TY  - CONF
AU  - Zong, Y.
AU  - Chen, J.F.
AU  - Chen, Q.X.
AU  - Dong, P.C.
AU  - Hou, H.T.
AU  - Huang, X.
AU  - Huang, Y.W.
AU  - Pu, X.Y.
AU  - Shi, J.
AU  - Sun, S.
AU  - Wang, D.
AU  - Wang, Z.
AU  - Wu, J.N.
AU  - Wu, X.W.
AU  - Xing, S.
AU  - Zhao, S.J.
AU  - Zhao, Y.L.
ED  - Saito, Kenji
ED  - Xu, Ting
ED  - Sakamoto, Naruhiko
ED  - Schaa, Volker R.W.
ED  - Thomas, Paul W.
TI  - Realization of Accelerating Gradient Larger than 25 MV/m on High-Q 1.3 GHz 9-Cell Cavities for SHINE
J2  - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023
CY  - Grand Rapids, MI, USA
T2  - International Conference on RF Superconductivity
T3  - 21
LA  - english
AB  - We present our studies on the optimized nitrogen-doping and medium-temperature baking recipes applied on 1.3GHz SRF cavities, aiming at meeting the requirements of the SHINE project. The optimized nitrogen-doping process resulted in achieving a Q₀ of over 4.0×10¹0 at medium field and a maximum accelerating gradient exceeding 35 MV/m on single cell cavities, and a Q₀ of over 2.8×10¹0 at medium field and a maximum accelerating gradient exceeding 26 MV/m in 9-cell cavities. For 1.3 GHz 9-cell cavities subjected to medium-temperature baking, Q₀ values exceeding 3.5×10¹0 at 16 MV/m and maximum accelerating gradients surpassing 25 MV/m were achieved. These studies provide two options of high-Q recipes for SHINE cavities. The treatment processes of cavities and their vertical test results are described in this paper.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 658
EP  - 661
KW  - cavity
KW  - accelerating-gradient
KW  - SRF
KW  - experiment
KW  - FEL
DA  - 2023/09
PY  - 2023
SN  - 2673-5504
SN  - 978-3-95450-234-9
DO  - doi:10.18429/JACoW-SRF2023-WEPWB044
UR  - https://jacow.org/srf2023/papers/wepwb044.pdf
ER  - 

TY  - CONF
AU  - Wu, X.W.
AU  - Chen, J.F.
AU  - Dong, P.C.
AU  - Huang, X.
AU  - Huang, Y.W.
AU  - Liu, Y.F.
AU  - Ouyang, X.H.
AU  - Sun, S.
AU  - Wang, Z.
AU  - Wu, J.N.
AU  - Xia, R.Z.
AU  - Xing, S.
AU  - Zhang, Y.X.
AU  - Zhao, S.J.
AU  - Zhao, Y.L.
AU  - Zong, Y.
ED  - Saito, Kenji
ED  - Xu, Ting
ED  - Sakamoto, Naruhiko
ED  - Schaa, Volker R.W.
ED  - Thomas, Paul W.
TI  - Development of 3.9 GHz 9-Cell Cavities at SHINE
J2  - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023
CY  - Grand Rapids, MI, USA
T2  - International Conference on RF Superconductivity
T3  - 21
LA  - english
AB  - 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.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 921
EP  - 924
KW  - cavity
KW  - electron
KW  - linac
KW  - FEL
KW  - laser
DA  - 2023/09
PY  - 2023
SN  - 2673-5504
SN  - 978-3-95450-234-9
DO  - doi:10.18429/JACoW-SRF2023-THIAA01
UR  - https://jacow.org/srf2023/papers/thiaa01.pdf
ER  -