Axial magnetic field injection in magnetized liner inertial fusion
Abstract
MagLIF is a fusion concept using a Z-pinch implosion to reach thermonuclear fusion. In current experiments, the implosion is driven by the Z-machine using 19 MA of electrical current with a rise time of 100 ns. MagLIF requires an initial axial magnetic field of 30 T to reduce heat losses to the liner wall during compression and to confine alpha particles during fusion burn. This field is generated well before the current ramp starts and needs to penetrate the transmission lines of the pulsed-power generator, as well as the liner itself. Consequently, the axial field rise time must exceed hundreds of microseconds. Any coil capable of being submitted to such a field for that length of time is inevitably bulky. The space required to fit the coil near the liner, increases the inductance of the load. In turn, the total current delivered to the load decreases since the voltage is limited by driver design. Yet, the large amount of current provided by the Z-machine can be used to produce the required 30 T field by tilting the return current posts surrounding the liner, eliminating the need for a separate coil. However, the problem now is the field penetration time, acrossmore »
- Authors:
-
- Univ. of Rochester, Rochester, NY (United States)
- Cornell Univ., Ithaca, NY (United States)
- Publication Date:
- Research Org.:
- Univ. of Rochester, NY (United States)
- Sponsoring Org.:
- USDOE Advanced Research Projects Agency - Energy (ARPA-E)
- OSTI Identifier:
- 1515030
- Alternate Identifier(s):
- OSTI ID: 1406140
- Grant/Contract Number:
- SC0016252; AR000056
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 24; Journal Issue: 10; 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
Gourdain, P. -A., Adams, M. B., Davies, J. R., and Seyler, C. E. Axial magnetic field injection in magnetized liner inertial fusion. United States: N. p., 2017.
Web. doi:10.1063/1.4986640.
Gourdain, P. -A., Adams, M. B., Davies, J. R., & Seyler, C. E. Axial magnetic field injection in magnetized liner inertial fusion. United States. https://doi.org/10.1063/1.4986640
Gourdain, P. -A., Adams, M. B., Davies, J. R., and Seyler, C. E. Tue .
"Axial magnetic field injection in magnetized liner inertial fusion". United States. https://doi.org/10.1063/1.4986640. https://www.osti.gov/servlets/purl/1515030.
@article{osti_1515030,
title = {Axial magnetic field injection in magnetized liner inertial fusion},
author = {Gourdain, P. -A. and Adams, M. B. and Davies, J. R. and Seyler, C. E.},
abstractNote = {MagLIF is a fusion concept using a Z-pinch implosion to reach thermonuclear fusion. In current experiments, the implosion is driven by the Z-machine using 19 MA of electrical current with a rise time of 100 ns. MagLIF requires an initial axial magnetic field of 30 T to reduce heat losses to the liner wall during compression and to confine alpha particles during fusion burn. This field is generated well before the current ramp starts and needs to penetrate the transmission lines of the pulsed-power generator, as well as the liner itself. Consequently, the axial field rise time must exceed hundreds of microseconds. Any coil capable of being submitted to such a field for that length of time is inevitably bulky. The space required to fit the coil near the liner, increases the inductance of the load. In turn, the total current delivered to the load decreases since the voltage is limited by driver design. Yet, the large amount of current provided by the Z-machine can be used to produce the required 30 T field by tilting the return current posts surrounding the liner, eliminating the need for a separate coil. However, the problem now is the field penetration time, across the liner wall. This paper discusses why skin effect arguments do not hold in the presence of resistivity gradients. Numerical simulations show that fields larger than 30 T can diffuse across the liner wall in less than 60 ns, demonstrating that external coils can be replaced by return current posts with optimal helicity.},
doi = {10.1063/1.4986640},
journal = {Physics of Plasmas},
number = 10,
volume = 24,
place = {United States},
year = {Tue Oct 31 00:00:00 EDT 2017},
month = {Tue Oct 31 00:00:00 EDT 2017}
}
Web of Science
Figures / Tables:
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Figures / Tables found in this record: