Proton radiography of a laser-driven implosion
Proton radiography of a laser-driven implosion
复制标题
DOI：
10.1103/physrevlett.97.045001
复制
发表时间：
2006-07-28
影响因子：
8.6
通讯作者：
Town, R. P. J.
中科院分区：
文献类型：
--
作者：
Mackinnon, A. J.;Patel, P. K.;Town, R. P. J.
用皮秒激光脉冲加速的质子对直径500 μ m的胶囊进行了x线摄影，该胶囊在6束波长1.054 μ m、脉冲长度1ns的对称入射光束中内爆300 J的激光。用点投影质子背光来表征内爆在离散时刻的密度梯度。在内爆的早期和停滞阶段都诊断出不对称。与解析散射理论和简单蒙特卡罗模拟比较，结果与直径为85 +/- 10 μ m的3 +/- 1 g/cm(3)芯相一致。标度模拟表明，在点火标度条件下，诊断不对称性需要质子> ~ 50 MeV。
Protons accelerated by a picosecond laser pulse have been used to radiograph a 500 mu m diameter capsule, imploded with 300 J of laser light in 6 symmetrically incident beams of wavelength 1.054 mu m and pulse length 1 ns. Point projection proton backlighting was used to characterize the density gradients at discrete times through the implosion. Asymmetries were diagnosed both during the early and stagnation stages of the implosion. Comparison with analytic scattering theory and simple Monte Carlo simulations were consistent with a 3 +/- 1 g/cm(3) core with diameter 85 +/- 10 mu m. Scaling simulations show that protons > 50 MeV are required to diagnose asymmetry in ignition scale conditions.