Hybrid simulation of fishbone instabilities with reversed safety factor profile
Hybrid simulation of fishbone instabilities with reversed safety factor profile
复制标题
具有反向安全系数曲线的鱼骨不稳定性的混合模拟
DOI：
10.1088/1741-4326/abab50
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发表时间：
2020-09
期刊：
影响因子：
3.3
通讯作者：
Zhenzhen Ren
中科院分区：
文献类型：
--
作者：
Wei Shen;Feng Wang;G.Y. Fu;Liqing Xu;Zhenzhen Ren
利用M3 D-K程序研究了具有反向安全因子剖面的鱼骨形不稳定性的线性稳定性和非线性动力学特性。对于具有反向q剖面的鱼骨形失稳，存在两种不同类型的鱼骨形失稳：具有双q = 1表面的双共振鱼骨形（DRF）和安全系数qmin的最小值略大于1的非共振鱼骨形（NRF）。基于类EAST参数的线性模拟表明，当快离子压强超过临界值时，DRF被俘获束离子激发，由于双q = 1面的存在，DRF的模式结构呈现分裂径向结构.当qmin从小于1增加到大于1时，鱼骨不稳定性从DRF向NRF过渡，NRF的模式频率高于DRF，因为NRF与旋进频率较大的快离子共振。非线性模拟表明，饱和的DRF是由于磁流体的非线性与一个大的n = 0的分量。然而，NRF的饱和主要是由于快离子的非线性，并且NRF的频率非线性地下降。由于DRF或NRF，快离子被重新分布并变得平坦，并且由于NRF，快离子的输运能级较弱，与DRF相比，具有更多的中心径向重新分布区域。
Linear stability and non-linear dynamics of the fishbone instabilities with reversed safety factor profile have been investigated by the global kinetic-magnetohydrodynamic (MHD) code M3D-K. For the consideration of the fishbone instability with a reversed q profile, there are two different types of the fishbone instability: dual resonant fishbone (DRF) with double q = 1 surfaces and non-resonant fishbone (NRF) with the minimum value of safety factor qmin a little larger than unity. Based on EAST-like parameters, linear simulations show that the DRF is excited by the trapped beam ions when the fast ion pressure exceeds a critical value, and the mode structure of DRF exhibits splitting radial structure due to double q = 1 surfaces. When qmin increases from below unity to above unity, the fishbone instability transits from the DRF to the NRF, and the mode frequency of the NRF is higher than the DRF as the NRF is resonant with fast ions with larger precessional frequency. Nonlinear simulations show that the saturation of the DRF is due to MHD non-linearity with a large n = 0 component. However, the saturation of the NRF is mainly due to the non-linearity of fast ions, and the frequency of the NRF chirps down nonlinearly. The fast ions are redistributed and become flattened due to the DRF or the NRF, and the transport level of the fast ions due to the NRF is weaker with more centrally radial redistribution region in comparison with that of the DRF.
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影响因子：
1.6
作者：
S. Goeler;A. Roquemore;L. C. Johnson;M. Bitter;M. Diesso;E. Fredrickson;D. Long;J. Strachan
通讯作者：
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影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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DOI：
10.2172/750291
发表时间：
1999-04
期刊：
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影响因子：
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作者：
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通讯作者：
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