Tierney Thomas E, Tierney Heidi E, Idzorek George C, Watt Robert G, Peterson Robert R, Peterson Darrell L, Fryer Christopher L, Lopez Mike R, Jones Michael C, Sinars Daniel, Rochau Gregory A, Bailey James E
Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, USA.
Rev Sci Instrum. 2008 Oct;79(10):10E919. doi: 10.1063/1.2992295.
The distance radiation waves that supersonically propagate in optically thick, diffusive media are energy sensitive. A blast wave can form in a material when the initially diffusive, supersonic radiation wave becomes transonic. Under specific conditions, the blast wave is visible with radiography as a density perturbation. [Peterson et al., Phys. Plasmas 13, 056901 (2006)] showed that the time-integrated drive energy can be measured using blast wave positions with uncertainties less than 10% at the Z Facility. In some cases, direct measurements of energy loss through diagnostic holes are not possible with bolometric and x-ray radiometric diagnostics. Thus, radiography of high compression blast waves can serve as a complementary technique that provides time-integrated energy loss through apertures. In this paper, we use blast waves to characterize the energy emerging through a 2.4 mm aperture and show experimental results in comparison to simulations.
在光学厚的扩散介质中超音速传播的远距离辐射波对能量敏感。当初始扩散的超音速辐射波变为跨音速时，材料中会形成冲击波。在特定条件下，射线照相可将冲击波视为密度扰动而显现出来。[彼得森等人，《物理等离子体》13，056901（2006）]表明，在Z装置中，利用冲击波位置可测量时间积分驱动能量，其不确定度小于10%。在某些情况下，使用测热和X射线辐射诊断无法直接测量通过诊断孔的能量损失。因此，高压缩冲击波的射线照相可作为一种补充技术，通过孔径提供时间积分能量损失。在本文中，我们利用冲击波来表征通过2.4毫米孔径出现的能量，并展示与模拟结果相比的实验结果。
