Nb3Sn Cavities Coated by Tin Vapor Diffusion Method at Peking University-Reference-Cited by-全球学者库

Nb3Sn Cavities Coated by Tin Vapor Diffusion Method at Peking University

Published:2023-07-26 Issue:15 Volume:13 Page:8618
ISSN:2076-3417
Container-title:Applied Sciences
language:en
Short-container-title:Applied Sciences

Author:

Wang Gai¹,Quan Shengwen¹,Lin Lin¹,Ren Manqian¹,Hao Jiankui¹,Wang Fang¹,Jiao Fei¹^ORCID,Zhu Feng¹,Huang Senlin¹,Yan Xueqing¹²,Zhu Kun¹²

Affiliation:

1. Institute of Heavy Ion Physics & State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China

2. Guangdong Institute of Laser Plasma Accelerator Technology, Guangzhou 510445, China

Abstract

Nb3Sn-coating experiments on samples and single-cell cavities were conducted at Peking University (PKU) to understand the Nb3Sn growth process using the vapor diffusion method. The evaporation of tin and tin chloride used in the vapor diffusion process was simulated and experimentally analyzed. The results show that the nucleation process is generally uniform, and the atomic ratios of Nb/O and Sn/O were found to be 1:2 within the 10 nm surface of the nucleated samples. Three tin sources were distributed along the cavity axis to obtain a uniform grain size on the cavity surface, and a surface tin content of 25~26% was achieved. The tin segregation effect was found in long-time coatings or coatings with insufficient tin, resulting in a low Sn% and bad cavity performance. By overcoming the tin segregation problem, a Nb3Sn cavity with a 750 nm grain size was produced by 1200 °C coating for 80 min and 1150 °C annealing for 60 min. The acceleration gradient reached 17.3 MV/m without quenching and an obvious Q-slope at 4.2 K. The relationship between coating recipes and vertical test results is discussed and conclusive advice is provided in this paper.

Funder

State Key Laboratory of Nuclear Physics and Technology, Peking University

Publisher

MDPI AG

Subject

Fluid Flow and Transfer Processes,Computer Science Applications,Process Chemistry and Technology,General Engineering,Instrumentation,General Materials Science

Link

https://www.mdpi.com/2076-3417/13/15/8618/pdf

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