磁約束核融合電漿中漂移阿爾文波偏振的測量
PHYSICAL REVIEW LETTERS
Xiaodi Du, Liu Chen(陳騮), William W. Heidbrink, Michael A. Van Zeeland, Max E. Austin, Jie Chen, Yueqiang Liu, George R. McKee, and Zheng Yan
First Measurement of Drift-Alfvén Wave Polarization in Magnetically Confined Fusion Plasmas
漂移聲波和剪切阿爾文波是磁化電漿中的兩種基本電磁波動，它們在各種電漿成分的動力學和傳輸中都扮演著至關重要的角色。在托卡馬克核融合裝置中，這兩種波動會耦合再一起，但是到目前為止，都還沒有可靠的方法來確定觀察到的波動的相對偏振性。在這項研究工作中，我們基於迴旋動力學理論與實驗量測的電子密度和溫度，開發了一種新穎且廣泛適用的方法來確定漂移阿爾文波的極化性，並將此方法應用於 DIII-D 裝置，首次在托卡馬克裝置中提供漂移阿爾文波偏振測量。
Drift-acoustic wave and shear Alfven wave are two fundamental electromagnetic fluctuations in magnetized plasmas. They both play crucial roles in the dynamics and transports of various components of plasmas. In fusion devices; such as tokamaks, these two waves are coupled and , up to now, there has not been a reliable technique to determine the relative polarizations of the observed fluctuations. In this work, we have, based on the gyrokinetic theory and using electron density and temperature measurements, developed a novel and widely applicable method to determine the drift-Alfven wave polarization. This technique is then applied to the DIII-D device and provides , for the first time, drift-Alfven wave polarization measurements in a tokamak device.