太赫兹自由电子装置注入束流输运线的束团有着较长的尾部。在束团尾部能散较大的粒子由输运线中的能量狭缝加以剔除,仅保留头部满足出光要求的粒子输入波荡器。利用Elegant的模拟计算表明在目前采用的输运线设计可以将束团有效部分的粒...太赫兹自由电子装置注入束流输运线的束团有着较长的尾部。在束团尾部能散较大的粒子由输运线中的能量狭缝加以剔除,仅保留头部满足出光要求的粒子输入波荡器。利用Elegant的模拟计算表明在目前采用的输运线设计可以将束团有效部分的粒子完整地传输至波荡器。输运线所采用的磁铁的加工和安装误差会导致束流轨道的畸变,需要利用校正磁铁对束流的偏移加以校正。利用AT for MATLAB仿真计算结果表明,合理选择校正线圈的布局可以有效地校正束流偏差。展开更多
The laser wire （LW） method has been demonstrated to be an effective non-interceptive technique for measuring transverse profile and emittance of electron beams in colliders, storage rings and dumping rings. In this ...The laser wire （LW） method has been demonstrated to be an effective non-interceptive technique for measuring transverse profile and emittance of electron beams in colliders, storage rings and dumping rings. In this paper, we present an improved design of high repetition LW system for high average power free electron lasers （HAP FELs） and energy recovery linacs （ERLs）. This improved LW utilizes the excess power of the photocathode drive laser, thus making itself much cheaper and simpler. The system main parameters are optimized with numerical calculations and Monte Carlo simulations, indicating that resolutions would be better than 100 ~m and scanning time less than 1 minute. Status of the experiment preparation is also presented.展开更多
Peking University is developing a 1.3 GHz superconducting accelerating section highpower THz free- electron laser for the China Academy of Engineering Physics （CAEP）. A compact fast/slow tuner has been developed by ...Peking University is developing a 1.3 GHz superconducting accelerating section highpower THz free- electron laser for the China Academy of Engineering Physics （CAEP）. A compact fast/slow tuner has been developed by the Institute of High Energy Physics （IHEP） for the accelerating section to control Lorentz detuning, compensate for beam loading effect, microphonics and liquid helium pressure fluctuations. The tuner design, warm test and cold test of the first prototype are presented, which has a guiding significance for the manufazture of the formal tuner and cryomodule assembly.展开更多
On the basis of an energy-recovery linac, a terahertz source with a potential for kilowatts of average power is proposed in Shanghai, which will serve as an effective tool for material and biological sciences. In this...On the basis of an energy-recovery linac, a terahertz source with a potential for kilowatts of average power is proposed in Shanghai, which will serve as an effective tool for material and biological sciences. In this paper, the physical design of two free electron laser （FEL） oscillators, in a frequency range of 2-10 THz and 0.5-2 THz respectively, are presented. By using three-dimensional, time-dependent numerical modeling of GENESIS in combination with a paraxial optical propagation code, the THz oscillator performance, the detuning effects, and the tolerance requirements on the electron beam, the undulator field and the cavity alignment are given.展开更多
文摘太赫兹自由电子装置注入束流输运线的束团有着较长的尾部。在束团尾部能散较大的粒子由输运线中的能量狭缝加以剔除,仅保留头部满足出光要求的粒子输入波荡器。利用Elegant的模拟计算表明在目前采用的输运线设计可以将束团有效部分的粒子完整地传输至波荡器。输运线所采用的磁铁的加工和安装误差会导致束流轨道的畸变,需要利用校正磁铁对束流的偏移加以校正。利用AT for MATLAB仿真计算结果表明,合理选择校正线圈的布局可以有效地校正束流偏差。
文摘The laser wire （LW） method has been demonstrated to be an effective non-interceptive technique for measuring transverse profile and emittance of electron beams in colliders, storage rings and dumping rings. In this paper, we present an improved design of high repetition LW system for high average power free electron lasers （HAP FELs） and energy recovery linacs （ERLs）. This improved LW utilizes the excess power of the photocathode drive laser, thus making itself much cheaper and simpler. The system main parameters are optimized with numerical calculations and Monte Carlo simulations, indicating that resolutions would be better than 100 ~m and scanning time less than 1 minute. Status of the experiment preparation is also presented.
基金Supported by the 500 MHz superconducting cavity electromechanical tuning system(Y190KFEOHD)NSAF(11176003)National Major Scientific Instrument and Equipment Development projects(2011YQ130018)
文摘Peking University is developing a 1.3 GHz superconducting accelerating section highpower THz free- electron laser for the China Academy of Engineering Physics （CAEP）. A compact fast/slow tuner has been developed by the Institute of High Energy Physics （IHEP） for the accelerating section to control Lorentz detuning, compensate for beam loading effect, microphonics and liquid helium pressure fluctuations. The tuner design, warm test and cold test of the first prototype are presented, which has a guiding significance for the manufazture of the formal tuner and cryomodule assembly.
基金Supported by Natural Science Foundation of China (11175240)
文摘On the basis of an energy-recovery linac, a terahertz source with a potential for kilowatts of average power is proposed in Shanghai, which will serve as an effective tool for material and biological sciences. In this paper, the physical design of two free electron laser （FEL） oscillators, in a frequency range of 2-10 THz and 0.5-2 THz respectively, are presented. By using three-dimensional, time-dependent numerical modeling of GENESIS in combination with a paraxial optical propagation code, the THz oscillator performance, the detuning effects, and the tolerance requirements on the electron beam, the undulator field and the cavity alignment are given.
