Time-Resolved Thomson Scattering on Laboratory Plasma Jets

Banasek, J. T.; Byvank, T.; Rocco, S. V. R.; Potter, W. M.; Kusse, B. R.; Hammer, D. A.

doi:10.1109/TPS.2018.2850278

Time-Resolved Thomson Scattering on Laboratory Plasma Jets

Journal Article · Tue Jul 10 00:00:00 EDT 2018 · IEEE Transactions on Plasma Science

DOI:https://doi.org/10.1109/TPS.2018.2850278· OSTI ID:1459865

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Cornell Univ., Ithaca, NY (United States); Cornell University
Cornell Univ., Ithaca, NY (United States)

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.

Research Organization:: Cornell Univ., Ithaca, NY (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003764

OSTI ID:: 1459865

Journal Information:: IEEE Transactions on Plasma Science, Journal Name: IEEE Transactions on Plasma Science Journal Issue: 99 Vol. PP; ISSN 0093-3813

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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