Numerical investigation of the fishbone instability effect on thermal pressure in EAST tokamak
Numerical investigation of the fishbone instability effect on thermal pressure in EAST tokamak
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DOI：
10.1063/5.0102470
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发表时间：
2022-07
期刊：
影响因子：
1.6
通讯作者：
Z. Ren;W. Shen;Guoqiang Li;Muquan Wu;Jinhong Yang;Weihua Wang
中科院分区：
文献类型：
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作者：
Z. Ren;W. Shen;Guoqiang Li;Muquan Wu;Jinhong Yang;Weihua Wang
在实验先进超导托卡马克(EAST)上观察到鱼骨不稳定性出现后，内输运势垒(ITB)的形成。应用动力学-磁流体混合程序M3D-K，以EAST Shots 71320为例，研究了鱼骨不稳定对热压的影响。在没有流体非线性的情况下，发现当总压分布的中心梯度高于某一阈值时，由于鱼骨不稳定性的非线性演化，热压分布变得更加尖峰，这证实了鱼骨不稳定性可以将热压径向向内输送，促进ITB的形成。当包含流体非线性时，极向带状流动防止了核心区的热压变得更加峰值。由于新古典主义效应会引起极向纬向流的衰减，在我们的模拟中被忽略，因此鱼骨不稳定性对ITB形成的实际促进作用预计介于无流体非线性和有流体非线性之间。
The formation of the internal transport barrier (ITB) is observed after the emergence of fishbone instabilities on the Experimental Advanced Superconducting Tokamak (EAST). The kinetic–magnetohydrodynamic hybrid code M3D-K has been applied to investigate the fishbone instability effect on thermal pressure based on EAST Shot No. 71320. Without fluid nonlinearity, it is found that when the central gradient of the total pressure profile is above a threshold, the thermal pressure profile becomes more peaked due to the nonlinear evolution of the fishbone instability, which confirms that the fishbone instability can transport the thermal pressure radially inward and promote the ITB formation. When fluid nonlinearity is included, the poloidal zonal flow prevents the thermal pressure to become more peaked in the core region. As the neoclassical effect can cause the damping of the poloidal zonal flow and is neglected in our simulation, the actual promotion of ITB formation due to the fishbone instability is expected to be between that without fluid nonlinearity and with fluid nonlinearity.