关于wiggler长波自发辐射的理论分析与数值计算  

Theoretical analysis and numerical calculation of long wavelength radiation from wiggler

作　　者：李煜辉[1] 贾启卡[1] 

机构地区：[1]中国科学技术大学国家同步辐射实验室,合肥230029

出　　处：《物理学报》2005年第8期3584-3590,共7页Acta Physica Sinica

摘　　要：电子通过wiggler产生的辐射,除了短波辐射在轴线附近也有较强的长波辐射,在与轴线夹角1/γ处达到最大.推导出wiggler长波辐射公式,理论分析了这种辐射的特点,并且将理论分析的结果与数值计算的结果进行了比较.对在红外波长范围内电子束通过弯转磁铁和wiggler时产生的辐射强度和光通量作了计算,结果表明wiggler下的辐射强度和光通量均强于弯转磁铁.比较了弯转磁铁的边沿辐射、波荡器的渡越辐射和wiggler长波辐射,表明wiggler在红外波长范围辐射的性能最优.Wiggler radiation contains not only the usual component with short wavelength radiation but also a broadband component in the long wavelength region, which emits in the near forward direction, peaked at an angle 1/gamma. Firstly, spontaneous radiation from a wiggler is analyzed based on the basic formula of electrodynamics. With the long wavelength approximation, a formula for the long wavelength is obtained. The theoretical result is well coincided with the result of numerical calculation. Also the character of this radiation is analyzed. Secondly, the photon fluxes coming separately from the wiggler and a bending magnet are compared, for the wavelength longer than 1 mu m. The result shows the superiority of wiggler radiation in the infrared region. Finally, the long wavelength radiation from the wiggler is compared with the undulator transition radiation and the bending magnetic edge emission. The result shows that long wavelength radiation from the wiggler is the strongest one.

关 键 词：WIGGLER 数值计算 自发辐射 长波辐射 辐射强度 波长范围 短波辐射 辐射公式 轴线夹角 渡越辐射 光通量 磁铁 电子束 波荡器 红外 

分 类 号：TN21[电子电信—物理电子学]