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- 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
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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.
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