Abstract: The statistical method is used to analyze the asymmetric error field resulting from misalignment of PF and TF coils in EAST. The results show that the critical error field is beyond the scope of the physical requirement, so a set of correction coils should be designed to compensate the error field of the device.

Key words: Asymmetric error field, Misalignment, Fourier decomposition, Critical error field, Statistical method

摘要： 采用统计分析的方法，分析了EAST装置由PF和TF线圈装配偏差引起的非轴对称误差场。结果表明，EAST装置临界误差场超出了给定的物理要求，应当设计校正场线圈来降低装置的误差场。

关键词: 非轴对称误差场, 装配偏差, 傅里叶分解, 临界误差场, 统计方法