A magnetically adsorbed fine adjustment mechanism of the second crystal in a double-crystal monochromator

A magnetically adsorbed fine adjustment mechanism of the second crystal in a double-crystal monochromator 1 first-author 1 1 1 1 2 2 Robots Institute, Shanghai Jiaotong University, Shanghai 200030 ; Robots Institute, Shanghai Jiaotong University, Shanghai 200030 ; Institute of High Energy Physics, the Chinese Academy of Sciences, Beijing 100049 Institute of High Energy Physics, the Chinese Academy of Sciences, Beijing 100049 In a fine adjustment mechanism of the second crystal in a double-crystal monochromator, a compression spring is usually used as a return force element, but it often produces permanent deform after some time. A novel fine adjustment mechanism is put forward, which utilizes permanent-magnet as the return force element instead of a compression spring. Its principle and advantages of adjusting the pitch angle and the roll angle are analyzed, and the structure parameters of the permanent-magnet, which is the key part of the fine adjustment mechanism, are optimized. The magnetically adsorbed fine adjustment mechanism has been testified and applied successfully in the double-crystal monochromator of 4W1B beam line in Beijing Synchrotron Radiation Facility (BSRF). Pitch angle Roll angle Magnetically adsorption Fine adjustment The second crystal References Chaoyin Xu , Weichang Zhao , Guoqiang Pan et al . Nuclear Instruments & Methods in Physics Research A , 1998 , 410 : 293 - 296 Nuclear Instruments & Methods in Physics Research A Ryu J W , Gweon D G , Moont K S . Precision Engineering , 1997 , 21 ( 1 ): 18 - 28 Precision Engineering Fu Xuan , Zhou Renkui , Zhou Sizhong et al . Optics and Precision Engineering (in Chinese) , 2001 , 9 ( 1 ): 67 - 70 Optics and Precision Engineering (in Chinese) Li Bo , Cai Guangqi . Machinery Design & Manufacture (in Chinese) , 1999 . ( 4 ): 17 - 18 Machinery Design & Manufacture (in Chinese) Song Houding , Chen Peilin . Permanent-magnet material and application (in Chinese) . Beijing : Machinery Industry Publishing Company , 1984 : 218 - 220 Permanent-magnet material and application (in Chinese) O432.1 2004-10-22 2005-04-01 2021-01-19 2005 Nuclear Science and Techniques 02 16