Use of external magnetic fields in hohlraum plasmas to improve laser-coupling

D. S. Montgomery; B. J. Albright; D. H. Barnak; P. Y. Chang; J. R. Davies; G. Fiksel; D. H. Froula; J. L. Kline; M. J. Macdonald; A. B. Sefkow; L. Yin; R. Betti

doi:10.1063/1.4906055

Use of external magnetic fields in hohlraum plasmas to improve laser-coupling

D. S. Montgomery, B. J. Albright, D. H. Barnak, P. Y. Chang, J. R. Davies, G. Fiksel, D. H. Froula, J. L. Kline, M. J. Macdonald, A. B. Sefkow, L. Yin, R. Betti

Institute of Space and Plasma Sciences

Research output: Contribution to journal › Article › peer-review

47 Citations (Scopus)

Abstract

Efficient coupling of laser energy into hohlraum targets is important for indirect drive ignition. Laser-plasma instabilities can reduce coupling, reduce symmetry, and cause preheat. We consider the effects of an external magnetic field on laser-energy coupling in hohlraum targets. Experiments were performed at the Omega Laser Facility using low-Z gas-filled hohlraum targets which were placed in a magnetic coil with B_z≤7.5-T. We found that an external field B_z=7.5-T aligned along the hohlraum axis results in up to a 50% increase in plasma temperature as measured by Thomson scattering. The experiments were modeled using the 2-D magnetohydrodynamics package in HYDRA and were found to be in good agreement.

Original language	English
Article number	010703
Journal	Physics of Plasmas
Volume	22
Issue number	1
DOIs	https://doi.org/10.1063/1.4906055
Publication status	Published - 2015 Jan 1

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.4906055

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title = "Use of external magnetic fields in hohlraum plasmas to improve laser-coupling",

abstract = "Efficient coupling of laser energy into hohlraum targets is important for indirect drive ignition. Laser-plasma instabilities can reduce coupling, reduce symmetry, and cause preheat. We consider the effects of an external magnetic field on laser-energy coupling in hohlraum targets. Experiments were performed at the Omega Laser Facility using low-Z gas-filled hohlraum targets which were placed in a magnetic coil with Bz≤7.5-T. We found that an external field Bz=7.5-T aligned along the hohlraum axis results in up to a 50% increase in plasma temperature as measured by Thomson scattering. The experiments were modeled using the 2-D magnetohydrodynamics package in HYDRA and were found to be in good agreement.",

author = "Montgomery, {D. S.} and Albright, {B. J.} and Barnak, {D. H.} and Chang, {P. Y.} and Davies, {J. R.} and G. Fiksel and Froula, {D. H.} and Kline, {J. L.} and Macdonald, {M. J.} and Sefkow, {A. B.} and L. Yin and R. Betti",

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T1 - Use of external magnetic fields in hohlraum plasmas to improve laser-coupling

AU - Montgomery, D. S.

AU - Albright, B. J.

AU - Barnak, D. H.

AU - Chang, P. Y.

AU - Davies, J. R.

AU - Fiksel, G.

AU - Froula, D. H.

AU - Kline, J. L.

AU - Macdonald, M. J.

AU - Sefkow, A. B.

AU - Yin, L.

AU - Betti, R.

PY - 2015/1/1

Y1 - 2015/1/1

N2 - Efficient coupling of laser energy into hohlraum targets is important for indirect drive ignition. Laser-plasma instabilities can reduce coupling, reduce symmetry, and cause preheat. We consider the effects of an external magnetic field on laser-energy coupling in hohlraum targets. Experiments were performed at the Omega Laser Facility using low-Z gas-filled hohlraum targets which were placed in a magnetic coil with Bz≤7.5-T. We found that an external field Bz=7.5-T aligned along the hohlraum axis results in up to a 50% increase in plasma temperature as measured by Thomson scattering. The experiments were modeled using the 2-D magnetohydrodynamics package in HYDRA and were found to be in good agreement.

AB - Efficient coupling of laser energy into hohlraum targets is important for indirect drive ignition. Laser-plasma instabilities can reduce coupling, reduce symmetry, and cause preheat. We consider the effects of an external magnetic field on laser-energy coupling in hohlraum targets. Experiments were performed at the Omega Laser Facility using low-Z gas-filled hohlraum targets which were placed in a magnetic coil with Bz≤7.5-T. We found that an external field Bz=7.5-T aligned along the hohlraum axis results in up to a 50% increase in plasma temperature as measured by Thomson scattering. The experiments were modeled using the 2-D magnetohydrodynamics package in HYDRA and were found to be in good agreement.

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ER -

Use of external magnetic fields in hohlraum plasmas to improve laser-coupling

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