Spectroscopic determination of the internal amplitude of frequency sweeping TAE
Spectroscopic determination of the internal amplitude of frequency sweeping TAE
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DOI：
10.1088/0741-3335/46/7/s04
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发表时间：
2004-07
影响因子：
2.2
通讯作者：
S. Pinches;H. Berk;M. Gryaznevich;S. Sharapov;J. Contributors
中科院分区：
文献类型：
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作者：
S. Pinches;H. Berk;M. Gryaznevich;S. Sharapov;J. Contributors
从理解的过程中，导致系统的边缘不稳定的本征模的频率扫描，它示出了如何可以确定的模式的绝对峰值振幅从光谱测量的频率扫描速率，例如，与Mirnov线圈外的等离子体。在实现这种诊断计算的第一次尝试中，MISHKA代码（Mikhailovskii A B et al 1997 Plasma Phys.Rep.23 844）用于确定环形Alfven本征模（TAE）的全局模结构（Cheng C Z等人1985 Ann. Phys.（NY）161 21）在MAST球形托克马克中观察到（Sykes A等人2001 Nucl. Fusion 41 1423）。使用HAGIS代码（Pinches S D 1996 PhD Thesis The University of诺丁汉，Pinches S D et al 1998 Comput.物理通信111 131），然后复制实验观察到的扫描现象。然后，使用这些模拟结果的基本理论，预测从所观察到的频率扫描的内部场振幅。计算出的模式振幅示出同意从Mirnov线圈测量获得的。
From an understanding of the processes that cause a marginally unstable eigenmode of the system to sweep in frequency, it is shown how the absolute peak amplitude of the mode can be determined from the spectroscopic measurements of the frequency sweeping rate, e.g. with Mirnov coils outside the plasma. In a first attempt to implement such a diagnostic calculation, the MISHKA code (Mikhailovskii A B et al 1997 Plasma Phys. Rep. 23 844) is used to determine the global mode structure of toroidal Alfven eigenmodes (TAEs) (Cheng C Z et al 1985 Ann. Phys. (NY) 161 21) observed in the MAST spherical tokamak (Sykes A et al 2001 Nucl. Fusion 41 1423). Simulations using the HAGIS code (Pinches S D 1996 PhD Thesis The University of Nottingham, Pinches S D et al 1998 Comput. Phys. Commun. 111 131) are then made, replicating the experimentally observed sweeping phenomena. The fundamental theory is then used together with these simulation results to predict the internal field amplitude from the observed frequency sweeping. The calculated mode amplitude is shown to agree with that obtained from Mirnov coil measurements.