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A 3+1/2cell DC-SC photo-injector for PKU-FEL facility is under development,which is an up- grade design of the successful 1+1/2cell DC-SC photo-injector.The Lorentz detuning and tuning structure for the 3+1/2cell superconducting cavity is presented in this paper.The Lorentz force detuning coefficient is 1.2 Hz/(MV/m)~2 with double stiffening rings for the half cell and single stiffening rings between the adjacent TESLA cells.With the special stiffening structure,the 3+1/2cell whole cavity needs only one tuner.The influences of the tuning on frequency shift,field flatness and average gradient are discussed in this paper.The simulation results show that the stiffening rings’ design is successful.
A 3 + 1 / 2cell DC-SC photo-injector for PKU-FEL facility is under development, which is an up-grade design of the successful 1 + 1 / 2cell DC- SC photo-injector.The Lorentz detuning and tuning structure for the 3 + 1 / 2cell superconducting cavity is presented in this paper. Lorentz force detuning coefficient is 1.2 Hz / (MV / m) ~ 2 with double stiffening rings for the half cell and single stiffening rings between the adjacent TESLA cells .With the the stiffening structure, the 3 + 1 / 2cell whole cavity needs only one tuner. these influences of the tuning on frequency shift, field flatness and average gradient are discussed in this paper. the simulation results show that the stiffening rings’ design is successful.