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束流位置探头电中心相对于邻近四极磁铁磁中心的位置偏移，可以通过基于束流的准直技术加以确定，其准直精度可以比用传统的准直方法提高一个数量级．介绍了基于束流的准直的基本原理和在ＢＥＰＣ储存环上的初步实验结果，以及对今后进一步开展该项实验研究的设想．
The position shift of the beam position probe center relative to the magnetic center of the adjacent quadrupole magnet can be determined by a beam-based collimation technique with an accuracy of an order of magnitude greater than with conventional collimation methods. The basic principle of beam-based collimation and the preliminary experimental results on BEPC storage ring are introduced, as well as the idea of further carrying out the experimental study in the future.