Energy channeling from energetic particles to bulk ions via beam-driven geodesic acoustic modes-GAM channeling
Energy channeling from energetic particles to bulk ions via beam-driven geodesic acoustic modes-GAM channeling
复制标题
DOI：
10.1088/0741-3335/53/8/085017
复制
发表时间：
2011-08-01
影响因子：
2.2
通讯作者：
Itoh, S-I
中科院分区：
文献类型：
--
作者：
Sasaki, M.;Itoh, K.;Itoh, S-I
提出了一种通过测地线声学模（GAMs）从高能粒子到体离子能量传递的新机制。该机制涉及高能粒子对GAM的激发。通过朗道阻尼，对离子的GAM进行阻尼，通过朗道阻尼，波能量被给予体离子。这个能量交换过程是在准线性理论的框架内制定的。如果GAM的E x B速度达到抗磁速度的水平，则从高能粒子到GAM的能量转移速率可以与通过碰撞与粒子进行能量交换的速率相当。在这种情况下，由于GAM的选择性离子加热，大量离子和电子的能量消耗的分配被实质上修改。
A novel mechanism for energy transfer from energetic particles to bulk ions via geodesic acoustic modes (GAMs) is presented. The mechanism involves the excitation of GAMs by energetic particles. The GAMs are damped on ions by the Landau damping, by which wave energy is given to bulk ions. This process of energy exchange is formulated within the framework of quasilinear theory. The rate of energy transfer from energetic particles to GAMs can be comparable to that of energy exchange to particles via collisions, if the E x B velocity of GAMs reaches the level of diamagnetic velocity. Under this circumstance, the partition of energy absorptions by bulk ions and electrons is substantially modified due to the selective ion heating by GAMs.