1 January 2001 Thermal-recovery optimization of SG-III prototype
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Optical Engineering, 40(1), (2001). doi:10.1117/1.1327502
Abstract
Thermal recovery of the main amplifier of the SG-III prototype is numerically simulated. The calculations indicate that, with a shot period of 4 h, we can achieve an acceptable laser slab average temperature and thermal gradient across the slab aperture through optimized active cooling for both the flashlamp cassettes and the slab cavities. After 4 h of thermal recovery, the average temperature and the largest temperature drop across the aperture of the laser slab will be less than 0.13°C above ambient and 0.11°C respectively. The active cooling for all the flashlamp cassettes will need a total cleaned-air flow rate of 80 m3/min (10 ft3/min per lamp) and a total nitrogen flow rate of 16 m3/min for all the slab cavities. Additionally, the temperature of the cooling gas in the flashlamp cassette must be reduced to ?1.0°C (relative to ambient temperature) during the first 2.5 h of the thermal recovery cycle.
Haiwu Yu, Wanguo Zheng, Chengcheng Wang, Shaobo He, Jun Tang, Yong Liu, Yu Yongmei Chun, "Thermal-recovery optimization of SG-III prototype," Optical Engineering 40(1), (1 January 2001). http://dx.doi.org/10.1117/1.1327502
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KEYWORDS
Optical amplifiers

Nitrogen

Adaptive optics

Distortion

National Ignition Facility

Prototyping

Wavefront distortions

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