Improving the stability of pulse superconducting radio frequency cavities by the construction of an Al–Nb double layer structure

Author:

Wang Zhi12ORCID,He Yuan23ORCID,Huang Qitong23ORCID,Liang Zehua24ORCID,Xiao Liangang1ORCID,Xu Mengxin23ORCID,Li Xiaoli24ORCID,Li Chunlong2ORCID,Wang Zhijun23ORCID,Liu Lubei24ORCID,Liu Tong2ORCID,Zhang Shengxue2ORCID,Jiang Tiancai2ORCID,Guo Hao25ORCID,Xiong Pingran2ORCID,Min Yonggang1ORCID,Liu Yidong6ORCID,Wu Jiahao1ORCID,Wang Changlin24ORCID,Liu Guo Chang24ORCID,Liu Xiaoqi24ORCID,Wang Jiyu2ORCID,Liu Zheng24ORCID,Wang Fengfeng23ORCID

Affiliation:

1. School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, P. R. China

2. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, P. R. China

3. Advanced Energy Science and Technology Guangdong Laboratory, Huizhou 529599, P. R. China

4. University of Chinese Academy of Sciences, Beijing 100049, P. R. China

5. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, P. R. China

6. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, P. R. China

Abstract

Superconducting Radio Frequency technologies are widely employed in particle accelerators to explore the frontiers of science. Pure niobium cavity with 2.8–4[Formula: see text]mm thickness is the traditional technology of a compromise between the thermal conduction and mechanic stability. To meet the requirements of the higher stability of accelerators such as ADS linac, high intensity pulse linac, a solution for enhancing the stability of superconducting cavities by the Al–Nb double layer structure is proposed while maintaining enough heat transfer capacity. In this work, a 3.9[Formula: see text]GHz single cell Al–Nb elliptical cavity was fabricated to validate this proposal. During the vertical testing, the cavity shows a significant enhancement in the mechanical stability with LFD coefficient reduction by 88% compared to the pure Nb cavity and [Formula: see text] value is kept at the same level. Additionally, the basic parameters of Al–Nb composite material were tested and reported as well.

Funder

China initiative Accelerator Driven System

Publisher

World Scientific Pub Co Pte Ltd

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