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 »
- Authors:
-
- Univ. of Michigan, Ann Arbor, MI (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- 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}
}
Web of Science
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