激光间接驱动冲击波实验测量
Experimental measurement of indirectly driven shock waves with laser
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摘要: 在神光Ⅱ高功率激光装置上，利用光学条纹相机观测台阶靶背面的冲击波加热发光，对样品中冲击波的平面性和冲击波速度进行了测量。通过冲击波法测得的腔内辐射温度与软X光能谱仪的测量结果一致，验证了冲击波速度测量的可信度。实验结果表明：在8路能量各为260 J、波长为351 nm的激光注入腔靶时，激光间接驱动的冲击波阵面在288 mm范围内平面性较好，Al样品中的冲击波速度为3.15×106 cm/s，对应的冲击波压力为1.66×1012 Pa。Abstract: On the Shenguang-Ⅱ high power laser facility, temporal- and spatial-resolved experimental records of light emitting from heating luminescence at the rear surface of step samples were obtained by an optical streak camera. The velocity and planarity of the shock wave were measured. The radiation temperature measured by soft X-ray spectrometer was consistent with the result by optical streak camera. The results indicated that the radiation temperature was about 160 eV in a high Z cylindrical hohlraum which was irradiated by eight laser pulses with 260 J energy each, the length of the shock wave with a better planarity was 288 mm, the velocity was 3.15×106 cm/s and the pressure of the shock wave was 1.66×1012 Pa.
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Key words:
- shock wave /
- equation of state /
- planarity /
- radiation temperature /
- hohlraum target
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