Lorentz detuning and tuning system study of 3+1/2cell DC-SC photo-injector for PKU-FEL

XU Wen-Can; QUAN Sheng-Wen; ZHAO Kui; ZHU Feng

doi:10.1088/1674-1137/32/3/011

Chinese Physics C> 2008, Vol. 32> Issue(3) : 215-217 DOI: 10.1088/1674-1137/32/3/011

Lorentz detuning and tuning system study of 3+1/2cell DC-SC photo-injector for PKU-FEL

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Abstract：
A 3+1/2cell DC-SC photo-injector for PKU-FEL facility is under development，which is an upgrade 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 1.2Hz/(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.

References

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XU Wen-Can, QUAN Sheng-Wen, ZHAO Kui and ZHU Feng. Lorentz detuning and tuning system study of 3+1/2cell DC-SC photo-injector for PKU-FEL[J]. Chinese Physics C, 2008, 32(3): 215-217. doi: 10.1088/1674-1137/32/3/011

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Received: 2007-04-03
Revised: 2007-05-10

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沈阳化工大学材料科学与工程学院沈阳 110142

Lorentz detuning and tuning system study of 3+1/2cell DC-SC photo-injector for PKU-FEL

Corresponding author: XU Wen-Can,

Received Date: 2007-04-03
Accepted Date: 2007-05-10
Available Online: 2008-03-05

Abstract:

A 3+1/2cell DC-SC photo-injector for PKU-FEL facility is under development，which is an upgrade 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 1.2Hz/(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.