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• High Power Laser Science and Engineering
• Vol. 4, Issue 3, 03000e30 (2016)
E. Brambrink1、2、*, S. Baton1、2, M. Koenig1、2、3, R. Yurchak1、2, N. Bidaut1、2, B. Albertazzi1、2, J. E. Cross4, G. Gregori4, A. Rigby4, E. Falize5, A. Pelka6, F. Kroll6, S. Pikuz7, Y. Sakawa8, N. Ozaki9, C. Kuranz10, M. Manuel10, C. Li11, P. Tzeferacos12, and D. Lamb12
Author Affiliations
• 1LULI - CNRS, Ecole Polytechnique, CEA : Universit′e Paris-Saclay
• 2UPMC Univ Paris 06 : Sorbonne Universit′es - F-91128 Palaiseau cedex, France
• 3Institute for Academic Initiatives, Osaka U., Suita, Osaka 565-0871, Japan
• 4Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK
• 5CEA-DAM-DIF, F-91297 Arpajon, France
• 6HZDR, Bautzner Landstrae 400, 01328 Dresden, Germany
• 7JIHT-RAS, 13-2 Izhorskaya st., Moscow, 125412, Russia
• 8Institute of Laser Engineering, Osaka U., Suita, Osaka 565-0871, Japan
• 9Graduate School of Engineering, Osaka U., Suita, Osaka 565-0871, Japan
• 10Department of Energy Engineering Science, Faculty of Engineering Sciences, Kyushu University, Japan
• 11Plasma Science and Fusion Center, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
• 12Flash Center for Computational Science, University of Chicago, IL 60637, USA
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Abstract

We have developed a new radiography setup with a short-pulse laser-driven x-ray source. Using a radiography axis perpendicular to both long- and short-pulse lasers allowed optimizing the incident angle of the short-pulse laser on the x-ray source target. The setup has been tested with various x-ray source target materials and different laser wavelengths. Signal to noise ratios are presented as well as achieved spatial resolutions. The high quality of our technique is illustrated on a plasma flow radiograph obtained during a laboratory astrophysics experiment on POLARs.

1 Introduction

Pulsed x-ray radiography allows the study of fast evolving phenomena like shock compression of matter or plasma outflows. Using short-pulse laser-driven x-ray sources with ps pulse duration helps to reduce smearing of even high velocity phenomena ($v>100~\text{km}~\text{s}^{-1}$) to the $\unicode[STIX]{x03BC}\text{m}$ scale, making this technique ideal for the highly transient laser-driven compression and hydrodynamics. For example, studying condensed matter at high pressures ($\gg 1~\text{Mbar}$) is an important field of research due to its outreach for planetary science, inertial confinement fusion and condensed matter physics in general (phase transitions, high pressure chemistry). Laboratory astrophysics studying plasma flows and instabilities using high-energy laser systems have also strongly evolved in the recent years. X-ray radiography is fundamental in these experiments to investigate these flows’ temporal evolution as they are often opaque to visible light. The development of high-energy lasers like NIF and LMJ opens new opportunities for experiments and makes the study of these extreme states of matter with this type of diagnostic even more critical. The transient character of all these experiments requires x-ray radiography with high temporal resolution, which allows measuring density distributions, direct density measurements[1], instabilities growth[2] and plasma shapes[3]. Depending on the time evolution of the plasma to be investigated, this diagnostic requires an x-ray source with a short duration (${\approx}1~\text{ps}$), photon energies in the range of a few keV to ${>}$ 100 keV and a sufficient large photon number to obtain a radiograph.

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E. Brambrink, S. Baton, M. Koenig, R. Yurchak, N. Bidaut, B. Albertazzi, J. E. Cross, G. Gregori, A. Rigby, E. Falize, A. Pelka, F. Kroll, S. Pikuz, Y. Sakawa, N. Ozaki, C. Kuranz, M. Manuel, C. Li, P. Tzeferacos, D. Lamb. Short-pulse laser-driven x-ray radiography[J]. High Power Laser Science and Engineering, 2016, 4(3): 03000e30