Distortion of fuel-ion distribution functions by Alfven eigenmodes in a tokamak DT plasma
Distortion of fuel-ion distribution functions by Alfven eigenmodes in a tokamak DT plasma
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托卡马克 DT 等离子体中阿尔文本征模导致的燃料离子分布函数的畸变
DOI：
10.1088/1361-6587/aad76d
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发表时间：
2018
影响因子：
2.2
通讯作者：
K. Ogawa
中科院分区：
文献类型：
--
作者：
S. Sugiyama;H. Matsuura;K. Ogawa
当模式振幅较大时，Alfvén本征模可以使燃料离子速度分布函数从麦克斯韦分布函数发生畸变，从而提高聚变反应速率系数。假设一个类ITER的氘氚等离子体包含一个激发的Alfvén本征模，我们研究了修改后的氘和氚的速度分布函数和由此产生的聚变反应速率系数。结果表明，由于环形Alfvén本征模或椭圆度引起的Alfvén本征模，分布函数中的非麦克斯韦分量在平行和反平行于磁力线的方向上形成。针对分布函数畸变的影响，讨论了聚变反应速率系数的增强与模振幅的关系，并确定了增强速率系数所需的阈值振幅。
Fuel-ion velocity distribution functions can be distorted from a Maxwellian by Alfvén eigenmodes when the mode amplitudes are large, and the fusion reaction rate coefficient can be enhanced by the distortion. Assuming an ITER-like deuterium–tritium plasma containing an excited Alfvén eigenmode, we have investigated the modified deuteron and triton velocity distribution functions and the resulting fusion reaction rate coefficient. It is found that the non-Maxwellian components in the distribution functions form in directions parallel and antiparallel to the magnetic field lines due to the toroidal Alfvén eigenmodes or the ellipticity-induced Alfvén eigenmodes. Focusing on the effect of the distortion of the distribution functions, we discuss the dependence of the enhancement of the fusion reaction rate coefficient on the mode amplitudes and determine the threshold amplitude necessary to enhance the rate coefficient.