Design of a third harmonic Landau cavity for the SRRC storage ring

Authors
Wang, Ch.
Synchrotron Radiat. Res. Center, Hsinchu, Taiwan
Chang, L.H. ; Yang, T.T. ; Tzeng, R.H. ; Lin, M.C. ; Lau, W.K. ; Kuo, C.C.

Abstract
We present here our design of the SRRC third-harmonic Landau cavity to be operated on the first stage in a passive mode for bunch lengthening so as to increase the Touschek life-time. Its implementation will also be helpful for suppression of the longitudinal coupled-bunch instabilities observed in the storage ring of SRRC. The cavity profile was optimized with the 2D code URMEL with the following criteria: (1) maximization of the shunt impedance; (2) minimization of the maximal power flow density on the cavity surface; (3) feasibility of the mechanical constructions. A prototype is now under construction.

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