：
--
作者：
M. Chu;R. L. Haye;M. Austin;L. Lao;E. Lazarus;A. Pletzer;C. Ren;E. Strait;T. Taylor;F. Waelbroeck
在 DIII-D 中对低 β 等离子体的撕裂模式稳定性进行了实验研究 [J. L.Luxon，Nucl。 Fusion 42, 614 (2002)]托卡马克。测量等离子体的线性和非线性特性并与理论预测进行比较。与新古典撕裂模式相比，新古典撕裂模式发生在高 β 且由自举电流效应主导，在低 β 状态下，新古典自举电流效应最小。因此，稳定性特性更适合与目前可用的理论代码进行比较。在线性相中，发现不稳定性的发生可以通过平衡重建来预测，以与撕裂模式自由能的可用性相一致。在非线性阶段，温度及其波动幅度和相位已被拟合，以实现具有假设的扰动本征函数的扰动三维平衡的预测。
The tearing mode stability of low β plasmas is studied experimentally in the DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] tokamak. The linear and nonlinear characteristics of the plasma are measured and compared with theoretical predictions. In contrast to the neoclassical tearing mode, which occurs at high β and is dominated by the bootstrap current effect, in the low β regime the neoclassical bootstrap current effect is minimal. Thus the stability properties are more amenable to comparison with presently available theoretical codes. In the linear phase, the onset of the instability has been found to be predictable from equilibrium reconstruction to agree with the availability of the tearing mode free energy. In the nonlinear phase, the temperature and its fluctuation amplitude and phase have been fitted to the prediction of achieving a perturbed three-dimensional equilibrium with an assumed perturbation eigenfunction.