Understanding and optimization of the coating process of the radio-frequency Nb3Sn thin film superconducting cavities using tin vapor diffusion method

Jiang, Guangze; Wu, Shuai; Yang, Ziqin; He, Yuan; Ye, Yang; Guo, Hao; Li, Chunlong; Xiong, Pingran; Li, Lu; Huang, Shichun; Wu, Andong; Qiu, Feng; Zhang, Junhui; Niu, Xiaofei; Huang, Qinggang; Qin, Zhi; Tan, Teng; Wang, Zhijun; Zhang, Shenghu; Zhao, Hongwei; Zhan, Wenlong

doi:10.1016/j.apsusc.2023.158708

Cited by 4 publications

(1 citation statement)

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“…SEM images revealed satisfactory film growth, with no abnormally large or thin grains. It is noteworthy that no residual Sn particles appeared on the NF44n samples, although the dense white spots found at the beam pipe region generally predicted an excess of Sn vapor in some previous experiments at other labs [36]. This implies that the design of the furnace structure is reasonable.…”

Section: Discussionmentioning

confidence: 57%

First Results of Nb3Sn Coated Cavity by Vapor Diffusion Method at SARI

Chen,

Zong,

Wang

et al. 2024

Coatings

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Nb3Sn is emerging as one of the focal points in superconducting radio frequency (SRF) research, owing to its excellent superconducting properties. These properties hold significant possibilities for cost reduction and the miniaturization of accelerators. In this paper, we report the recent efforts of the Shanghai Advanced Research Institute (SARI) in fabricating high-performance Nb3Sn superconducting cavities using the vapor diffusion method. This includes the construction of a Nb3Sn coating system with dual evaporators and the test results of 1.3 GHz single-cell coated cavities. The coated samples were characterized, and the growth state of the Nb3Sn films was analyzed. The first coated superconducting cavity was tested at both 4.4 K and 2 K, with different cooldown rates passing through the Nb3Sn critical temperatures. The causes of Sn droplet spot defect formation on the surface of the first cavity were analyzed, and such defects were eliminated in the coating of the second cavity by controlling the evaporation rate. This study provides a reference for the preparation of high-performance Nb3Sn-coated cavities using the vapor diffusion method, including the setup of the coating system, the comprehension of the vapor diffusion process, and the test conditions.

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Section: Discussionmentioning

confidence: 57%