A new method of radial potential profile measurement utilizing magnetic field gradient near a mirror throat
A new method of radial potential profile measurement utilizing magnetic field gradient near a mirror throat
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利用镜喉附近磁场梯度测量径向电势剖面的新方法
DOI：
10.1063/1.1146981
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发表时间：
1996
影响因子：
1.6
通讯作者：
T. Tamano
中科院分区：
文献类型：
--
作者：
K. Ishii;Y. Katsuki;Akira Abe;T. Takahashi;T. Goto;N. Kikuno;I. Katanuma;A. Itakura;K. Yatsu;T. Tamano
将金中性束沿着串列镜<$10中的塞/势垒单元的内镜喉附近的主弦垂直注入等离子体柱中，以便直接测量一次发射期间静电径向电势分布的时间演化。新方法注意到这样一个事实，即在中性束在等离子体柱中的路径上的每个点处被电离的离子的轨迹由于磁场梯度和静电势而移动。在行进大约半个周期的拉莫尔运动之后，离子由板式离子检测器检测。等离子体电势的径向分布通过分析离子束点在检测器平面上的位置来确定。这种方法的主要优点是，在强磁场区域的径向电位分布可以测量作为时间的函数，在一个拍摄过程中没有扫描入射束角。
A gold neutral beam is perpendicularly injected into a plasma column along a main chord near an inner mirror throat of a plug/barrier cell in the tandem mirror GAMMA 10, in order to directly measure time evolution of the electrostatic radial potential profile during one shot. The new method pays attention to the fact that trajectories of the ions, which are ionized at each point on the path of the neutral beam in the plasma column, are shifted due to the magnetic field gradient and the electrostatic potential. After traveling about a half period of Larmor motion, ions are detected by a plate type of ion detector. The radial profiles of the plasma potential are determined analyzing positions of the ion beam spots on the detector plane. The main advantage of this method is that radial potential profiles in a strong magnetic field region can be measured as a function of time during one shot without sweeping incident beam angles.