Determination of the laser intensity applied to a Ta witness plate from the measured X-ray signal using a pulsed micro-channel plate detector

Pickworth, L. A.; Rosen, M. D.; Schneider, M. B.; Hinkel, D. E.; Benedetti, L. R.; Kauffmann, R. L.; Wu, S. S.

doi:10.1016/j.hedp.2017.04.003

Title: Determination of the laser intensity applied to a Ta witness plate from the measured X-ray signal using a pulsed micro-channel plate detector

Journal Article · Fri Apr 14 00:00:00 EDT 2017 · High Energy Density Physics

DOI:https://doi.org/10.1016/j.hedp.2017.04.003· OSTI ID:1368031

Pickworth, L. A. ^[1]; Rosen, M. D. ^[1]; Schneider, M. B. ^[1]; Hinkel, D. E. ^[1]; Benedetti, L. R. ^[1]; Kauffmann, R. L. ^[1]; Wu, S. S. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

The laser intensity distribution at the surface of a high-Z material, such as Ta, can be deduced from imaging the self-emission of the produced x-ray spot using suitable calibration data. This paper presents a calibration method which uses the measured x-ray emissions from laser spots of di erent intensities hitting a Ta witness plate. The x-ray emission is measured with a micro-channel plate (MCP) based x-ray framing camera plus filters. Data from di erent positions on one MCP strip or from di erent MCP assemblies are normalized to each other using a standard candle laser beam spot at 1x10¹⁴ W/cm² intensity. The distribution of the resulting dataset agrees with results from a pseudo spectroscopic model for laser intensities between 4 and 15x10¹³ W/cm². The model is then used to determine the absolute scaling factor between the experimental results from assemblies using two di erent x-ray filters. The data and model method also allows unique calibration factors for each MCP system and each MCP gain to be compared. We also present simulation results investigating alternate witness plate materials (Ag, Eu and Au).

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1368031

Report Number(s):: LLNL-JRNL-716802

Journal Information:: High Energy Density Physics, Vol. 23; ISSN 1574-1818

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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