1.5GHz铌腔RF超导的实验研究
RF SUPERCONDUCTING EXPERIMENTS OF 1.5GHz Nb CAVITY
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摘要: 北京大学重离子所自1988年开始“超导腔”课题的研究工作,经过三年不懈努力获得了重大进展,受到国内外同行与专家的好评。本文详述了此课题的实验准备工作及低温超导物理实验过程,总结了RF(射频)超导实验技术、微波及锁相测量技术、腔体的后处理技术、计算机模拟设计及计算机控制、数据获取与处理等有关工作的进展和成果。目前,1.5GHz铌腔在CW模式的低温超导实验中获得了8.6MV/m(Qo=6.5×108)的加速梯度,并在2K温度时,测得Qo=8×109,这些实验结果达到了当前国际上的先进水平。Abstract: The project of RF superconducting cavities have been started at Peking University since 1988 and the progress has been obtained. The peparation and procedure for RF super-conducting experiments at low temperature are described in detail. RF superconducting experiments, microwave measurements, phase lock technique, the surface treatment of cavity, computer simulation for cavity design, control, data acquire and processing with computer are summaried. So far, an accelerating field of 8.6MV/m was abtained with CW mode and Q0 of 6.5×108, 2.25K.
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Key words:
- RF superconductivity /
- Nb cavity /
- cryostat /
- postpurification /
- phase lock technique
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