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

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

doi:10.1063/1.4906055

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

Journal Article · Tue Jan 13 00:00:00 EST 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4906055· OSTI ID:1236612

Montgomery, D. S. ^[1]; Albright, B. J. ^[1];

^[2]; Chang, P. Y. ^[2]; Davies, J. R. ^[2]; Fiksel, G. ^[2]; Froula, D. H. ^[2]; Kline, J. L. ^[1];

^[3]; Sefkow, A. B. ^[4]; Yin, L. ^[1]; Betti, R. ^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Rochester, Rochester, NY (United States)
Univ. of Michigan, Ann Arbor, MI (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

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. As a result, the experiments were modeled using the 2-D magnetohydrodynamics package in HYDRA and were found to be in good agreement.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1236612

Alternate ID(s):: OSTI ID: 1228487

Report Number(s):: LA-UR-14-28277; PHPAEN

Journal Information:: Physics of Plasmas, Vol. 22, Issue 1; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 43 works

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References (21)

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