Higher velocity, high-foot implosions on the National Ignition Facility laser

Callahan, D. A.; Hurricane, O. A.; Hinkel, D. E.; Döppner, T.; Ma, T.; Park, H. -S.; Barrios Garcia, M. A.; Berzak Hopkins, L. F.; Casey, D. T.; Cerjan, C. J.; Dewald, E. L.; Dittrich, T. R.; Edwards, M. J.; Haan, S. W.; Hamza, A. V.; Kline, J. L.; Knauer, J. P.; Kritcher, A. L.; Landen, O. L.; LePape, S.; MacPhee, A. G.; Milovich, J. L.; Nikroo, A.; Pak, A. E.; Patel, P. K.; Rygg, J. R.; Ralph, J. E.; Salmonson, J. D.; Spears, B. K.; Springer, P. T.; Tommasini, R.; Benedetti, L. R.; Bionta, R. M.; Bond, E. J.; Bradley, D. K.; Caggiano, J. A.; Field, J. E.; Fittinghoff, D. N.; Frenje, J.; Johnson, M. Gatu; Grim, G. P.; Hatarik, R.; Merrill, F. E.; Nagel, S. R.; Izumi, N.; Khan, S. F.; Town, R. J.; Sayre, D. B.; Volegov, P.; Wilde, C. H.

doi:10.1063/1.4921144

Title: Higher velocity, high-foot implosions on the National Ignition Facility laser

Journal Article · Fri May 15 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4921144· OSTI ID:1810643

^[1]; Hurricane, O. A. ^[1]; Hinkel, D. E. ^[1]; Döppner, T. ^[1]; Ma, T. ^[1]; Park, H. -S. ^[1]; Barrios Garcia, M. A. ^[1];

^[1]; Casey, D. T. ^[1];

^[1]; Dewald, E. L. ^[1]; Dittrich, T. R. ^[1]; Edwards, M. J. ^[1];

^[1]; Hamza, A. V. ^[1]; Kline, J. L. ^[2]; Knauer, J. P. ^[3]; Kritcher, A. L. ^[1]; Landen, O. L. ^[1]; LePape, S. ^[1] more »

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Rochester, NY (United States)
General Atomics, San Diego, CA (United States)
MIT (Massachusetts Inst. of Technology), Cambridge, MA (United States)

By increasing the velocity in “high foot” implosions [Dittrich et al., Phys. Rev. Lett. 112, 055002 (2014); Park et al., Phys. Rev. Lett. 112, 055001 (2014); Hurricane et al., Nature 506, 343 (2014); Hurricane et al., Phys. Plasmas 21, 056314 (2014)] on the National Ignition Facility laser, we have nearly doubled the neutron yield and the hotspot pressure as compared to the implosions reported upon last year. The implosion velocity has been increased using a combination of the laser (higher power and energy), the hohlraum (depleted uranium wall material with higher opacity and lower specific heat than gold hohlraums), and the capsule (thinner capsules with less mass). We find that the neutron yield from these experiments scales systematically with a velocity-like parameter of the square root of the laser energy divided by the ablator mass. By connecting this parameter with the inferred implosion velocity (v), we find that for shots with primary yield >1e15 neutrons, the total yield ~ v⁹˙⁴. This increase is considerably faster than the expected dependence for implosions without alpha heating ( ~v⁵˙⁹) and is additional evidence that these experiments have significant alpha heating.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344; NA0001857

OSTI ID:: 1810643

Alternate ID(s):: OSTI ID: 1183037; OSTI ID: 1228247

Report Number(s):: LLNL-JRNL-665608; 786988; TRN: US2213064

Journal Information:: Physics of Plasmas, Vol. 22, Issue 5; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 47 works

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References (32)

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Three-dimensional simulations of low foot and high foot implosion experiments on the National Ignition Facility Clark, D. S.; Weber, C. R.; Milovich, J. L. Physics of Plasmas, Vol. 23, Issue 5 https://doi.org/10.1063/1.4943527	journal	March 2016
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Title: Higher velocity, high-foot implosions on the National Ignition Facility laser

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