400 mm口径片状放大器增益性能退化研究及维护策略

Gain degeneration and maintance project of 400 mm aperture disk amplifier

400 mm口径片状放大器增益性能退化是国内外惯性约束聚变(ICF)激光装置长期运行所面临的主要问题之一,直接影响激光装置的输出能力与光束质量。对造成片状放大器增益退化的因素开展了分析,建立了各因素的归一化理论分析模型,并利用2组九片长的400 mm口径4×2组合式片状放大器系统开展了实验研究,无维护策略条件下经过10年、3000发次运行后增益性能平均退化了10.2%,符合理论预期。以此制定了大口径片状放大器的维护策略,实现了系统长期的增益性能退化率优于1.5%,满足ICF激光装置长期运行要求。

One of the main problems occur during inertial confinement fusion(ICF)laser facility’s long-termoperation is the gain degeneration of the 400 mm aperture slab amplifier,which will affect the output of the facility andthe laser beam quality.A study on gain degeneration causing by several factors was carried out and a normalizationtheory model from all the factors has been built.The test was accomplished on two groups of 400 mm aperture,4×2composition multi-segment slab amplifier with each group includes 9 slabs.The gain degenerating rate was about10.2%after 10 years,3000 shots of work which is in accordance with the theoretical predication.A maintance projectfor the large aperture slab amplifier has been drawn up to keep the gain degeneration less than 1.5%during long-termoperation of the ICF facility.