SRF2011 - List of Authors (Li, S.P.)

Paper

Title

Page

IHEP 1.3GHz SRF Technology R&D Status

87

J. Gao, Y.L. Chi, J.P. Dai, H.S. Guo, T.M. Huang, H.Y. Lin, C. H. Li, D.Z. Li, S.P. Li, Z.Q. Li, Z.C. Liu, Q. Ma, W.M. Pan, F. Qiu, Y. Sun, G.W. Wang, Q.Y. Wang, J.Y. Zhai, T.X. Zhao
IHEP Beijing, Beijing, People's Republic of China
R. Ge
IHEP Beijng, Beijing, People's Republic of China

1.3 GHz superconducting radio-frequency (SRF) technology is one of the key technologies for the ILC and future XFEL and ERL projects in China. With the aim to develop 1.3 GHz SRF technology, IHEP has started a program to build an SRF Accelerating Unit. This unit contains a 9-cell 1.3 GHz superconducting cavity, a short cryomodule, a high power input coupler, a tuner, a low level RF system etc. This program also includes the SRF laboratory upgrade, which will permit the unit to be built and tested at IHEP. The unit will be used for the 1.3 GHz SRF system integration study, high power horizontal test and possible beam test in the future. In this paper, we report the recent R&D status of this program. The first large grain low-loss shape 9-cell superconducting RF cavity made by IHEP reached 20 MV/m in the first vertical test. The prototype tuner and LLRF system are under test. The first 1.3 GHz high power input coupler fabrication was finished and the cryomodule is under fabrication. Several key SRF facilities (CBP, CP, HPR, optical inspection camera, pretuning machine etc) for 9-cell cavity surface treatment and pre-tuning were successfully commissioned and in operation.

MOPO062

BEPCII Superconducting RF System Operation Status

247

Y. Sun, J.P. Dai, T.M. Huang, H.Y. Lin, Y.P. Liu, G. Li, S.P. Li, Z.Q. Li, Q. Ma, W.M. Pan, F. Qiu, H. Qu, P. Sha, G.W. Wang, Q.Y. Wang, B. Xu, L.P. Yang, Y.L. Yu, M.C. Zhan, Z. Zhang
IHEP Beijing, Beijing, People's Republic of China

Two KEK-B type 500MHz Superconducting cavities have been used in BEPCII project since the end of 2006. All the maximum RF voltages have been over 1.65MV under the operation with beam power of 100 kW and beam current of 1.89GeV@800mA. During the physics collision mode operation, there is a strange phenomenon of helium gas pressure increasing with the beam current going up, which is dangerous to both cavity and cold box of cryogenics system. To search the unknown heating source, several beam tests had been made, which are HOMs power measurement, contrast of the RF power influence of coaxial coupler with Synchrotron Radiation opeation mode, and the beam synchrotron light influence in different beam orbits.

Poster MOPO062 [0.286 MB]

TUPO052

Fabrication and Test of 500MHz Nb Cavity for BEPCII

512

G.W. Wang, J.P. Dai, X.W. Dai, K. He, H.Y. Lin, Y.P. Liu, H. Li, S.P. Li, Z.Q. Li, Q. Ma, F. Meng, W.M. Pan, X.H. Peng, F. Qiu, P. Sha, Y. Sun, G.P. Wang, Q.Y. Wang, B. Xu, G.Y. Zhao
IHEP Beijing, Beijing, People's Republic of China
J.Z. Li, D.G. Liu
AVIC Beijing Aeromautical Manufacturing Technology Research Institute, People's Republic of China

In order to ensure the stable operation of BEPCII, we had began a superconducting accelerator unit in IHEP 3 years ago. The development and test of 500MHz Nb cavity, which is the key component of the unit, are introduced in this article. The fabrication of three Nb cavities has been finished, and the post-processing and vertical test of the 1st cavity have been completed, too. The technology of fabrication, electron beam welding (EBW), post-processing has been developed. Meanwhile, the related facilities has been improved, too.

Poster TUPO052 [0.288 MB]

Paper	Title	Page
MOPO015	IHEP 1.3GHz SRF Technology R&D Status	87
	J. Gao, Y.L. Chi, J.P. Dai, H.S. Guo, T.M. Huang, H.Y. Lin, C. H. Li, D.Z. Li, S.P. Li, Z.Q. Li, Z.C. Liu, Q. Ma, W.M. Pan, F. Qiu, Y. Sun, G.W. Wang, Q.Y. Wang, J.Y. Zhai, T.X. Zhao IHEP Beijing, Beijing, People's Republic of China R. Ge IHEP Beijng, Beijing, People's Republic of China
	1.3 GHz superconducting radio-frequency (SRF) technology is one of the key technologies for the ILC and future XFEL and ERL projects in China. With the aim to develop 1.3 GHz SRF technology, IHEP has started a program to build an SRF Accelerating Unit. This unit contains a 9-cell 1.3 GHz superconducting cavity, a short cryomodule, a high power input coupler, a tuner, a low level RF system etc. This program also includes the SRF laboratory upgrade, which will permit the unit to be built and tested at IHEP. The unit will be used for the 1.3 GHz SRF system integration study, high power horizontal test and possible beam test in the future. In this paper, we report the recent R&D status of this program. The first large grain low-loss shape 9-cell superconducting RF cavity made by IHEP reached 20 MV/m in the first vertical test. The prototype tuner and LLRF system are under test. The first 1.3 GHz high power input coupler fabrication was finished and the cryomodule is under fabrication. Several key SRF facilities (CBP, CP, HPR, optical inspection camera, pretuning machine etc) for 9-cell cavity surface treatment and pre-tuning were successfully commissioned and in operation.

MOPO062	BEPCII Superconducting RF System Operation Status	247
	Y. Sun, J.P. Dai, T.M. Huang, H.Y. Lin, Y.P. Liu, G. Li, S.P. Li, Z.Q. Li, Q. Ma, W.M. Pan, F. Qiu, H. Qu, P. Sha, G.W. Wang, Q.Y. Wang, B. Xu, L.P. Yang, Y.L. Yu, M.C. Zhan, Z. Zhang IHEP Beijing, Beijing, People's Republic of China
	Two KEK-B type 500MHz Superconducting cavities have been used in BEPCII project since the end of 2006. All the maximum RF voltages have been over 1.65MV under the operation with beam power of 100 kW and beam current of 1.89GeV@800mA. During the physics collision mode operation, there is a strange phenomenon of helium gas pressure increasing with the beam current going up, which is dangerous to both cavity and cold box of cryogenics system. To search the unknown heating source, several beam tests had been made, which are HOMs power measurement, contrast of the RF power influence of coaxial coupler with Synchrotron Radiation opeation mode, and the beam synchrotron light influence in different beam orbits.
	Poster MOPO062 [0.286 MB]

TUPO052	Fabrication and Test of 500MHz Nb Cavity for BEPCII	512
	G.W. Wang, J.P. Dai, X.W. Dai, K. He, H.Y. Lin, Y.P. Liu, H. Li, S.P. Li, Z.Q. Li, Q. Ma, F. Meng, W.M. Pan, X.H. Peng, F. Qiu, P. Sha, Y. Sun, G.P. Wang, Q.Y. Wang, B. Xu, G.Y. Zhao IHEP Beijing, Beijing, People's Republic of China J.Z. Li, D.G. Liu AVIC Beijing Aeromautical Manufacturing Technology Research Institute, People's Republic of China
	In order to ensure the stable operation of BEPCII, we had began a superconducting accelerator unit in IHEP 3 years ago. The development and test of 500MHz Nb cavity, which is the key component of the unit, are introduced in this article. The fabrication of three Nb cavities has been finished, and the post-processing and vertical test of the 1st cavity have been completed, too. The technology of fabrication, electron beam welding (EBW), post-processing has been developed. Meanwhile, the related facilities has been improved, too.
	Poster TUPO052 [0.288 MB]