总结了在神光Ⅲ原型激光装置上开展的一系列黑腔物理实验研究, 从多个方面研究了黑腔内部等离子体状态和辐射场特性。用真空黑腔能量学研究获得了散射光、辐射温度和不同能段辐射流份额的定标规律, 从能量学角度梳理和分析了整个激光黑腔相互作用过程。通过对黑腔中充入低密度低Z气体抑制了腔壁等离子体运动, 明显减少了可能造成靶丸预热的金M带辐射流(1.6~4.4 keV)份额。针对黑腔内部不同区域等离子体, 研究了光斑区等离子体的运动, 分析了其与电子热传导限流因子的关系; 研究了冕区等离子体的运动, 分析了不同充气等离子体条件对其的影响; 在同一发次实验中同时测量了光斑区与再发射区的辐射流比值。

Hohlraum physics is fundamental to the indirect drive inertial fusion. The ultimate goal of laser-driven hohlraum is to create a radiation environment that ablatively implodes a capsule to ignite and burn. To obtain high fusion yield with minimum laser energy, the hohlraum radiation drive must meet both the high X-ray conversion and excellent uniformity. By optimizing the hohlraum structures and materials, the hohlraum performance could be improved in flux intensity, uniformity and spectrum. The hohlraum physics study focuses on the laser propagation through the underdense plasma, x-ray conversion by the laser interacting with the high-Z material and X-ray heating of high-Z walls. All of these issues are important for understanding the hohlraum. On the Shenguang-Ⅲ prototype laser facility, extensive experiments have been performed to characterize laser-heated hohlraum. We have demonstrated good understanding of the hohlraum energetics and radiation feature. Experimental study on vacuum hohlraum energetics obtains the scaling of the scattered light and radiation temperature with laser energy and hohlraum size. Gas-filled hohlraum impedes the motion of ablated wall plasma with the low-density, low-Z gas plasma, and exhibits a reduction of Au M-band flux that might adversely preheat the capsule. Several quantitative studies that concentrate on the specific regions inside the hohlraum have been performed. The laser spot movement with different flux limiter according to electron heat conduction has been investigated. The movement of laser heated corona plasma could be controlled by varying initial gas density. The ratio of the X-ray emission between the laser spot and the reemitting wall was measured in the same shot, which might contribute to the optimization of the hohlraum flux symmetry.