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Developing targets for radiation transport experiments at the Omega laser facility

High Power Laser Science and Engineering 2017年第3期5卷 1-4页

作者： D.Capelli C.A.Charsley-Groffman R.B.Randolph D.W.Schmidt T.Cardenas F.Fierro G.Rivera C.Hamilton J.D.Hager H.M.Johns N.E.Lanier J.L.Kline Los Alamos National Laboratory

Targets have been developed to measure supersonic radiation transport in aerogel foams usinff absorption spectroscopy. The target consists of an aerogel foam uniformly doped with either titanium or scandium inserted into an undoped aerogel foam package. This creates a localized doped foam region to provide spatial resolution for the measurement. Development and characterization of the foams is a key challenge in addition to machining and assembling the two foams so they mate without gaps. The foam package is inserted into a beryllium sleeve and mounted on a gold hohlranm. The target is mounted to a holder created using additive manufacturing and mounted on a stalk. The manufacturing of the components, along with assembly and metrology of the target are described here.

关键词： absorption spectroscopy doped foams radiation transport

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Characteristic parameters of diffusive supersonic radiation transport in low density materials

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Chinese Physics B 2007年第1期16卷 193-199页

作者：江少恩杨家敏郑志坚丁永坤 National Key Laboratory of Laser Fusion Research Center of Laser Fusion China Academy of Engineering Physics Mianyang 621900 China

Diffusive heat waves play an important role in radiation hydrodynamics. In low density material, it may be possible that the radiative energy flux dominates the material energy flux and thus energy flow can be determined. In this paper by means of a simple algebraic method, the expressions characterizing the condition of diffusion approximation and supersonic transport of heat wave are found. In this case, the ratio of the radiative energy flux to the material energy flux is directly proportional to the product of Mach number M multiplied by optical depth τ. And it may also be expressed by radiation temperature heating material. The material density and length may be determined in order to achieve above-mentioned conditions when the driven temperature and duration are given.

关键词： radiation transport Mach number optical depth critical radiation temperature

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Electron Temperature Measurement of radiation-Heated CH Foam on Shenguang Ⅱ Laser Facility

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Plasma Science and Technology 2010年第3期12卷 300-303页

作者：赵阳熊刚尚万里朱托胡智民韦敏习杨国洪杨家敏张继彦靳奉涛 Research Center of Laser Fusion China Academy of Engineering Physics Department of Physics National University of Defense Technology

A spectroscopic diagnostic method, to measure electron temperature of radiationheated CH foam on Shenguang Ⅱ laser facility, is described. A tracer layer of aluminum was embedded in the middle of the CH foam and a point-projection method used in the opacity experiment was induced to measure the transmission spectrum of the embedded Al foil. The electron temperature, of about 80 eV, was deduced through a comparison of the experimental absorption spectrum with the calculated one with a detailed level accounting opacity code. The results of hydrodynamic simulation show that it＇s reasonable to determine the CH foam temperature by measuring the embedded Al absorption spectrum. Thus, the electron temperature of radiationheated CH foam was obtained.

关键词： radiation transport electron temperature X-ray spectrum

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