Lawrence Livermore National Laboratory, California 94551, USA.
Phys Rev Lett. 2011 Jul 1;107(1):015002. doi: 10.1103/PhysRevLett.107.015002.
We present the first x-ray Thomson scattering measurements of temperature and density from spherically imploding matter. The shape of the Compton downscattered spectrum provides a first-principles measurement of the electron velocity distribution function, dependent on T(e) and the Fermi temperature T(F)∼n(e)(2/3). In-flight compressions of Be and CH targets reach 6-13 times solid density, with T(e)/T(F)∼0.4-0.7 and Γ(ii)∼5, resulting in minimum adiabats of ∼1.6-2. These measurements are consistent with low-entropy implosions and predictions by radiation-hydrodynamic modeling.
我们呈现了首例通过 X 射线汤姆逊散射技术对球形内爆物质的温度和密度的测量结果。康普顿散射谱的形状提供了对电子速度分布函数的直接测量，该分布函数取决于 T(e)和费米温度 T(F)∼n(e)(2/3)。Be 和 CH 靶材的飞行压缩达到了固体密度的 6-13 倍，T(e)/T(F)∼0.4-0.7 和 Γ(ii)∼5，导致最小绝热指数约为 1.6-2。这些测量结果与低熵内爆以及辐射流体动力学模型的预测一致。
