Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2017, Vol. 28 ›› Issue (4): 46 doi: 10.1007/s41365-017-0208-9

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Thermal analysis and tests of W/Cu brazing for primary collimator scraper in CSNS/RCS

Jie-Bing Yu1,2 • Jia-Xin Chen1,2 • Ling Kang1,2 • Jie-Feng Wu3 • Yi-Qing Zou1,2   

  1. 1 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
    2 Dongguan Neutron Science Center, Dongguan 523803, China
    3 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
  • Contact: Jie-Bing Yu
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Jie-Bing Yu, Jia-Xin Chen, Ling Kang, Jie-Feng Wu, Yi-Qin Zou. Thermal analysis and tests of W/Cu brazing for primary collimator scraper in CSNS/RCS.Nuclear Science and Techniques, 2017, 28(4): 46     doi: 10.1007/s41365-017-0208-9


To the transverse beam collimation system in a rapid cycling synchrotron, an important component is the primary collimator, which improves emittance of the beam
halo particles such that the particles outside the predefined trajectory can be absorbed by the secondary collimators. Given the material properties and power deposition distribution, the beam scraper of the primary collimator is a 0.17 mm tungsten foil on a double face-wedged copper block of 121.5 mm 9 20 mm. The heat is transferred to
the outside by a /34 mm copper rod. In this paper, for minimizing brazing thermal stress, we report our theoretical analysis and tests on brazing the tungsten and copper
materials which differ greatly in size. We show that the thermal stress effect can be controlled effectively by creating stress relief grooves on the copper block and inserting
a tungsten transition layer into the copper block. This innovation contributes to the successful R&D of the primary collimator. And this study may be of help for working
out a brazing plan of similar structures.

Key words: Scraper of primary collimator of CSNS/RCS, W/Cu brazing, Thermal analysis, Brazing tests