Compressing magnetic fields with high-energy lasers

J. P. Knauer; O. V. Gotchev; P. Y. Chang; D. D. Meyerhofer; O. Polomarov; R. Betti; J. A. Frenje; C. K. Li; M. J.E. Manuel; R. D. Petrasso; J. R. Rygg; F. H. Śguin

doi:10.1063/1.3416557

Compressing magnetic fields with high-energy lasers

J. P. Knauer, O. V. Gotchev, P. Y. Chang, D. D. Meyerhofer, O. Polomarov, R. Betti, J. A. Frenje, C. K. Li, M. J.E. Manuel, R. D. Petrasso, J. R. Rygg, F. H. Śguin

Institute of Space and Plasma Sciences

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Abstract

Laser-driven magnetic-field compression producing a magnetic field of tens of megaGauss is reported for the first time. A shock wave formed during the implosion of a cylindrical target traps an initial (seed) magnetic field that is amplified via conservation of magnetic flux. Such large fields are expected to magnetize the electrons in the hot, central plasma, leading to a cyclotron frequency exceeding the collision frequency. The Omega Laser Facility [T. R. Boehly, Opt. Commun. 133, 495 (1997)] was used to implode cylindrical CH targets filled with deuterium gas and seeded with an external field (>50 kG) from a magnetic pulse generator. This seed field is trapped and rapidly compressed by the imploding shell, minimizing the effect of resistive flux diffusion. The compressed field was probed via proton deflectrometry using 14.7 MeV protons from the D+ H3 e fusion reaction emitted by an imploding glass microballoon. Line-averaged magnetic fields of the imploded core were measured to between 30 and 40 MG. Experimental data were analyzed with both a magnetohydrodynamic version of the one-dimensional hydrocode LILAC [J. Delettrez, Phys. Rev. A 36, 3926 (1987); N. W. Jang, Bull. Am. Phys. Soc. 51, 144 (2006)] and the particle propagation code GEANT4 [S. Agostinelli, Nucl. Instrum. Methods Phys. Res. A 506, 250 (2003)].

Original language	English
Article number	056318
Journal	Physics of Plasmas
Volume	17
Issue number	5
DOIs	https://doi.org/10.1063/1.3416557
Publication status	Published - 2010 May

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.3416557

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@article{52371ee749f24bd4bbab8a0c76e02c9a,

title = "Compressing magnetic fields with high-energy lasers",

abstract = "Laser-driven magnetic-field compression producing a magnetic field of tens of megaGauss is reported for the first time. A shock wave formed during the implosion of a cylindrical target traps an initial (seed) magnetic field that is amplified via conservation of magnetic flux. Such large fields are expected to magnetize the electrons in the hot, central plasma, leading to a cyclotron frequency exceeding the collision frequency. The Omega Laser Facility [T. R. Boehly, Opt. Commun. 133, 495 (1997)] was used to implode cylindrical CH targets filled with deuterium gas and seeded with an external field (>50 kG) from a magnetic pulse generator. This seed field is trapped and rapidly compressed by the imploding shell, minimizing the effect of resistive flux diffusion. The compressed field was probed via proton deflectrometry using 14.7 MeV protons from the D+ H3 e fusion reaction emitted by an imploding glass microballoon. Line-averaged magnetic fields of the imploded core were measured to between 30 and 40 MG. Experimental data were analyzed with both a magnetohydrodynamic version of the one-dimensional hydrocode LILAC [J. Delettrez, Phys. Rev. A 36, 3926 (1987); N. W. Jang, Bull. Am. Phys. Soc. 51, 144 (2006)] and the particle propagation code GEANT4 [S. Agostinelli, Nucl. Instrum. Methods Phys. Res. A 506, 250 (2003)].",

author = "Knauer, {J. P.} and Gotchev, {O. V.} and Chang, {P. Y.} and Meyerhofer, {D. D.} and O. Polomarov and R. Betti and Frenje, {J. A.} and Li, {C. K.} and Manuel, {M. J.E.} and Petrasso, {R. D.} and Rygg, {J. R.} and {\'S}guin, {F. H.}",

note = "Funding Information: The authors thank Dr. F. Y. Thio and Dr. A. Velikovich for many illuminating discussions and for their encouragement in pursuing these novel experiments. This work was supported by the U.S. Department of Energy under Grant No. DE-FG02-04ER54768 and Cooperative Agreement Nos. DE-FC02-ER54789 and DE-FC52-08NA28302, the University of Rochester, and the New York State Energy Research and Development Authority. ",

year = "2010",

month = may,

doi = "10.1063/1.3416557",

language = "English",

volume = "17",

journal = "Physics of Plasmas",

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publisher = "American Institute of Physics Publising LLC",

number = "5",

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T1 - Compressing magnetic fields with high-energy lasers

AU - Knauer, J. P.

AU - Gotchev, O. V.

AU - Chang, P. Y.

AU - Meyerhofer, D. D.

AU - Polomarov, O.

AU - Betti, R.

AU - Frenje, J. A.

AU - Li, C. K.

AU - Manuel, M. J.E.

AU - Petrasso, R. D.

AU - Rygg, J. R.

AU - Śguin, F. H.

N1 - Funding Information: The authors thank Dr. F. Y. Thio and Dr. A. Velikovich for many illuminating discussions and for their encouragement in pursuing these novel experiments. This work was supported by the U.S. Department of Energy under Grant No. DE-FG02-04ER54768 and Cooperative Agreement Nos. DE-FC02-ER54789 and DE-FC52-08NA28302, the University of Rochester, and the New York State Energy Research and Development Authority.

PY - 2010/5

Y1 - 2010/5

N2 - Laser-driven magnetic-field compression producing a magnetic field of tens of megaGauss is reported for the first time. A shock wave formed during the implosion of a cylindrical target traps an initial (seed) magnetic field that is amplified via conservation of magnetic flux. Such large fields are expected to magnetize the electrons in the hot, central plasma, leading to a cyclotron frequency exceeding the collision frequency. The Omega Laser Facility [T. R. Boehly, Opt. Commun. 133, 495 (1997)] was used to implode cylindrical CH targets filled with deuterium gas and seeded with an external field (>50 kG) from a magnetic pulse generator. This seed field is trapped and rapidly compressed by the imploding shell, minimizing the effect of resistive flux diffusion. The compressed field was probed via proton deflectrometry using 14.7 MeV protons from the D+ H3 e fusion reaction emitted by an imploding glass microballoon. Line-averaged magnetic fields of the imploded core were measured to between 30 and 40 MG. Experimental data were analyzed with both a magnetohydrodynamic version of the one-dimensional hydrocode LILAC [J. Delettrez, Phys. Rev. A 36, 3926 (1987); N. W. Jang, Bull. Am. Phys. Soc. 51, 144 (2006)] and the particle propagation code GEANT4 [S. Agostinelli, Nucl. Instrum. Methods Phys. Res. A 506, 250 (2003)].

AB - Laser-driven magnetic-field compression producing a magnetic field of tens of megaGauss is reported for the first time. A shock wave formed during the implosion of a cylindrical target traps an initial (seed) magnetic field that is amplified via conservation of magnetic flux. Such large fields are expected to magnetize the electrons in the hot, central plasma, leading to a cyclotron frequency exceeding the collision frequency. The Omega Laser Facility [T. R. Boehly, Opt. Commun. 133, 495 (1997)] was used to implode cylindrical CH targets filled with deuterium gas and seeded with an external field (>50 kG) from a magnetic pulse generator. This seed field is trapped and rapidly compressed by the imploding shell, minimizing the effect of resistive flux diffusion. The compressed field was probed via proton deflectrometry using 14.7 MeV protons from the D+ H3 e fusion reaction emitted by an imploding glass microballoon. Line-averaged magnetic fields of the imploded core were measured to between 30 and 40 MG. Experimental data were analyzed with both a magnetohydrodynamic version of the one-dimensional hydrocode LILAC [J. Delettrez, Phys. Rev. A 36, 3926 (1987); N. W. Jang, Bull. Am. Phys. Soc. 51, 144 (2006)] and the particle propagation code GEANT4 [S. Agostinelli, Nucl. Instrum. Methods Phys. Res. A 506, 250 (2003)].

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Compressing magnetic fields with high-energy lasers

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