Vacuum joints of dispersion-strengthened copper and its applications in synchrotron radiation front end

• Published in: Nuclear science and techniques Vol. 27; no. 6; pp. 74 - 78
• Main Authors: Li, Yong-Jun, Xue, Song, Zhang, Min, Jia, Dan-Dan, Dou, Dong-Bai, Gao, Yu
• Format: Journal Article
• Language: English
• Published: Singapore Springer Singapore 01.12.2016; Shanghai Institute of Applied Physics, Chinese Academy of Sciences, ZhangJiang, Shanghai 201204, China%SKY Technology Development Co., Ltd, Chinese Academy of Sciences, Shenyang 110179, China
• Subjects: Energy; Hadrons; Heavy Ions; Nuclear Energy; Nuclear Physics; 上海同步辐射装置; 前端; 应用; 弥散强化铜; 焊接接头; 电子束焊接; 真空; 钎焊接头; Dispersion-strengthened copper; Brazing; Electron beam welding; Front end; Synchrotron radiation
• ISSN: 1001-8042; 2210-3147
• DOI: 10.1007/s41365-016-0130-6

Masks are critical elements of synchrotron radiation front end that are exposed to high temperature and stress. The absorber material is typically comprised of dispersion-strengthened copper, which can retain high performance at elevated temperature. Joining processes under vacuum, including brazing and electron beam welding, are novel approaches for prolonging the absorber and for reducing power densities. The mechanical proper- ties of brazed joints and electron beam welded joints of dispersion-strengthened copper workpieces are evaluated by tensile testing at 20, 100, and 200 ~C. The testing results indicate that the tensile strength and elongation of both vacuum joints decrease with increasing temperature. Compared to brazed joints, electron beam welded joints have higher tensile strength, better ductility, and more stable performance. A novel welded mask with a total length of 600 mm is presented and shown to be practical for use in the highest heat load front end in the Shanghai synchrotron radiation facility phase-Ⅱ beamline project.