Implosion of auto-magnetizing helical liners on the Z facility
Abstract
In the first auto-magnetizing liner implosion experiments on the Z Facility, precompressed internal axial fields near 150 T were measured and 7.2-keV radiography indicated a high level of cylindrical uniformity of the imploding liner's inner surface. An auto-magnetizing (AutoMag) liner is made of discrete metallic helical conductors encapsulated in insulating material. Here, the liner generates internal axial magnetic field as a 1–2 MA, 100–200 ns current prepulse flows through the helical conductors. After the prepulse, the fast-rising main current pulse causes the insulating material between the metallic helices to break down ceasing axial field production. After breakdown, the helical liner, nonuniform in both density and electrical conductivity, implodes in 100 ns. In-flight radiography data demonstrate that while the inner wall maintains cylindrical uniformity, multiple new helically oriented structures are self-generated within the outer liner material layers during the implosion; this was not predicted by simulations. Furthermore, liner stagnation was delayed compared to simulation predictions. An analytical implosion model is compared with experimental data and preshot simulations to explore how changes in the premagnetization field strength and drive current affect the liner implosion trajectory. Both the measurement of >100 T internal axial field production and the demonstration of cylindrical uniformity ofmore »
- Authors:
-
[1];
[2];
[2]
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of New Mexico, Albuquerque, NM (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:
- 1515210
- Alternate Identifier(s):
- OSTI ID: 1513053
- Report Number(s):
- SAND-2019-4825J
Journal ID: ISSN 1070-664X; 675121
- Grant/Contract Number:
- AC04-94AL85000; NA0003525; 195306; 200269
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 26; Journal Issue: 5; 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
Shipley, Gabriel A., Awe, Thomas James, Hutsel, Brian Thomas, Greenly, John B., Jennings, Christopher Ashley, and Slutz, Stephen A. Implosion of auto-magnetizing helical liners on the Z facility. United States: N. p., 2019.
Web. doi:10.1063/1.5089468.
Shipley, Gabriel A., Awe, Thomas James, Hutsel, Brian Thomas, Greenly, John B., Jennings, Christopher Ashley, & Slutz, Stephen A. Implosion of auto-magnetizing helical liners on the Z facility. United States. https://doi.org/10.1063/1.5089468
Shipley, Gabriel A., Awe, Thomas James, Hutsel, Brian Thomas, Greenly, John B., Jennings, Christopher Ashley, and Slutz, Stephen A. Thu .
"Implosion of auto-magnetizing helical liners on the Z facility". United States. https://doi.org/10.1063/1.5089468. https://www.osti.gov/servlets/purl/1515210.
@article{osti_1515210,
title = {Implosion of auto-magnetizing helical liners on the Z facility},
author = {Shipley, Gabriel A. and Awe, Thomas James and Hutsel, Brian Thomas and Greenly, John B. and Jennings, Christopher Ashley and Slutz, Stephen A.},
abstractNote = {In the first auto-magnetizing liner implosion experiments on the Z Facility, precompressed internal axial fields near 150 T were measured and 7.2-keV radiography indicated a high level of cylindrical uniformity of the imploding liner's inner surface. An auto-magnetizing (AutoMag) liner is made of discrete metallic helical conductors encapsulated in insulating material. Here, the liner generates internal axial magnetic field as a 1–2 MA, 100–200 ns current prepulse flows through the helical conductors. After the prepulse, the fast-rising main current pulse causes the insulating material between the metallic helices to break down ceasing axial field production. After breakdown, the helical liner, nonuniform in both density and electrical conductivity, implodes in 100 ns. In-flight radiography data demonstrate that while the inner wall maintains cylindrical uniformity, multiple new helically oriented structures are self-generated within the outer liner material layers during the implosion; this was not predicted by simulations. Furthermore, liner stagnation was delayed compared to simulation predictions. An analytical implosion model is compared with experimental data and preshot simulations to explore how changes in the premagnetization field strength and drive current affect the liner implosion trajectory. Both the measurement of >100 T internal axial field production and the demonstration of cylindrical uniformity of the imploding liner's inner wall are encouraging for promoting the use of AutoMag liners in future MagLIF experiments.},
doi = {10.1063/1.5089468},
journal = {Physics of Plasmas},
number = 5,
volume = 26,
place = {United States},
year = {Thu May 16 00:00:00 EDT 2019},
month = {Thu May 16 00:00:00 EDT 2019}
}
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Works referenced in this record:
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Works referencing / citing this record:
Design of dynamic screw pinch experiments for magnetized liner inertial fusion
journal, October 2019
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