TEMPEST simulations of collisionless damping of the geodesic-acoustic mode in edge-plasma pedestals.
TEMPEST simulations of collisionless damping of the geodesic-acoustic mode in edge-plasma pedestals.
复制标题
DOI：
10.1103/physrevlett.100.215001
复制
发表时间：
2007-05
影响因子：
8.6
通讯作者：
X. Xu;Z. Xiong;Zhe Gao;Nevins Wm;McKee Gr
中科院分区：
文献类型：
--
作者：
X. Xu;Z. Xiong;Zhe Gao;Nevins Wm;McKee Gr
完全非线性（全f）四维TEMPEST回旋动力学连续体代码正确地产生频率和无碰撞阻尼的测地线声学模式（GAM）和带状流，与完全非线性玻尔兹曼电子的反纵横比扫描和托卡马克安全因子q扫描均匀等离子体。TEMPEST模拟表明，在陡的密度和温度梯度下，GAM以出射波的形式存在于边缘基座中。增强的GAM阻尼可以解释GAM振幅的边缘q标度上的实验束发射光谱测量。
The fully nonlinear (full-f) four-dimensional TEMPEST gyrokinetic continuum code correctly produces the frequency and collisionless damping of geodesic-acoustic modes (GAMs) and zonal flow, with fully nonlinear Boltzmann electrons for the inverse aspect ratio scan and the tokamak safety factor q scan in homogeneous plasmas. TEMPEST simulations show that the GAMs exist in the edge pedestal for steep density and temperature gradients in the form of outgoing waves. The enhanced GAM damping may explain experimental beam emission spectroscopy measurements on the edge q scaling of the GAM amplitude.