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Title: Study of Triple Ar Gas Puff Z-Pinches on 0.9-MA, 200-ns COBRA

Abstract

Ar gas puff z-pinch experiments were conducted on the 0.9 MA, 200 ns COBRA generator at Cornell University. In the experiments, a triple-nozzle gas valve was used to produce the zpinch load with concentric outer and inner gas puffs and a central gas jet. We used Planer Laser Induced Fluorescence (PLIF) to measure the initial gas profile of the load, two 4-frame 4-ns gated XUV cameras to image the imploding plasma, and filtered Photo- Conducting Diamond Detectors (PCDs) to measure the x-ray output. We have observed shock heating and/or photoionization of the dense center jet by the imploding plasma. With an outer to inner plenum pressure ratio of 1:3, de-acceleration of the imploding plasma occurred when the outer plasma shell imploded on the inner shell resulting in a stable implosion. By varying the plenum pressure for the center jet, the x-ray emission was optimized. In conclusion, an Ar K-shell x-ray (3-4 keV) yield of 77±17 J was produced at a current level of 0.87±0.2 MA and an implosion time of 200-ns.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [2];  [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [2];  [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [2];  [4];  [4];  [4]
  1. Cornell Univ., Ithaca, NY (United States). Lab. of Plasma Studies; L-3 Applied Technologies, Inc., San Leandro, CA (United States)
  2. Cornell Univ., Ithaca, NY (United States). Lab. of Plasma Studies
  3. Cornell Univ., Ithaca, NY (United States). Lab. of Plasma Studies; Naval Research Lab. (NRL), Washington, DC (United States). Plasma Physics Division
  4. Weizmann Inst. of Science, Rehovot (Israel)
Publication Date:
Research Org.:
Cornell Univ., Ithaca, NY (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1475190
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:
z-pinch plasmas; plasma radiation source; Kshell radiation production

Citation Formats

Qi, N., Rocco, S. V., Engelbrecht, J., Lavine, E. S., de Grouchy, P., Banasek, J. T., Atoyan, L., Byvank, T., Potter, W. M., Greenly, J. B., Hammer, D. A., Kusse, B. R., Pikuz, S. A., Shelkovenko, T. A., Kroupp, E., Fisher, A., and Maron, Y. Study of Triple Ar Gas Puff Z-Pinches on 0.9-MA, 200-ns COBRA. United States: N. p., 2018. Web. doi:10.1109/TPS.2018.2873663.
Qi, N., Rocco, S. V., Engelbrecht, J., Lavine, E. S., de Grouchy, P., Banasek, J. T., Atoyan, L., Byvank, T., Potter, W. M., Greenly, J. B., Hammer, D. A., Kusse, B. R., Pikuz, S. A., Shelkovenko, T. A., Kroupp, E., Fisher, A., & Maron, Y. Study of Triple Ar Gas Puff Z-Pinches on 0.9-MA, 200-ns COBRA. United States. doi:10.1109/TPS.2018.2873663.
Qi, N., Rocco, S. V., Engelbrecht, J., Lavine, E. S., de Grouchy, P., Banasek, J. T., Atoyan, L., Byvank, T., Potter, W. M., Greenly, J. B., Hammer, D. A., Kusse, B. R., Pikuz, S. A., Shelkovenko, T. A., Kroupp, E., Fisher, A., and Maron, Y. Mon . "Study of Triple Ar Gas Puff Z-Pinches on 0.9-MA, 200-ns COBRA". United States. doi:10.1109/TPS.2018.2873663. https://www.osti.gov/servlets/purl/1475190.
@article{osti_1475190,
title = {Study of Triple Ar Gas Puff Z-Pinches on 0.9-MA, 200-ns COBRA},
author = {Qi, N. and Rocco, S. V. and Engelbrecht, J. and Lavine, E. S. and de Grouchy, P. and Banasek, J. T. and Atoyan, L. and Byvank, T. and Potter, W. M. and Greenly, J. B. and Hammer, D. A. and Kusse, B. R. and Pikuz, S. A. and Shelkovenko, T. A. and Kroupp, E. and Fisher, A. and Maron, Y.},
abstractNote = {Ar gas puff z-pinch experiments were conducted on the 0.9 MA, 200 ns COBRA generator at Cornell University. In the experiments, a triple-nozzle gas valve was used to produce the zpinch load with concentric outer and inner gas puffs and a central gas jet. We used Planer Laser Induced Fluorescence (PLIF) to measure the initial gas profile of the load, two 4-frame 4-ns gated XUV cameras to image the imploding plasma, and filtered Photo- Conducting Diamond Detectors (PCDs) to measure the x-ray output. We have observed shock heating and/or photoionization of the dense center jet by the imploding plasma. With an outer to inner plenum pressure ratio of 1:3, de-acceleration of the imploding plasma occurred when the outer plasma shell imploded on the inner shell resulting in a stable implosion. By varying the plenum pressure for the center jet, the x-ray emission was optimized. In conclusion, an Ar K-shell x-ray (3-4 keV) yield of 77±17 J was produced at a current level of 0.87±0.2 MA and an implosion time of 200-ns.},
doi = {10.1109/TPS.2018.2873663},
journal = {IEEE Transactions on Plasma Science},
issn = {0093-3813},
number = 11,
volume = 46,
place = {United States},
year = {2018},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Figure 1 Figure 1: The triple-nozzle gas puff z-pinch load on COBRA.

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