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Title: Streaked Optical Pyrometer System for Laser-Driven Shock-Wave Experiments on OMEGA

Abstract

The temperature of laser-driven shock waves is of interest to inertial confinement fusion and high-energy-density physics. We report on a streaked optical pyrometer that measures the self-emission of laser-driven shocks simultaneously with a velocity interferometer system for any reflector (VISAR). Together these diagnostics are used to obtain the temporally and spatially resolved temperatures of ~Mbar shocks driven by the OMEGA laser. We provide a brief description of the diagnostic and how it is used with VISAR. Key spectral calibration results are discussed and important characteristics of the recording system are presented.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Laboratory for Laser Energetics, University of Rochester
Sponsoring Org.:
USDOE
OSTI Identifier:
902979
Report Number(s):
DOE/SF/19460-735
Journal ID: ISSN 0034-6748; RSINAK; 2006-11; 1696; TRN: US0703227
DOE Contract Number:
FC52-92SF19460
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 78
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CALIBRATION; INERTIAL CONFINEMENT; INTERFEROMETERS; OPTICAL PYROMETERS; PHYSICS; RECORDING SYSTEMS; SHOCK WAVES; VELOCITY

Citation Formats

Miller, J.E., Boehly, T.R., Melchior, Meyerhofer, D.D., Celliers, P.M., Eggert, J.H., Hicks, D.G., Sorce, C.M., Oertel, J.A., and Emmel, P.M. Streaked Optical Pyrometer System for Laser-Driven Shock-Wave Experiments on OMEGA. United States: N. p., 2007. Web. doi:10.1063/1.2712189.
Miller, J.E., Boehly, T.R., Melchior, Meyerhofer, D.D., Celliers, P.M., Eggert, J.H., Hicks, D.G., Sorce, C.M., Oertel, J.A., & Emmel, P.M. Streaked Optical Pyrometer System for Laser-Driven Shock-Wave Experiments on OMEGA. United States. doi:10.1063/1.2712189.
Miller, J.E., Boehly, T.R., Melchior, Meyerhofer, D.D., Celliers, P.M., Eggert, J.H., Hicks, D.G., Sorce, C.M., Oertel, J.A., and Emmel, P.M. Fri . "Streaked Optical Pyrometer System for Laser-Driven Shock-Wave Experiments on OMEGA". United States. doi:10.1063/1.2712189.
@article{osti_902979,
title = {Streaked Optical Pyrometer System for Laser-Driven Shock-Wave Experiments on OMEGA},
author = {Miller, J.E. and Boehly, T.R. and Melchior, Meyerhofer, D.D. and Celliers, P.M. and Eggert, J.H. and Hicks, D.G. and Sorce, C.M. and Oertel, J.A. and Emmel, P.M.},
abstractNote = {The temperature of laser-driven shock waves is of interest to inertial confinement fusion and high-energy-density physics. We report on a streaked optical pyrometer that measures the self-emission of laser-driven shocks simultaneously with a velocity interferometer system for any reflector (VISAR). Together these diagnostics are used to obtain the temporally and spatially resolved temperatures of ~Mbar shocks driven by the OMEGA laser. We provide a brief description of the diagnostic and how it is used with VISAR. Key spectral calibration results are discussed and important characteristics of the recording system are presented.},
doi = {10.1063/1.2712189},
journal = {Review of Scientific Instruments},
number = ,
volume = 78,
place = {United States},
year = {Fri Mar 23 00:00:00 EDT 2007},
month = {Fri Mar 23 00:00:00 EDT 2007}
}
  • A temporally and spatially resolved optical pyrometer system has been fielded on Gekko XII experiments. The system is based on the self-emission measurements with a gated optical imager (GOI) and a streaked optical pyrometer (SOP). Both detectors measure the intensity of the self-emission from laser-produced plasmas at the wavelength of 450 nm with a bandpass filter with a width of {approx}10 nm in FWHM. The measurements were calibrated with different methods, and both results agreed with each other within 30% as previously reported [T. Morita et al., Astrophys. Space Sci. 336, 283 (2011)]. As a tool for measuring the propertiesmore » of low-density plasmas, the system is applicable for the measurements of the electron temperature and density in collisionless shock experiments [Y. Kuramitsu et al., Phys. Rev. Lett. 106, 175002 (2011)].« less
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  • Experiments in high-energy-density physics often use optical pyrometry to determine temperatures of dynamically compressed materials. In combination with simultaneous shock-velocity and optical-reflectivity measurements using velocity interferometry, these experiments provide accurate equation-of-state data at extreme pressures (P > 1 Mbar) and temperatures (T > 0.5 eV). This paper reports on the absolute calibration of the streaked optical pyrometer (SOP) at the Omega Laser Facility. The wavelength-dependent system response was determined by measuring the optical emission from a National Institute of Standards and Technology–traceable tungsten-filament lamp through various narrowband (40 nm-wide) filters. The integrated signal over the SOP’s ~250-nm operating range ismore » then related to that of a blackbody radiator using the calibrated response. We present a simple closed-form equation for the brightness temperature as a function of streak-camera signal derived from this calibration. As a result, error estimates indicate that brightness temperature can be inferred to a precision of <5%.« less
  • A system for measurement of the spectral radiance of materials shocked to high pressures (approx.100 GPa) by impact using a light gas gun is described. Thermal radiation from the sample is sampled at six wavelength bands in the visible spectrum, and each signal is separately detected by solid-state photodiodes, and recorded with a time resolution of approx.10 ns. Interpretation of the records in terms of temperature of transparent sample materials is discussed. Results of a series of exploratory experiments with metals are also given. Shock temperatures in the range 4000--8000 K have been reliably measured. Spectral radiance and temperatures havemore » been determined with uncertainties of 2%.« less