远红外100μmFEL自发辐射谱的实验

Design of Testing System for ABS Test-bed

在FEL实验中,电子束通过摇摆器,一方面由于周期性磁场作用,电子束轨迹要周期性的摆动,另一方面还要辐射同FEL辐射波长一致的自发辐射,该辐射谱反映电子束、摇摆器集成后的参数.在CAE P远红外100μmFEL实验中,自发辐射谱是通过Ge:Ga低温探头和远红外100μm光栅谱仪测量,这里侧重从实际摇摆器磁场分析远红外100μmFEL的自发辐射谱.

In the FEL experiment ,when electron beam passes through the wiggler, because of the periodical magnet field, the movement of electron beam will be changed to wiggle in the wiggler. Meanwhile electron beam will spontaneously emit the radiation whose wavelength is similiar with the FEL radiation. This radiation is influenced by the parameters of both the electron beam and the wiggler. The gain of FEL is determined by the spontaneous emission spectrometer, and the spectrum width mainly determined by the periods of wiggler and electron energy homogeneity （△E/E） . According to the measured parameters of electron beam and the wiggler , the spontaneous emission is studied. In the experiment, the spectrum of the spotaneous emission is measured by Far-Infra-Red 100μm spectrometer, together with Ge： Ga detector.