Gain degeneration and maintance project of 400 mm aperture disk amplifier
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摘要: 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、3 000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。Abstract: One of the main problems occur during inertial confinement fusion (ICF) laser facility’s long-term operation is the gain degeneration of the 400 mm aperture slab amplifier,which will affect the output of the facility and the laser beam quality. A study on gain degeneration causing by several factors was carried out and a normalization theory model from all the factors has been built. The test was accomplished on two groups of 400 mm aperture, 4×2 composition multi-segment slab amplifier with each group includes 9 slabs. The gain degenerating rate was about 10.2% after 10 years, 3 000 shots of work which is in accordance with the theoretical predication. A maintance project for the large aperture slab amplifier has been drawn up to keep the gain degeneration less than 1.5% during long-term operation of the ICF facility.
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Key words:
- inertial confinement fusion /
- slab amplifier /
- gain degenerate /
- maintance
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图 1 ICF激光装置及400 mm口径片状放大器示意图
Figure 1. Schematic of the ICF laser facility and the amplifier
图 2 大口径片状放大器增益储能能量传递转换过程
Figure 2. The pass of energy of large aperture slab amplifier
图 5 小信号增益系数与电容器储能值下降的关系
Figure 5. Relationship of small signal gain coefficient and bank energy change
表 1 氙灯电光转换效率随发次变化
Table 1. Change of flashlamp electro-optical conversion efficiency with shots
flashlamp
issueinitial
efficiency/%efficiency after
3000 shots/%drop
rate/%1，2 79.21 77.51 −2.13 3，4 79.02 77.67 −1.68 5，6 81.11 79.61 −1.85 7，8 79.68 78.81 −1.13 
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