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Title: Time-Resolved Thomson Scattering on Gas-Puff Z-Pinch Plasmas at Pinch Time

Abstract

The conditions and dynamics of neon gas puff Z-pinch plasmas at pinch time are studied on a pulsed power generator with a current rise time of approximately 200-ns and 0.9-mA peak current. Radial tailoring of the gas puff massdensity profile using a triple-nozzle coaxial valve (two annular gas liners and a central jet) allows production of both more stable and less stable (with regard to the magneto-Rayleigh– Taylor instability) Z-pinch implosions. A 526.5-nm, 10-J Thomson scattering diagnostic laser enables probing of the flow dynamics and plasma conditions of these implosions with both spatial and temporal resolutions. The 2.2-ns laser pulse scatters from the plasma electrons and is carried by one optical fiber to a visible light streak camera, and by a bundle of optical fibers to a time-gated camera, both after spectral dispersion by 750-mm spectrometers. The streak camera, with a 10-ns full streak time, provides subnanosecond resolution of the evolution of the pinch plasma parameters through stagnation. The timegated camera provides spatially resolved spectra (across a field of view of 6.1 mm) at the same time as the streak. Scattering spectra suggest that temperatures are high at stagnation, with the ion temperature as much as three times higher thanmore » the electron temperature. Furthermore, we consider the possibility of nonthermal explanations for the broad scattering spectra and high effective ion temperature, including collisionality, implosion velocity distributions (velocity gradients), and small-scale hydrodynamic motion.« less

Authors:
 [1];  [1];  [1];  [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:
1466251
Grant/Contract Number:  
NA0003764
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
IEEE Transactions on Plasma Science
Additional Journal Information:
Journal Volume: 46; Journal Issue: 11; Journal ID: ISSN 0093-3813
Publisher:
IEEE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; plasma diagnostics; plasma measurements; plasma properties

Citation Formats

Rocco, S. V. R., Banasek, J. T., Potter, W. M., Kusse, B. R., and Hammer, D. A. Time-Resolved Thomson Scattering on Gas-Puff Z-Pinch Plasmas at Pinch Time. United States: N. p., 2018. Web. doi:10.1109/TPS.2018.2860927.
Rocco, S. V. R., Banasek, J. T., Potter, W. M., Kusse, B. R., & Hammer, D. A. Time-Resolved Thomson Scattering on Gas-Puff Z-Pinch Plasmas at Pinch Time. United States. https://doi.org/10.1109/TPS.2018.2860927
Rocco, S. V. R., Banasek, J. T., Potter, W. M., Kusse, B. R., and Hammer, D. A. 2018. "Time-Resolved Thomson Scattering on Gas-Puff Z-Pinch Plasmas at Pinch Time". United States. https://doi.org/10.1109/TPS.2018.2860927. https://www.osti.gov/servlets/purl/1466251.
@article{osti_1466251,
title = {Time-Resolved Thomson Scattering on Gas-Puff Z-Pinch Plasmas at Pinch Time},
author = {Rocco, S. V. R. and Banasek, J. T. and Potter, W. M. and Kusse, B. R. and Hammer, D. A.},
abstractNote = {The conditions and dynamics of neon gas puff Z-pinch plasmas at pinch time are studied on a pulsed power generator with a current rise time of approximately 200-ns and 0.9-mA peak current. Radial tailoring of the gas puff massdensity profile using a triple-nozzle coaxial valve (two annular gas liners and a central jet) allows production of both more stable and less stable (with regard to the magneto-Rayleigh– Taylor instability) Z-pinch implosions. A 526.5-nm, 10-J Thomson scattering diagnostic laser enables probing of the flow dynamics and plasma conditions of these implosions with both spatial and temporal resolutions. The 2.2-ns laser pulse scatters from the plasma electrons and is carried by one optical fiber to a visible light streak camera, and by a bundle of optical fibers to a time-gated camera, both after spectral dispersion by 750-mm spectrometers. The streak camera, with a 10-ns full streak time, provides subnanosecond resolution of the evolution of the pinch plasma parameters through stagnation. The timegated camera provides spatially resolved spectra (across a field of view of 6.1 mm) at the same time as the streak. Scattering spectra suggest that temperatures are high at stagnation, with the ion temperature as much as three times higher than the electron temperature. Furthermore, we consider the possibility of nonthermal explanations for the broad scattering spectra and high effective ion temperature, including collisionality, implosion velocity distributions (velocity gradients), and small-scale hydrodynamic motion.},
doi = {10.1109/TPS.2018.2860927},
url = {https://www.osti.gov/biblio/1466251}, journal = {IEEE Transactions on Plasma Science},
issn = {0093-3813},
number = 11,
volume = 46,
place = {United States},
year = {Tue Aug 21 00:00:00 EDT 2018},
month = {Tue Aug 21 00:00:00 EDT 2018}
}

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Works referencing / citing this record:

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