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Title: Seeding Magnetic Fields for Laser-Driven Flux Compression in High-Energy-Density Plasmas

Abstract

A compact, self-contained magnetic-seed-field generator (5 to 16 T) is the enabling technology for a novel laser-driven flux-compression scheme in laser-driven targets. A magnetized target is directly irradiated by a kilojoule or megajoule laser to compress the preseeded magnetic field to thousands of teslas. A fast (300 ns), 80 kA current pulse delivered by a portable pulsed-power system is discharged into a low-mass coil that surrounds the laser target. A >15 T target field has been demonstrated using a <100 J capacitor bank, a laser-triggered switch, and a low-impedance (<1 Omega) strip line. The device has been integrated into a series of magnetic-flux-compression experiments on the 60 beam, 30 kJ OMEGA laser [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)]. The initial application is a novel magneto-inertial fusion approach [O. V. Gotchev et al., J. Fusion Energy 27, 25 (2008)] to inertial confinement fusion (ICF), where the amplified magnetic field can inhibit thermal conduction losses from the hot spot of a compressed target. This can lead to the ignition of massive shells imploded with low velocity—a way of reaching higher gains than is possible with conventional ICF.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Laboratory for Laser Energetics, University of Rochester
Sponsoring Org.:
USDOE
OSTI Identifier:
973821
Report Number(s):
DOE/NA/28302-883
2008-180; 1862
DOE Contract Number:  
FC52-08NA28302
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 80; Journal Issue: 4
Country of Publication:
United States
Language:
English

Citation Formats

Gotchev, O.V., Knauer, J.P., Chang, P.Y., Jang, N.W., Shoup III, M.J., Meyerhofer, D.D., and Betti, R. Seeding Magnetic Fields for Laser-Driven Flux Compression in High-Energy-Density Plasmas. United States: N. p., 2010. Web.
Gotchev, O.V., Knauer, J.P., Chang, P.Y., Jang, N.W., Shoup III, M.J., Meyerhofer, D.D., & Betti, R. Seeding Magnetic Fields for Laser-Driven Flux Compression in High-Energy-Density Plasmas. United States.
Gotchev, O.V., Knauer, J.P., Chang, P.Y., Jang, N.W., Shoup III, M.J., Meyerhofer, D.D., and Betti, R. Tue . "Seeding Magnetic Fields for Laser-Driven Flux Compression in High-Energy-Density Plasmas". United States.
@article{osti_973821,
title = {Seeding Magnetic Fields for Laser-Driven Flux Compression in High-Energy-Density Plasmas},
author = {Gotchev, O.V. and Knauer, J.P. and Chang, P.Y. and Jang, N.W. and Shoup III, M.J. and Meyerhofer, D.D. and Betti, R.},
abstractNote = {A compact, self-contained magnetic-seed-field generator (5 to 16 T) is the enabling technology for a novel laser-driven flux-compression scheme in laser-driven targets. A magnetized target is directly irradiated by a kilojoule or megajoule laser to compress the preseeded magnetic field to thousands of teslas. A fast (300 ns), 80 kA current pulse delivered by a portable pulsed-power system is discharged into a low-mass coil that surrounds the laser target. A >15 T target field has been demonstrated using a <100 J capacitor bank, a laser-triggered switch, and a low-impedance (<1 Omega) strip line. The device has been integrated into a series of magnetic-flux-compression experiments on the 60 beam, 30 kJ OMEGA laser [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)]. The initial application is a novel magneto-inertial fusion approach [O. V. Gotchev et al., J. Fusion Energy 27, 25 (2008)] to inertial confinement fusion (ICF), where the amplified magnetic field can inhibit thermal conduction losses from the hot spot of a compressed target. This can lead to the ignition of massive shells imploded with low velocity—a way of reaching higher gains than is possible with conventional ICF.},
doi = {},
journal = {Review of Scientific Instruments},
number = 4,
volume = 80,
place = {United States},
year = {2010},
month = {3}
}