质子辐照对极紫外波段滤光片透过率的影响
Effect of proton irradiation on transmittance of Al filter at EUV waveband
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摘要: 为了检验应用在极紫外波段空间太阳望远镜上Al滤光片在空间辐照环境下透过率的变化情况，用能量100 keV，剂量为6×1011/mm2的质子束对其进行辐照，利用透射电子显微镜分析了质子辐照前后滤光片的微观结构。实验结果表明:由于质子辐照使滤光片受质子侵蚀后，Al原子被击出发生质量损失，表面形态发生了变化，造成滤光片变薄，从而导致透过率由辐照前的12.1%增大到15.0%，且滤光片的薄厚分布不均匀使透过率曲线出现了次级峰，造成其光学性能的退化。Abstract: Part of low-earth orbit’s space radiation environment was simulated to investigate the influence on the transmittance change of the aluminum filter used on the space solar telescope in extreme-ultraviolet(EUV) waveband. The transmittance was measured before and after proton irradiation with energy of 100 keV and dose of 6×1011/mm2. And the microstructures of aluminum filter were investigated by transmission electron microscopy(TEM). The experimental results show that the transmittance of filter increases from 12.1% to 15.0% because of the thickness decrease of filter after proton irradiation, and the thickness of the filter beoames inhomogeneous, resulting in the optical performance degradation of the filter and sub-peak in the transmittance curve. The reason is tha
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Key words:
- proton irradiation /
- filter /
- transmittance /
- extreme-ultraviolet waveband
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