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Title: Study of stability in a liner-on-target gas puff Z-pinch as a function of pre-embedded axial magnetic field

Abstract

Gas puff Z-pinches are intense sources of X-rays and neutrons but are highly susceptible to the magneto-Rayleigh-Taylor instability (MRTI). MRTI mitigation is critical for optimal and reproducible yields, motivating significant attention toward various potential mitigation mechanisms. One such approach is the external application of an axial magnetic field, which will be discussed here in the context of recent experiments on the Zebra generator (1 MA, 100 ns) at the University of Nevada, Reno. In these experiments, an annular Kr gas liner is imploded onto an on-axis deuterium target with a pre-embedded axial magnetic field Bz0 ranging from 0 to 0.3 T. The effect of Bz0 on the stability of the Kr liner is evaluated with measurements of plasma radius, overall instability amplitude, and dominant instability wavelength at different times obtained from time-gated extreme ultraviolet pinhole images. It was observed that the external axial magnetic field does not affect the implosion velocity significantly and that it reduces the overall instability amplitude and the presence of short-wavelength modes, indicating improved pinch stability and reproducibility. For the highest applied Bz0 = 0.3 T, the stagnation radius measured via visible streak images was found to increase. These findings are consistent with experiments reported inmore » the literature, but here, the Bz0 required for stability, Bz0 = 0.13 Ipk=R0 (where Ipk is the driver peak current and R0 is the initial radius), is lower. This could be attributed to the smaller load geometry, both radially and axially. Consistent with other experiments, the cause of decreased convergence cannot be explained by the additional axial magnetic pressure and remains an open question.« less

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [3];  [4];  [5];  [5];  [1]
+ Show Author Affiliations
  1. Univ. of California, San Diego, CA (United States)
  2. Univ. of California, San Diego, CA (United States); Pontifical Catholic Univ. of Chile, Santiago (Chile)
  3. Magneto-Inertial Fusion Technologies, Inc., Tustin, CA (United States)
  4. Univ. of Nevada, Reno, NV (United States); Livermore Operations, Livermore, CA (United States)
  5. Univ. of Nevada, Reno, NV (United States)
Publication Date:
Research Org.:
Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Advanced Research Projects Agency - Energy (ARPA-E)
OSTI Identifier:
1633887
Alternate Identifier(s):
OSTI ID: 1581845
Grant/Contract Number:  
NA0003842; AR0000569
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 27; Journal Issue: 1; 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

Conti, F., Aybar, N., Narkis, J., Valenzuela, J. C., Rahman, H. U., Ruskov, E., Dutra, E., Haque, S., Covington, A., and Beg, F. N. Study of stability in a liner-on-target gas puff Z-pinch as a function of pre-embedded axial magnetic field. United States: N. p., 2020. Web. doi:10.1063/1.5131170.
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Conti, F., Aybar, N., Narkis, J., Valenzuela, J. C., Rahman, H. U., Ruskov, E., Dutra, E., Haque, S., Covington, A., & Beg, F. N. Study of stability in a liner-on-target gas puff Z-pinch as a function of pre-embedded axial magnetic field. United States. https://doi.org/10.1063/1.5131170
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Conti, F., Aybar, N., Narkis, J., Valenzuela, J. C., Rahman, H. U., Ruskov, E., Dutra, E., Haque, S., Covington, A., and Beg, F. N. Thu . "Study of stability in a liner-on-target gas puff Z-pinch as a function of pre-embedded axial magnetic field". United States. https://doi.org/10.1063/1.5131170. https://www.osti.gov/servlets/purl/1633887.
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@article{osti_1633887,
title = {Study of stability in a liner-on-target gas puff Z-pinch as a function of pre-embedded axial magnetic field},
author = {Conti, F. and Aybar, N. and Narkis, J. and Valenzuela, J. C. and Rahman, H. U. and Ruskov, E. and Dutra, E. and Haque, S. and Covington, A. and Beg, F. N.},
abstractNote = {Gas puff Z-pinches are intense sources of X-rays and neutrons but are highly susceptible to the magneto-Rayleigh-Taylor instability (MRTI). MRTI mitigation is critical for optimal and reproducible yields, motivating significant attention toward various potential mitigation mechanisms. One such approach is the external application of an axial magnetic field, which will be discussed here in the context of recent experiments on the Zebra generator (1 MA, 100 ns) at the University of Nevada, Reno. In these experiments, an annular Kr gas liner is imploded onto an on-axis deuterium target with a pre-embedded axial magnetic field Bz0 ranging from 0 to 0.3 T. The effect of Bz0 on the stability of the Kr liner is evaluated with measurements of plasma radius, overall instability amplitude, and dominant instability wavelength at different times obtained from time-gated extreme ultraviolet pinhole images. It was observed that the external axial magnetic field does not affect the implosion velocity significantly and that it reduces the overall instability amplitude and the presence of short-wavelength modes, indicating improved pinch stability and reproducibility. For the highest applied Bz0 = 0.3 T, the stagnation radius measured via visible streak images was found to increase. These findings are consistent with experiments reported in the literature, but here, the Bz0 required for stability, Bz0 = 0.13 Ipk=R0 (where Ipk is the driver peak current and R0 is the initial radius), is lower. This could be attributed to the smaller load geometry, both radially and axially. Consistent with other experiments, the cause of decreased convergence cannot be explained by the additional axial magnetic pressure and remains an open question.},
doi = {10.1063/1.5131170},
journal = {Physics of Plasmas},
number = 1,
volume = 27,
place = {United States},
year = {Thu Jan 09 00:00:00 EST 2020},
month = {Thu Jan 09 00:00:00 EST 2020}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1063/1.5131170
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Cited by: 11 works
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Figures / Tables:

FIG. 1 FIG. 1: Cross-sectional sketch of the SZP experiment load on the Zebra machine. The following elements are labeled: 1 = machine cathode, 2 = machine anode (gas injector), 3 = current return cage, 4 = liner gas valve plenum, 5 = target gas valve plenum, and 6 = axial magneticmore » field coils.« less
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    FIG. 1 (p. 4)figure
    FIG. 2 (p. 4)figure
    FIG. 3 (p. 5)figure
    FIG. 4 (p. 6)figure
    FIG. 5 (p. 7)figure
    FIG. 6 (p. 7)figure
    FIG. 7 (p. 8)figure
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