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@inproceedings{wu:srf2023-thiaa01, author = {X.W. Wu and J.F. Chen and P.C. Dong and X. Huang and Y.W. Huang and Y.F. Liu and X.H. Ouyang and S. Sun and Z. Wang and J.N. Wu and R.Z. Xia and S. Xing and Y.X. Zhang and S.J. Zhao and Y.L. Zhao and Y. Zong}, % author = {X.W. Wu and J.F. Chen and P.C. Dong and X. Huang and Y.W. Huang and Y.F. Liu and others}, % author = {X.W. Wu and others}, title = {{Development of 3.9 GHz 9-Cell Cavities at SHINE}}, % booktitle = {Proc. SRF'23}, booktitle = {Proc. 21th Int. Conf. RF Supercond. (SRF'23)}, pages = {921--924}, eid = {THIAA01}, language = {english}, keywords = {cavity, electron, linac, FEL, laser}, venue = {Grand Rapids, MI, USA}, series = {International Conference on RF Superconductivity}, number = {21}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {09}, year = {2023}, issn = {2673-5504}, isbn = {978-3-95450-234-9}, doi = {10.18429/JACoW-SRF2023-THIAA01}, url = {https://jacow.org/srf2023/papers/thiaa01.pdf}, abstract = {{The Shanghai high-repetition-rate XFEL and extreme light facility (SHINE) Linac requires two 3.9~GHz crymodules to linearize energy distribution before the bunch compressor. As a key component to the project, studies of 3.9~GHz cavities were conducted in the past few years. The first 3.9~GHz 9-cell prototype cavity has been fabricated, tested, and qualified. It reached Q₀=3.5×10⁹ at 13.1~MV/m and a maximum accelerating gradient of 25.0~MV/m during the vertical test of the bare cavity. The prototype has been helium tank integrated and reached Q₀=2.9×10⁹ at 13.1~MV/m in the vertical test, with a large margin with respect to the SHINE specification. The second prototype has been fabricated and is planned to be tested in 2023. This paper will cover the fabrication, surface treatment, and RF test of the 3.9~GHz cavities.}}, }