在 OMEGA 激光上产生千兆巴球形冲击波。
Gigabar spherical shock generation on the OMEGA laser.
机构信息
Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623, USA and Fusion Science Center, University of Rochester, Rochester, New York 14623, USA and Department of Physics and Astronomy and/or Mechanical Engineering, University of Rochester, Rochester, New York 14623, USA.
Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623, USA.
出版信息
Phys Rev Lett. 2015 Jan 30;114(4):045001. doi: 10.1103/PhysRevLett.114.045001. Epub 2015 Jan 27.
This Letter presents the first experimental demonstration of the capability to launch shocks of several-hundred Mbar in spherical targets--a milestone for shock ignition [R. Betti et al., Phys. Rev. Lett. 98, 155001 (2007)]. Using the temporal delay between the launching of the strong shock at the outer surface of the spherical target and the time when the shock converges at the center, the shock-launching pressure can be inferred using radiation-hydrodynamic simulations. Peak ablation pressures exceeding 300 Mbar are inferred at absorbed laser intensities of ∼3×10(15) W/cm2. The shock strength is shown to be significantly enhanced by the coupling of suprathermal electrons with a total converted energy of up to 8% of the incident laser energy. At the end of the laser pulse, the shock pressure is estimated to exceed ∼1 Gbar because of convergence effects.
这封信件展示了在球形靶中引发数百 Mbar 量级激波的能力的首次实验验证——这是冲击点火的一个里程碑[R.贝蒂等人，物理评论快报 98, 155001 (2007)]。利用球形靶外表面强激波的发射与激波在中心汇聚之间的时间延迟，可以通过辐射流体动力学模拟推断激波发射压力。在吸收激光强度约为 3×10(15) W/cm2 时，推断出的峰值烧蚀压力超过 300 Mbar。实验结果表明，超热电子与激光能量的耦合将激波强度显著增强，总转换能量高达入射激光能量的 8%。在激光脉冲结束时，由于汇聚效应，估计激波压力超过 ∼1 Gbar。
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