【作者】 沈勇； 董家齐； 李佳；

【Author】 SHEN Yong;DONG Jia-qi;LI Jia;Southwestern institute of physics;School of mathematics and Science,Chengdu university of technology;

【机构】 核工业西南物理研究院； 成都理工大学数理学院；

【摘要】 通过回旋动理学模拟对托卡马克中的动理学气球模及其参数稳定化进行了定性研究。考虑了具有Shafranov位移的圆形托卡马克放电,并采用了s-α平衡模型。由此确定托卡马克存在第二个KBM稳定区,并给出了实验上达到或接近第二稳定区的方法。首次揭示了当杂质密度剖面与电子和主离子密度剖面有相同的峰化方向时,杂质对模起稳定化作用,这是由于杂质的存在使可压缩性效应被削弱。结果还表明,模的最大增长率出现在磁剪切的拐点s_c=q/4-q/2处,但由于η_i和杂质类等其他等离子体参数的变化,这个公式可能会有所变化。本文提出了KBM的一些参数稳定化措施。更多还原

【Abstract】 Kinetic Ballooning Mode(KBM) and its parametric stabilization in tokamaks are studied qualitatively by means of gyrokinetic simulation.The circular magnetic tokamak discharge with the Shafranov shift is considered and the s-αmodel equilibrium is employed.As a result,the existence of,and approaching way to the second KBM stable regime were identified.It was firstly revealed that impurities play a role of stabilizing when the impurity density profile peaks in the same direction to those of the electrons and main ion density profiles,owing to that compressibility effect is weakened.It shows that the mode maximum growth rate appears at the turning point of magnetic shear s_c=q/4-q/2,while the formula can be modified due to other plasma parameters such as η_i and impurity species.Some parametric stabilizations of KBM are suggested.更多还原