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Title: Stabilization of Liner Implosions via a Dynamic Screw Pinch

Abstract

Magnetically driven implosions are susceptible to magnetohydrodynamic instabilities, including the magneto-Rayleigh-Taylor instability (MRTI). To reduce MRTI growth in solid-metal liner implo-sions, the use of a dynamic screw pinch (DSP) has been proposed [P. F. Schmit et al., Phys. Rev. Lett. 117, 205001 (2016)]. In a DSP con guration, a helical return-current structure surrounds the liner, resulting in a helical magnetic eld that drives the implosion. Here, we present the rst experimental tests of a solid-metal liner implosion driven by a DSP. Using the 1-MA, 100{200-ns COBRA pulsed-power driver, we tested three DSP cases (with peak axial magnetic elds of 2 T, 14 T, and 20 T) and a standard z-pinch (SZP) case (with a straight return-current structure and thus zero axial eld). The liners had an initial radius of 3.2 mm and were made from 650-nm-thick aluminum foil. Images collected during the experiments reveal that helical MRTI modes developed in the DSP cases, while non-helical (azimuthally symmetric) MRTI modes developed in the SZP case. Additionally, the MRTI amplitudes for the 14-T and 20-T DSP cases were smaller than in the SZP case. Speci cally, when the liner had imploded to half of its initial radius, the MRTI amplitudes for themore » SZP case and for the 14-T and 20-T DSP cases were, respectively, 1.1-0.3 mm, 0.7-0.2 mm, and 0.3-0.1 mm. Relative to the SZP, the stabilization obtained using the DSP agrees reasonably well with theoretical estimates.« less

Authors:
 [1];  [1]; ORCiD logo [1];  [1];  [2];  [3];  [3]; ORCiD logo [3];  [3]; ORCiD logo [3]; ORCiD logo [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  3. Cornell Univ., Ithaca, NY (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1634186
Alternate Identifier(s):
OSTI ID: 1670176
Report Number(s):
SAND-2020-6042J
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US2201300
Grant/Contract Number:  
NA0003764; AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 125; Journal Issue: 3; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Campbell, Paul C., Jones, T. M., Woolstrum, J. M., Jordan, N. M., Schmit, P. F., Greenly, J. B., Potter, W. M., Lavine, E. S., Kusse, B. R., Hammer, D. A., and McBride, R. D. Stabilization of Liner Implosions via a Dynamic Screw Pinch. United States: N. p., 2020. Web. doi:10.1103/PhysRevLett.125.035001.
Campbell, Paul C., Jones, T. M., Woolstrum, J. M., Jordan, N. M., Schmit, P. F., Greenly, J. B., Potter, W. M., Lavine, E. S., Kusse, B. R., Hammer, D. A., & McBride, R. D. Stabilization of Liner Implosions via a Dynamic Screw Pinch. United States. https://doi.org/10.1103/PhysRevLett.125.035001
Campbell, Paul C., Jones, T. M., Woolstrum, J. M., Jordan, N. M., Schmit, P. F., Greenly, J. B., Potter, W. M., Lavine, E. S., Kusse, B. R., Hammer, D. A., and McBride, R. D. Thu . "Stabilization of Liner Implosions via a Dynamic Screw Pinch". United States. https://doi.org/10.1103/PhysRevLett.125.035001. https://www.osti.gov/servlets/purl/1634186.
@article{osti_1634186,
title = {Stabilization of Liner Implosions via a Dynamic Screw Pinch},
author = {Campbell, Paul C. and Jones, T. M. and Woolstrum, J. M. and Jordan, N. M. and Schmit, P. F. and Greenly, J. B. and Potter, W. M. and Lavine, E. S. and Kusse, B. R. and Hammer, D. A. and McBride, R. D.},
abstractNote = {Magnetically driven implosions are susceptible to magnetohydrodynamic instabilities, including the magneto-Rayleigh-Taylor instability (MRTI). To reduce MRTI growth in solid-metal liner implo-sions, the use of a dynamic screw pinch (DSP) has been proposed [P. F. Schmit et al., Phys. Rev. Lett. 117, 205001 (2016)]. In a DSP con guration, a helical return-current structure surrounds the liner, resulting in a helical magnetic eld that drives the implosion. Here, we present the rst experimental tests of a solid-metal liner implosion driven by a DSP. Using the 1-MA, 100{200-ns COBRA pulsed-power driver, we tested three DSP cases (with peak axial magnetic elds of 2 T, 14 T, and 20 T) and a standard z-pinch (SZP) case (with a straight return-current structure and thus zero axial eld). The liners had an initial radius of 3.2 mm and were made from 650-nm-thick aluminum foil. Images collected during the experiments reveal that helical MRTI modes developed in the DSP cases, while non-helical (azimuthally symmetric) MRTI modes developed in the SZP case. Additionally, the MRTI amplitudes for the 14-T and 20-T DSP cases were smaller than in the SZP case. Speci cally, when the liner had imploded to half of its initial radius, the MRTI amplitudes for the SZP case and for the 14-T and 20-T DSP cases were, respectively, 1.1-0.3 mm, 0.7-0.2 mm, and 0.3-0.1 mm. Relative to the SZP, the stabilization obtained using the DSP agrees reasonably well with theoretical estimates.},
doi = {10.1103/PhysRevLett.125.035001},
journal = {Physical Review Letters},
number = 3,
volume = 125,
place = {United States},
year = {Thu Jul 16 00:00:00 EDT 2020},
month = {Thu Jul 16 00:00:00 EDT 2020}
}

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