石英玻璃低能质子辐照损伤动力学研究

Damage Kinetics of Quartz Glass under Proton Radiation with Low Energy

地面模拟研究了 JGS3光学石英玻璃在真空、热沉和能量低于200 keV的低能质子辐照下表面光学性能变化的基本规律,并建立了辐照损伤色心演化的动力学唯象模型。试验结果表明,大通量低能质子辐照对石英玻璃表层具有明显的表面损伤效应。随着辐照吸收剂量的增加,光密度变化先以线性规律迅速增加,加进一步增加时逐渐呈现饱和趋势;采用较高能量辐照作用后光密度变化出现饱和趋势的拐点提前,且饱和数值降低。根据对试验结果的分析,建立了低能质子辐照下石英玻璃色心演化的动力学模型,并给出了光密度变化的表达式。采用模型结果进行数学模拟,模拟曲线与试验结果曲线相似。因此所建立的动力学模型可以用来定量描述低能质子辐照下石英玻璃光学性能随辐照吸收剂量的变化规律。

Under ground simulation for the space environment of high vacuum, heat sink and low energy protons with less than 200 keV, the change in optical transmittance of JGS3 optical quartz glass was studied, and the kinetic model for the evolution of color centers in the process of radiation damage was set up. The experimental results show that radiation damage effects obviously occur on the surface layer of quartz glass under large flux and low energy proton radiation. The optical density change increases rapidly and then a saturation trend appears with further increasing absorption dose; and the appearance of saturation inflexion is advanced and its value decreases using higher radiation energy. By analyzing experimental results, a kinetic model for the evolution of color centers in quartz glass irradiated with protons is proposed, and the change in optical density can be given. The experimental results are mathematically fitting with the function deduced from the model. The mathematical fitted curve is similar to experimental ones. It is believed that the proposed kinetic model can be used in the quantitative description for the change in optical property of quartz glass with increasing absorption dose under proton radiation with low energy.