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Title: Time-Resolved Thomson Scattering on Laboratory Plasma Jets

Abstract

In this study, Thomson scattering measurements were performed on plasma jets created from a 15-μm-thick radial Al foil load on a 1-MA pulsed power machine. The laser used for these measurements has a maximum energy of 10 J at 526.5 nm. Using the full energy, however, significantly heats the 5x10¹⁸ cm⁻³ jet by inverse bremsstrahlung, creating a density bubble in the jet. To measure the evolving plasma parameters of this laser-heated jet, a streak camera was used to record the scattered spectrum, resulting in the sub-ns time-resolved Thomson scattering. Analysis of the streak camera image showed that the electron temperature of the jet was about 25 eV prior to the laser pulse. The laser then heated the plasma to 80-100 eV within about 2 ns. The electron temperature then stabilized for about 0.5 ns prior to falling at the end of the laser pulse. Jets made from a radial Ti foil showed more heating by the laser than the Al jets, going from 50 to over 150 eV, and heating was detected even when only 1 J of laser energy was used. Also, the ion-acoustic peaks in the scattered spectrum from the Ti jets were significantly narrower than those frommore » Al jets, a result of several possible differences in the plasma created from these two materials.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1]
  1. Cornell Univ., Ithaca, NY (United States)
Publication Date:
Research Org.:
Cornell Univ., Ithaca, NY (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1459865
Grant/Contract Number:  
NA0003764
Resource Type:
Accepted Manuscript
Journal Name:
IEEE Transactions on Plasma Science
Additional Journal Information:
Journal Volume: PP; Journal Issue: 99; Journal ID: ISSN 0093-3813
Publisher:
IEEE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Banasek, J. T., Byvank, T., Rocco, S. V. R., Potter, W. M., Kusse, B. R., and Hammer, D. A. Time-Resolved Thomson Scattering on Laboratory Plasma Jets. United States: N. p., 2018. Web. https://doi.org/10.1109/TPS.2018.2850278.
Banasek, J. T., Byvank, T., Rocco, S. V. R., Potter, W. M., Kusse, B. R., & Hammer, D. A. Time-Resolved Thomson Scattering on Laboratory Plasma Jets. United States. https://doi.org/10.1109/TPS.2018.2850278
Banasek, J. T., Byvank, T., Rocco, S. V. R., Potter, W. M., Kusse, B. R., and Hammer, D. A. Tue . "Time-Resolved Thomson Scattering on Laboratory Plasma Jets". United States. https://doi.org/10.1109/TPS.2018.2850278. https://www.osti.gov/servlets/purl/1459865.
@article{osti_1459865,
title = {Time-Resolved Thomson Scattering on Laboratory Plasma Jets},
author = {Banasek, J. T. and Byvank, T. and Rocco, S. V. R. and Potter, W. M. and Kusse, B. R. and Hammer, D. A.},
abstractNote = {In this study, Thomson scattering measurements were performed on plasma jets created from a 15-μm-thick radial Al foil load on a 1-MA pulsed power machine. The laser used for these measurements has a maximum energy of 10 J at 526.5 nm. Using the full energy, however, significantly heats the 5x10¹⁸ cm⁻³ jet by inverse bremsstrahlung, creating a density bubble in the jet. To measure the evolving plasma parameters of this laser-heated jet, a streak camera was used to record the scattered spectrum, resulting in the sub-ns time-resolved Thomson scattering. Analysis of the streak camera image showed that the electron temperature of the jet was about 25 eV prior to the laser pulse. The laser then heated the plasma to 80-100 eV within about 2 ns. The electron temperature then stabilized for about 0.5 ns prior to falling at the end of the laser pulse. Jets made from a radial Ti foil showed more heating by the laser than the Al jets, going from 50 to over 150 eV, and heating was detected even when only 1 J of laser energy was used. Also, the ion-acoustic peaks in the scattered spectrum from the Ti jets were significantly narrower than those from Al jets, a result of several possible differences in the plasma created from these two materials.},
doi = {10.1109/TPS.2018.2850278},
journal = {IEEE Transactions on Plasma Science},
number = 99,
volume = PP,
place = {United States},
year = {2018},
month = {7}
}

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Figures / Tables:

Figure 1 Figure 1: Typical COBRA current trace together with the laser monitor (in arbitrary units) at a typical measurement time.

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Works referencing / citing this record:

Multi-angle multi-pulse time-resolved Thomson scattering on laboratory plasma jets
journal, October 2018

  • Banasek, J. T.; Rocco, S. V. R.; Potter, W. M.
  • Review of Scientific Instruments, Vol. 89, Issue 10
  • DOI: 10.1063/1.5034310

Improvement in Thomson scattering diagnostic precision via fitting the multiple-wavenumber spectra simultaneously
journal, August 2019

  • Liu, Yaoyuan; Ding, Yongkun; Zheng, Jian
  • Review of Scientific Instruments, Vol. 90, Issue 8
  • DOI: 10.1063/1.5110932

Pulse-burst laser-based 10 kHz Thomson scattering measurements
journal, August 2019


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