中文摘要：

在研制用于高能中性束注入器的兆瓦级强流离子源时，关键的一环是对用于产生兆瓦级离子束的加速电极的位置度进行测量和分析。以EAST—NBI强流离子源地电极模块为测量对象，通过应用三象限点采样法获得电极管实际轴线上的测点坐标以及采用MATLAB最优函数对测点坐标进行分析的方法，得到了符合最小区域的位置度误差以及电极管的分布规律。该方法计算过程简单、稳定，可实现自动化测量，为电极模块加工工艺的改进与定犁提供依据。

英文摘要：

Background： Accelerate grid for producing several tens of MW ion beams is a critical component of the megawatt level high current ion source for the high power neutral beam injection. Purpose： To measure and analyze the position of accelerate grid. Methods： Taking the exit grid module of EAST-NBI high current ion source as the measurement object, the observation point coordinates of accelerate grid rail＇s actual axis are obtained by using 3 quadrantel points sampling method and the point coordinates are analyzed by using MATLAB optimal function. Results： The position error that tallies with minimum zone and the distribution regularities of accelerate grid rails are obtained. Conclusions： This method has simple and stable course of evaluating, can realize automatic measurement and provide the basis for improving and finalizing the grid module＇s processing technic.