Study Of Multilayers Subjected To Intense Radiation

Knight, Larry V.; Gray, Kevin J.; Peterson, Bryan G.; Thorne, James M.; Perkins, Raymond T.

doi:10.1117/12.964938

Cited by 2 publications

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“…The ROMULS code has been used to simulate the performance of V/C, W/C, WC/C, and TaC/C multilayers. The results of these simulations are shown in figures [5][6][7][8]. The geometry of the multilayers is similar, with d-spacings near 22 Â, y = 0.4 and 99 layer pairs each.…”

Section: Assumptionsmentioning

confidence: 92%

“…Figure 4 is a log-log plot of cumulative absorbed energy vs. rate of energy deposition. It does not show survival time directly, but it should be noted [6,7] [1]). that the ordinate divided by the abscissa has units of time.…”

Section: Assumptionsmentioning

confidence: 98%

“…Gray et al [6,7] used two synchronous laser generated plasmas as X-ray sources. They were produced by the Phoenix (Janus) laser facility at Lawrence Livermore National Laboratory.…”

Section: Assumptionsmentioning

confidence: 99%

“…Thorne et al [2] have studied the optimum materials for damage resistant performance for both continuous-use and pulsed applications. Methods of estimating multilayer damage as a function of time during periods of irradiation have been developed [1][2][3][4][5][6][7]. Some experimental damage data has been obtained in X-ray laser experiments [8][9][10], and in experiments specifically designed to make a quantitative measurement of the reflectivity degradation of a multilayer mirror while it was subjected to a short pulse of intense X radiation [3,4,6,7,11].…”

mentioning

confidence: 99%

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Design of X-UV multilayers for high X-ray flux

Knight

Thorne

Toor

et al. 1988

Rev. Phys. Appl. (Paris)

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2014 Les cavités de laser X, les diagnostics de plasmas et les optiques pour les sources synchrotrons sont quelques exemples d'applications envisagées des multicouches X-UV où les flux à réfléchir sont intenses. Cet article passe en revue les processus physiques qui diminuent les performances des miroirs, le choix des couples de matériaux les plus résistants à l'échauffement, les méthodes employant des modèles analytiques ou semi analytiques ainsi que les codes hydrodynamiques permettant de prédire les performances sous flux intenses. Des résultats expérimentaux sont présentés, analysés et comparés avec les prévisions. Par exemple des miroirs interférentiels en W/C, V/C et WC/C conservent leur réflectivité pendant environ 1 ns lorsqu'ils sont soumis à des flux de l'ordre de 150 MW cm-2 à l'aide de plasmas crées par laser. Suivant l'application particulière envisagée, des études expérimentales et théoriques complémentaires sont nécessaires. Les techniques développées pour de tels miroirs devraient aussi permettre d'étudier des processus importants dans les matériaux.Abstract. 2014 Many promising applications for multilayer X-ray optical elements 2014 X-ray laser cavities, plasma diagnostics, synchrotron optics, etc. 2014 subject them to intense X radiation. This paper discusses the initial attempts at understanding the physical processes that are likely to degrade the performance of multilayer X-ray mirrors, the selection of optimal pairs of materials to resist heat damage, methods 2014 including simple analytic, semianalytic models and hydrodynamic code simulations 2014 of estimating multilayer performance under extreme heat loading, and finally experimental data is presented, discussed, analyzed and compared with predictions. For example W/C, V/C, and WC/C multilayers subjected to X-ray fluxes on the order of 150 MW cm-2 using laser generated plasma maintain near peak reflectivity for at least 1 ns, but are eventually destroyed. Considerably more theoretical and experimental study at higher incident fluxes will be required before our understanding is sufficient to routinely design optimal multilayer mirrors for a particular high flux application. It also appears that the experimental techniques developed in the study of robust multilayers may be useful for the investigation of processes important in materials.

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Section: Assumptionsmentioning

confidence: 92%

Section: Assumptionsmentioning

confidence: 98%

“…Gray et al [6,7] used two synchronous laser generated plasmas as X-ray sources. They were produced by the Phoenix (Janus) laser facility at Lawrence Livermore National Laboratory.…”

Section: Assumptionsmentioning

confidence: 99%

mentioning

confidence: 99%

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Design of X-UV multilayers for high X-ray flux

Knight

Thorne

Toor

et al. 1988

Rev. Phys. Appl. (Paris)

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Development Of Robust Multilayer Optics For Use In High-Peak Power Radiation Environments

et al. 1993

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In many applications, x-ray mulhilayer mirrors are exposed to high peak fluxes of x-rays with subsequent damage to the mirror. Mirror damage is a particularly severe problem with the use of multilayers as cavity optics for short wavelength x-ray lasers. Intense optical and x-ray radiation, from the x-ray laser plasma amplifier, often damages the multilayer mirror on time scales of hundreds of picoseconds. The phenomenon of multilayer mirror damage by pulsed xray emission has been studied using short duration (500 psec) bursts of soft x-rays from a laser produced gold plasma. The results of the experiments will be compared with some simple models and the possibility of increasing the damage thresholds of short wavelength multilayer mirrors will be discussed.

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Study Of Multilayers Subjected To Intense Radiation

Abstract: Many promising applications of multilayer x -ray optical elements subject them to intense radiation. In this paper we present simulations of multilayer performance under extreme heat loads and preliminary results of robust multilayer characterization experiments.

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Design of X-UV multilayers for high X-ray flux

Design of X-UV multilayers for high X-ray flux

Development Of Robust Multilayer Optics For Use In High-Peak Power Radiation Environments

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