Near-vacuum hohlraums for driving fusion implosions with high density carbon ablatorsa)

Berzak Hopkins, L. F.; Le Pape, S.; Divol, L.; Meezan, N. B.; Mackinnon, A. J.; Ho, D. D.; Jones, O. S.; Khan, S.; Milovich, J. L.; Ross, J. S.; Amendt, P.; Casey, D.; Celliers, P. M.; Pak, A.; Peterson, J. L.; Ralph, J.; Rygg, J. R.

doi:10.1063/1.4921151

Near-vacuum hohlraums for driving fusion implosions with high density carbon ablatorsa)

Journal Article · Wed May 20 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4921151· OSTI ID:1771032

^[1]; Le Pape, S. ^[1]; Divol, L. ^[1]; Meezan, N. B. ^[1]; Mackinnon, A. J. ^[1]; Ho, D. D. ^[1]; Jones, O. S. ^[1]; Khan, S. ^[1]; Milovich, J. L. ^[1]; Ross, J. S. ^[1]; Amendt, P. ^[1]; Casey, D. ^[1]; Celliers, P. M. ^[1]; Pak, A. ^[1]; ^[1]; Ralph, J. ^[1]; Rygg, J. R. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Recent experiments at the National Ignition Facility [M. J. Edwards et al., Phys. Plasmas 20, 070501 (2013)] have explored driving high-density carbon ablators with near-vacuum hohlraums, which use a minimal amount of helium gas fill. These hohlraums show improved efficiency relative to conventional gas-filled hohlraums in terms of minimal backscatter, minimal generation of suprathermal electrons, and increased hohlraum-capsule coupling. Given these advantages, near-vacuum hohlraums are a promising choice for pursuing high neutron yield implosions. Long pulse symmetry control, though, remains a challenge, as the hohlraum volume fills with material. Here, two mitigation methodologies have been explored, dynamic beam phasing and increased case-to-capsule ratio (larger hohlraum size relative to capsule). Unexpectedly, experiments have demonstrated that the inner laser beam propagation is better than predicted by nominal simulations, and an enhanced beam propagation model is required to match measured hot spot symmetry. Ongoing work is focused on developing a physical model which captures this enhanced propagation and on utilizing the enhanced propagation to drive longer laser pulses than originally predicted in order to reach alpha-heating dominated neutron yields.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

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

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1771032

Alternate ID(s):: OSTI ID: 1228305

Report Number(s):: LLNL-JRNL--666580; 787308

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

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

Country of Publication:: United States

Language:: English

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