波荡器谐波场增强效应对电子自发辐射谱的影响
Effects of undulator harmonic field enhancement on electron beam spontaneous radiation
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摘要: 有效利用电子束在波荡器中运动时产生的谐波辐射，是获得更短波长辐射最直接的方法之一。提高波荡器磁场的谐波分量可以提高电子束的谐波辐射光场强度。分析了一种改进Halbach型波荡器结构，计算了其磁场的构成，分析表明这种结构可以使磁场的三次谐波分量提高至基波分量的25%左右。以合肥光源的电子束参数为例，计算了波荡器磁场谐波分量增强后对电子束自发辐射谱的影响。计算结果表明，波荡器磁场谐波分量增强至25%时,可以使电子束自发辐射的三次谐波辐射增强至基波辐射光子通量的67%左右。Abstract: Making good use of harmonic radiation field is one of the most straight forward methods to generate radiation at short wavelength. The enhancement of undulator harmonic magnetic field could increase the radiation intensity at the harmonic wavelength. A modified Halbach undulator was analyzed, and its magnetic contents were computed. The analysis shows that the modified Halbach undulator could improve the third harmonic magnetic field to 25% of the fundamental. The effect of the enhanced harmonic magnetic field on the spontaneous radiation spectrum was analyzed using the electron beam parameters in Hefei Light Source. The analysis shows that when the third harmonic magnetic field is improved to 25% of the fundamental in the modified Halbach undulator, the photon flux at the third harmonic o
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Key words:
- undulator /
- harmonic magnetic field /
- spontaneous radiation /
- harmonic radiation /
- radiation spectrum
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