Energy spectral response of photocathode for soft X-ray streak camera
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摘要: 通过对条纹相机光阴极在光电转换过程中光电子产生过程的分析，推导了光阴极在软X射线波段的能谱响应灵敏度计算公式，并运用该公式探讨了阴极厚度、掠入射角度等参数对能谱响应灵敏度的影响，计算并分析了Au，CsI在0.1~10 keV范围内的能谱响应曲线和特性，并利用标定试验数据对共识和模型的可靠性进行了验证。结果表明，CsI阴极的最佳厚度在60 nm左右，Au阴极的最佳厚度在10 nm左右；CsI阴极的能谱响应灵敏度比Au阴极高1~2量级。Abstract: Based on the analysis of production process of the photoelectron of the streak camera photocathode during the photoemission, the formula of photocathode energy spectral response was obtained in the region of 0.1-10 keV. The effects of photocathode parameters on spectral response were discussed. Based on the model, energy spectral response curves of Au photocathode and CsI photocathode were obtained and analyzed. And the reliability of the formula was validated by the calibrated data. The results indicate that the best thicknesses of CsI and Au photocathodes are 60 nm and 10 nm. The energy spectral response of CsI is 1 to 2 orders higher than that of Au.
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Key words:
- streak camera /
- soft X-ray /
- photocathode /
- secondary electron /
- energy spectral response
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