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A totally home-made 9-cell TESLA type superconducting cavity is mane at Peking University. The cavity abrication is according to DESY specification. The cavity is made of high purity niobium from OTIC, Ningxia. The electron beam welding is carried out at Harbin Institute of Technology, Harbin. By the cooperation, the cavity is tested at Thomas Jefferson National Accelerator Facility, USA. The preliminary result shows the acceleration gradient Eacc is 23 MV/m without quench and has potential for improvement. 相似文献
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Tuning for the first 9-cell TESLA cavity of PKU 总被引:1,自引:0,他引:1
A method based on circuit model is used to tune the first home-made 9-cell TESLA type superconducting niobium cavity at Peking University. After tuning, a flat field profile with a final π-mode frequency within 3 kHz of target frequency is achieved. The field flatness is measured by a bead-pull method, and the relative electric field is calculated from the frequency shift perturbed by the bead stepping along the axis of the cavity. 相似文献
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The RF performance of a 1.3 GHz 9-cell superconducting niobium cavity was evaluated at cryogenic temperatures following surface processing by using the standard ILC-style recipe. The cavity is a TESLA-style 9-cell superconducting niobium cavity, with complete end group components including a higher order mode coupler, built in China for practical applications. An accelerating gradient of 28.6 MV/m was achieved at an unloaded quality factor of 4×109. The morphological property of mechanical features on the RF surface of this cavity was characterized through optical inspection. Correlation between the observed mechanical features and the RF performance of the cavity is attempted. 相似文献
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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. 相似文献
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为了保证9-cell超导加速腔在场的平滑度、TM010模的频率以及加速器的总长度达到TESLA国际标准, 必须确保每个Dumb-Bell在以上各方面达到标准要求. 由于冲压、机加工以及电子束焊接等过程会引起形变, 因此, 必须在完成iris和加强筋的电子束焊接之后对Dumb-Bells进行微波和机械测量, 并根据测量的结果对其腔形和长度等作必要的调整. 北京大学已经建立了一套完整的测量和调整Dumb-Bells的装置, 本文深入研究了Dumb-Bells的测量与调整的方法. 相似文献