Wang, G.Y. Chen, J.X. Kang, L. Yu, J.B. Zhang, J.S. JACoW Publishing Geneva, Switzerland 978-3-95450-207-3 10.18429/JACoW-MEDSI2018-WEPH32 English 277-279 WEPH32 collimation dipole synchrotron radiation synchrotron-radiation Contribution to a conference proceedings 2018 2018-12 https://doi.org/10.18429/JACoW-MEDSI2018-WEPH32 http://jacow.org/medsi2018/papers/weph32.pdf In order to adjust the collimation of the light source magnet, a layered magnet girder is developed, which can adjust the six degrees of freedom accurately and reduce the mutual influence of the adjustment process between the various layers of the girder. The precision of the collimation is up to 5 microns.