Recovering particle velocity and size distributions in ejecta with photon Doppler velocimetry

Author:

Don Jayamanne J. A.12ORCID,Outerovitch R.1,Ballanger F.1,Bénier J.1,Blanco E.1,Chauvin C.3,Hereil P.3,Tailleur J.1,Durand O.14ORCID,Pierrat R.2ORCID,Carminati R.25ORCID,Hervouët A.1,Gandeboeuf P.1,Burie J.-R.1

Affiliation:

1. CEA DIF, Bruyères-le-Châtel 1 , 91297 Arpajon Cedex, France

2. Institut Langevin, ESPCI Paris, PSL University, CNRS 2 , 75005 Paris, France

3. CEA, DAM, GRAMAT, BP 80200 3 , F-46500 Gramat, France

4. Paris-Saclay University, CEA, Laboratoire Matière en Conditions Extrêmes 4 , 91180 Bruyères-le-Châtel, France

5. Institut d’Optique Graduate School, Paris-Saclay University 5 , 91127 Palaiseau, France

Abstract

When a solid metal is struck, its free surface can eject fast and fine particles. Despite the many diagnostics that have been implemented to measure the mass, size, velocity, or temperature of ejecta, these efforts provide only a partial picture of this phenomenon. Ejecta characterization, especially in constrained geometries, is an inherently ill-posed problem. In this context, Photon Doppler Velocimetry (PDV) has been a valuable diagnostic, measuring reliably particles and free surface velocities in the single scattering regime. Here, we present ejecta experiments in gas and how, in this context, PDV allows one to retrieve additional information on the ejecta, i.e., information on the particles’ size. We explain what governs ejecta transport in gas and how it can be simulated. To account for the multiple scattering of light in these ejecta, we use the Radiative Transfer Equation (RTE) that quantitatively describes PDV spectrograms, and their dependence not only on the velocity but also on the size distribution of the ejecta. We remind how spectrograms can be simulated by solving numerically this RTE and we show how to do so on hydrodynamic ejecta simulation results. Finally, we use this complex machinery in different ejecta transport scenarios to simulate the corresponding spectrograms. Comparing these to experimental results, we iteratively constrain the ejecta description at an unprecedented level. This work demonstrates our ability to recover particle size information from what is initially a velocity diagnostic, but more importantly it shows how, using existing simulation of ejecta, we capture through simulation the complexity of experimental spectrograms.

Publisher

AIP Publishing

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3