A 3＋1/2cell DC-SC photo-injector for PKU-FEL facility is under development, which is an upgrade design of the successful 1-4-1/2cell DC-SC photo-injector. The Lorentz detuning and tuning structure for the 3＋1/2cell ...A 3＋1/2cell DC-SC photo-injector for PKU-FEL facility is under development, which is an upgrade design of the successful 1-4-1/2cell 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.展开更多
The superconducting spoke cavity has been proposed to accelerate the proton in the low energy section of the high power proton linac for the Accelerator Driven Sub-critical System in China. In this paper, the basic ge...The superconducting spoke cavity has been proposed to accelerate the proton in the low energy section of the high power proton linac for the Accelerator Driven Sub-critical System in China. In this paper, the basic geometric and RF parameters of a β=0.3, 352 MHz spoke cavity are given, and the Lorenz detuning and tuning are presented.展开更多
The taper-shaped superconducting quarter wave resonators with frequency of 80.5 MHz, β of 0.041 and 0.085 have been pre-researched. The radio frequency （RF） design of the cavities has been completed, and the struct...The taper-shaped superconducting quarter wave resonators with frequency of 80.5 MHz, β of 0.041 and 0.085 have been pre-researched. The radio frequency （RF） design of the cavities has been completed, and the structural design is also an important aspect which will be discussed in the following. The frequency shift caused by the etching effects of the surface treatment, the helium bath pressure and the Lorentz force, and the mechanical modes caused by the microphonic excitation have been anMyzed. The results show that the frequency variation from the Lorentz force is not serious and stiffening rings are explored aimed at decreasing the deformation brought by the helium pressure and microphonic excitation.展开更多
基金Supported by Major State Basic Research Development Program of China(2002CB713600)
文摘A 3＋1/2cell DC-SC photo-injector for PKU-FEL facility is under development, which is an upgrade design of the successful 1-4-1/2cell 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.
文摘The superconducting spoke cavity has been proposed to accelerate the proton in the low energy section of the high power proton linac for the Accelerator Driven Sub-critical System in China. In this paper, the basic geometric and RF parameters of a β=0.3, 352 MHz spoke cavity are given, and the Lorenz detuning and tuning are presented.
基金National Natural Science Foundation of China (91026001)
文摘The taper-shaped superconducting quarter wave resonators with frequency of 80.5 MHz, β of 0.041 and 0.085 have been pre-researched. The radio frequency （RF） design of the cavities has been completed, and the structural design is also an important aspect which will be discussed in the following. The frequency shift caused by the etching effects of the surface treatment, the helium bath pressure and the Lorentz force, and the mechanical modes caused by the microphonic excitation have been anMyzed. The results show that the frequency variation from the Lorentz force is not serious and stiffening rings are explored aimed at decreasing the deformation brought by the helium pressure and microphonic excitation.
