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Title: Time-resolved and multiple-angle Thomson scattering on gas-puff Z-Pinch plasmas at pinch time

Abstract

A 526.5 nm Thomson scattering diagnostic laser enables probing of the plasma conditions of neon gas-puff z-pinch implosions with temporal resolution. Splitting the laser into two 2.5 J pulses, both 2.3 ns in duration and separated by 4 ns, allows observation of sub-nanosecond time-resolved spectra for a total time of 7 ns. Collection optics were set at 90° and 30° to the laser, observing the same on-axis scattering volume with a radial extent of 0.4 mm. The spectra from both angles were collected by using the same streak camera, using a coupling system that allowed us to obtain temporal, spectral, and angular resolution in the same image. By comparing the ion-acoustic spectra from the two angles, we determined electron temperature and a range of possible electron densities. Measurements made in the 1-3 ns period before pinch time show best fit (determined by a least-squares method) electron densities of around 2 × 1019 cm-3, increasing to 1.5 × 1020 cm-3 in the 3 ns following the start of the x-ray burst (t = 0 ns) from the pinch. The electron temperature increases from 300 eV to 500 eV at t = 0 ns before decreasing to below 300 eV after pinchmore » time. With the present parameters (probe beam, collection angles, and electron temperature and density), this diagnostic method is too insensitive to electron density to provide more than a constraint on that parameter. Plasma regimes in which this technique could determine electron density with some precision are calculated.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1]
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  1. Cornell Univ., Ithaca, NY (United States). Lab. of Plasma Studies
Publication Date:
Research Org.:
Cornell Univ., Ithaca, NY (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1614452
Alternate Identifier(s):
OSTI ID: 1478279
Grant/Contract Number:  
NA0001836; NA0003764; B619181
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Instruments & Instrumentation; Physics; Thomson scattering; Streak cameras; Electron density

Citation Formats

Rocco, Sophia V. R., Banasek, Jacob T., Potter, William M., and Hammer, David A. Time-resolved and multiple-angle Thomson scattering on gas-puff Z-Pinch plasmas at pinch time. United States: N. p., 2018. Web. doi:10.1063/1.5038879.
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Rocco, Sophia V. R., Banasek, Jacob T., Potter, William M., & Hammer, David A. Time-resolved and multiple-angle Thomson scattering on gas-puff Z-Pinch plasmas at pinch time. United States. https://doi.org/10.1063/1.5038879
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Rocco, Sophia V. R., Banasek, Jacob T., Potter, William M., and Hammer, David A. Fri . "Time-resolved and multiple-angle Thomson scattering on gas-puff Z-Pinch plasmas at pinch time". United States. https://doi.org/10.1063/1.5038879. https://www.osti.gov/servlets/purl/1614452.
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@article{osti_1614452,
title = {Time-resolved and multiple-angle Thomson scattering on gas-puff Z-Pinch plasmas at pinch time},
author = {Rocco, Sophia V. R. and Banasek, Jacob T. and Potter, William M. and Hammer, David A.},
abstractNote = {A 526.5 nm Thomson scattering diagnostic laser enables probing of the plasma conditions of neon gas-puff z-pinch implosions with temporal resolution. Splitting the laser into two 2.5 J pulses, both 2.3 ns in duration and separated by 4 ns, allows observation of sub-nanosecond time-resolved spectra for a total time of 7 ns. Collection optics were set at 90° and 30° to the laser, observing the same on-axis scattering volume with a radial extent of 0.4 mm. The spectra from both angles were collected by using the same streak camera, using a coupling system that allowed us to obtain temporal, spectral, and angular resolution in the same image. By comparing the ion-acoustic spectra from the two angles, we determined electron temperature and a range of possible electron densities. Measurements made in the 1-3 ns period before pinch time show best fit (determined by a least-squares method) electron densities of around 2 × 1019 cm-3, increasing to 1.5 × 1020 cm-3 in the 3 ns following the start of the x-ray burst (t = 0 ns) from the pinch. The electron temperature increases from 300 eV to 500 eV at t = 0 ns before decreasing to below 300 eV after pinch time. With the present parameters (probe beam, collection angles, and electron temperature and density), this diagnostic method is too insensitive to electron density to provide more than a constraint on that parameter. Plasma regimes in which this technique could determine electron density with some precision are calculated.},
doi = {10.1063/1.5038879},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {Fri Oct 19 00:00:00 EDT 2018},
month = {Fri Oct 19 00:00:00 EDT 2018}
}
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Publisher's Version of Record
https://doi.org/10.1063/1.5038879
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Works referenced in 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
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Optical Thomson Scattering Measurements of Plasma Parameters in the Ablation Stage of Wire Array Z Pinches
journal, April 2012

Characterization of the COBRA triple-nozzle gas-puff valve using planar laser induced fluorescence
conference, January 2014

  • de Grouchy, P. W. L.; Rosenberg, E.; Qi, N.
  • 9TH INTERNATIONAL CONFERENCE ON DENSE Z PINCHES, AIP Conference Proceedings
  • DOI: 10.1063/1.4904773

Z pinch imploding plasma density profile measurements using a two-frame laser shearing interferometer
journal, February 2002

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Gas puff Z-pinch implosions with external Bz field on COBRA
conference, January 2014

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  • 9TH INTERNATIONAL CONFERENCE ON DENSE Z PINCHES, AIP Conference Proceedings
  • DOI: 10.1063/1.4904775
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    journal, August 2019

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