Turbulence stabilization in tokamak plasmas with high population of fast ions
Turbulence stabilization in tokamak plasmas with high population of fast ions
复制标题
具有大量快离子的托卡马克等离子体的湍流稳定性
DOI：
10.1088/1741-4326/acffda
复制
发表时间：
2023
期刊：
影响因子：
3.3
通讯作者：
C. Sung
中科院分区：
文献类型：
--
作者：
Donguk Kim;Sangjin Park;G. Choi;Y. W. Cho;Jisung Kang;Hyunsun Han;Jeff Candy;E. Belli;T. Hahm;Yong;C. Sung
这封信提供了一个新的物理洞察快离子对具有高快离子分数和峰值快离子密度分布的等离子体中湍流的影响。我们阐明了快离子在快离子调节增强模等离子体中导致内输运势垒形成的湍流稳定机制。线性和非线性陀螺动力学模拟都表明，湍流抑制机制主要是稀释效应。特别是，我们首次发现，仅用快离子引起的反转的主离子密度梯度就可以充分抑制湍流。这里报道的新的物理发现提高了我们对快离子对湍流的影响的理解，这对于聚变能量的产生是必不可少的。此外，他们将开辟一种新的方法来控制适用于广泛的等离子体约束制度的等离子体湍流。
This letter provides a new physical insight into the fast ion effects on turbulence in plasmas having a high fast ion fraction and peaked fast ion density profile. We elucidate turbulence stabilization mechanisms by fast ions that result in internal transport barrier formation in the fast ion regulated enhancement mode plasma. Both linear and nonlinear gyrokinetic simulations show that the dominant turbulence suppression mechanisms are the dilution effects. In particular, we find that turbulence can be sufficiently suppressed solely by an inverted main ion density gradient due to fast ions, for the first time. New physical findings reported here improve our understanding of fast ion effects on turbulence, essential for fusion energy production where . Moreover, they will open up a new methodology to control plasma turbulence applicable to a wide range of plasma confinement regimes.