Multi-keV X-Ray Source Development Experiments on the National Ignition Facility
Multi-keV X-Ray Source Development Experiments on the National Ignition Facility
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DOI：
10.1063/1.3458904
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发表时间：
2010-08
影响因子：
2.2
通讯作者：
K. Fournier;M. May;J. Colvin;J. Kane;M. Schneider;E. Dewald;C. Thomas;S. Compton;R. Marrs;J. Moody;E. Bond;P. Michel;J. Fisher;C. Newlander;J. Davis
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文献类型：
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作者：
K. Fournier;M. May;J. Colvin;J. Kane;M. Schneider;E. Dewald;C. Thomas;S. Compton;R. Marrs;J. Moody;E. Bond;P. Michel;J. Fisher;C. Newlander;J. Davis
我们报告的结果，从一个五杆运动进行了Ar-氩气填充的目标在国家点火设施（NIF）。用5 ns梯形激光脉冲传递的1.350kJ的3ω激光能量射击靶。我们报告了在低于和高于1.5 keV光子能量的不同光谱带中从目标测量的X射线输出：我们发现在所有能量上具有接近4 TW/sr的峰值X射线功率的产额为20.5 kJ/sr，如针对我们的探测器的独特视角测量的，并且对于能量>3 keV的X射线，具有1 TW/sr的峰值X射线功率的产额为3.6 kJ/sr。对于能量>3 keV的各向同性X射线，激光到X射线的转换效率为13±1.3%。测量了内锥和外锥光束被靶等离子体反射的激光能量，发现反射的激光能量很小，在驱动能量的1%和4%之间。测量了硬X射线（能量>25 keV）中发射的能量，发现其为1001 J/sr。在激光脉冲过程中靶等离子体的二维成像证实了一种快速、体积小的等离子体。
We report results from a five shot campaign carried out with Ar–Xe gas-filled targets at the National Ignition Facility (NIF). The targets were shot with ≈350 kJ of 3ω laser energy delivered with a 5 ns trapezoidal laser pulse. We report measured x-ray output from the target in different spectral bands both below and above 1.5 keV photon energies: We find yields of ≈20.5 kJ/sr with peak x-ray power approaching 4 TW/sr over all energies, as measured for the unique viewing angle of our detector, and ≈3.6 kJ/sr with peak x-ray power of 1 TW/sr for x-rays with energies >3 keV. This is a laser-to-x-ray conversion efficiency of 13±1.3% for isotropic x-rays with energies >3 keV. Laser energy reflected by the target plasma for both inner and outer-cone beams is measured and found to be small, between 1% and 4% of the drive energy. The energy emitted in hard x-rays (with energies >25 keV) is measured and found to be ≈1 J/sr. Two-dimensional imaging of the target plasma during the laser pulse confirms a fast, volum...