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29 January 2007 Beam-smoothing investigation on Heaven I
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Proceedings Volume 6279, 27th International Congress on High-Speed Photography and Photonics; 62795Z (2007)
Event: 27th International congress on High-Speed Photography and Photonics, 2006, Xi'an, China
Directly driven targets for inertial confinement fusion (ICF) require laser beams with extremely smooth irradiance profiles to prevent hydrodynamic instabilities that destroy the spherical symmetry of the target during implosion. Such instabilities can break up and mix together the target's wall and fuel material, preventing it from reaching the density and temperature required for fusion ignition.1,2 Measurements in the equation of state (EOS) experiments require laser beams with flat-roofed profiles to generate uniform shockwave3. Some method for beam smooth, is thus needed. A technique called echelon-free induced spatial incoherence (EFISI) is proposed for producing smooth target beam profiles with large KrF lasers. The idea is basically an image projection technique that projects the desired time-averaged spatial profile onto the target via the laser system, using partially coherent broadband lighe. Utilize the technique, we developing beam- smoothing investigation on "Heaven I". At China Institute of Atomic Energy , a new angular multiplexing providing with beam-smoothing function has been developed, the total energy is 158J, the stability of energy is 4%, the pulse duration is 25ns, the effective diameter of focusing spot is 400um, and the ununiformity is about 1.6%, the power density on the target is about 3.7×1012W/cm2. At present, the system have provided steady and smooth laser irradiation for EOS experiments.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yi-huai Xiang, Zhi-xing Gao, Xiao-hui Tong, Hui Dai, Xiu-zhang Tang, and Yu-sheng Shan "Beam-smoothing investigation on Heaven I", Proc. SPIE 6279, 27th International Congress on High-Speed Photography and Photonics, 62795Z (29 January 2007);


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