排序方式: 共有19条查询结果,搜索用时 15 毫秒
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The Duke storage ring is a dedicated driver for the storage ring based oscillator free-electron lasers(FELs), and the High Intensity Gamma-ray Source(HIGS). It is operated with a beam current ranging from about1 mA to 100 mA per bunch for various operations and accelerator physics studies. High performance operations of the FEL and γ-ray source require a stable electron beam orbit, which has been realized by the global orbit feedback system. As a critical part of the orbit feedback system, the electron beam position monitors(BPMs) are required to be able to precisely measure the electron beam orbit in a wide range of the single-bunch current. However, the high peak voltage of the BPM pickups associated with high single-bunch current degrades the performance of the BPM electronics, and can potentially damage the BPM electronics. A signal conditioning method using low pass filters is developed to reduce the peak voltage to protect the BPM electronics, and to make the BPMs capable of working with a wide range of single-bunch current. Simulations and electron beam based tests are performed. The results show that the Duke storage ring BPM system is capable of providing precise orbit measurements to ensure highly stable FEL and HIGS operations. 相似文献
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为推动北京大学超导加速器实验装置不断向强流目标迈进,提出100 W红外高重频光阴极驱动激光的设计方案,主放大器采用先进的光子晶体增益光纤,保证输出光束的质量。对激光系统中的关键问题,如各部分功率指标、脉冲展宽和压缩、激光耦合等进行了设计,并且考虑了激光的非线性影响。为实现强流加速器开机运行所必备的诊断模式,也提出了对于高重频激光进行两级选频的独特设计方案。将高速的SOA光开关和低速的声光调制器相结合,产生宏脉冲结构的输出激光,从而实现加速器在诊断模式下的运行。 相似文献
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射频超导谐振腔以其优越性在加速器领域起到了常温加速腔无法替代的作用. 超导腔的表面 特性直接影响到加速腔的性能. 为进一步提高超导腔的加速性能,北京大学利用超高真空氩 离子清洗技术发展了一种超导腔表面的干式处理方法. 与传统的湿处理方法(化学抛光BCP和 电抛光EP)相比,干式处理方法具有其特有的优点,有可能成为一种新的超导腔表面处理方 法,对提高加速腔的性能起到推动作用. 进一步的研究正在进行之中.
关键词:
射频超导
表面处理
溅射
抛光 相似文献
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In order to improve the precision of the laser–radio-frequency(RF) synchronization system from sub-picosecond to femtosecond(fs), a synchronization system between a picosecond laser and a 1.3 GHz RF generator has been developed based on a fiber-loop optical-microwave phase detector(FLOM-PD). Synchronization with fs-level(3.8 fs) rms jitter, integrated from 10 Hz to 1 MHz, is achieved for the first time, to the best of our knowledge, in this kind of configuration. This system will be used for the superconducting RF accelerator at Peking University. 相似文献
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The Duke storage ring is a dedicated driver for the storage ring based oscillator free-electron lasers(FELs), and the High Intensity Gamma-ray Source(HIGS). It is operated with a beam current ranging from about1 mA to 100 mA per bunch for various operations and accelerator physics studies. High performance operations of the FEL and γ-ray source require a stable electron beam orbit, which has been realized by the global orbit feedback system. As a critical part of the orbit feedback system, the electron beam position monitors(BPMs) are required to be able to precisely measure the electron beam orbit in a wide range of the single-bunch current. However, the high peak voltage of the BPM pickups associated with high single-bunch current degrades the performance of the BPM electronics, and can potentially damage the BPM electronics. A signal conditioning method using low pass filters is developed to reduce the peak voltage to protect the BPM electronics, and to make the BPMs capable of working with a wide range of single-bunch current. Simulations and electron beam based tests are performed. The results show that the Duke storage ring BPM system is capable of providing precise orbit measurements to ensure highly stable FEL and HIGS operations. 相似文献