Mitigation of self-focusing in Thomson scattering experiments
Abstract
A fundamental challenge associated with measuring Thomson scattering comes from the small scattering cross section associated with the interaction. Here, to improve photon statistics a powerful Thomson-scattering probe laser is required. Ponderomotive self-focusing limits the maximum power in the Thomson-scattering probe and was shown to limit the maximum achievable Thomson-scattering signal-to-noise ratio. Operating the laser at powers above the self-focusing critical power was shown to cause beam degradation, which reduced the amount of collected Thomson-scattered light. Using a phase plate was shown to improve laser beam propagation, and consequently improve the signal-to-noise ratio in the measured spectrum.
- Publication Date:
- Research Org.:
- Univ. of Rochester, NY (United States). Lab. for Laser Energetics
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- Contributing Org.:
- Laboratory for Laser Energetics, University of Rochester
- OSTI Identifier:
- 1572077
- Report Number(s):
- 2019-119, 2485, 1525
Journal ID: ISSN 1070-664X; 2019-119, 2485, 1525; TRN: US2100292
- Grant/Contract Number:
- NA0003856
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 26; Journal Issue: 10; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Hansen, A. M., Turnbull, D., Katz, J., and Froula, D. H. Mitigation of self-focusing in Thomson scattering experiments. United States: N. p., 2019.
Web. doi:10.1063/1.5125249.
Hansen, A. M., Turnbull, D., Katz, J., & Froula, D. H. Mitigation of self-focusing in Thomson scattering experiments. United States. https://doi.org/10.1063/1.5125249
Hansen, A. M., Turnbull, D., Katz, J., and Froula, D. H. Wed .
"Mitigation of self-focusing in Thomson scattering experiments". United States. https://doi.org/10.1063/1.5125249. https://www.osti.gov/servlets/purl/1572077.
@article{osti_1572077,
title = {Mitigation of self-focusing in Thomson scattering experiments},
author = {Hansen, A. M. and Turnbull, D. and Katz, J. and Froula, D. H.},
abstractNote = {A fundamental challenge associated with measuring Thomson scattering comes from the small scattering cross section associated with the interaction. Here, to improve photon statistics a powerful Thomson-scattering probe laser is required. Ponderomotive self-focusing limits the maximum power in the Thomson-scattering probe and was shown to limit the maximum achievable Thomson-scattering signal-to-noise ratio. Operating the laser at powers above the self-focusing critical power was shown to cause beam degradation, which reduced the amount of collected Thomson-scattered light. Using a phase plate was shown to improve laser beam propagation, and consequently improve the signal-to-noise ratio in the measured spectrum.},
doi = {10.1063/1.5125249},
journal = {Physics of Plasmas},
number = 10,
volume = 26,
place = {United States},
year = {Wed Oct 23 00:00:00 EDT 2019},
month = {Wed Oct 23 00:00:00 EDT 2019}
}
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Cited by: 9 works
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Figures / Tables:
FIG. 1: The curves represent the maximum signal-to-noise ratio achievable in a Thomson-scattering experiment as a function of electron temperature assuming a Thomson-scattering probe beam with a power equal to the critical power for self-focusing for a beam with (solid red) and without (dashed blue) a phase plate.
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Figures / Tables found in this record:
Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.