Hydrodynamic instability growth and mix experiments at the National Ignition Facility

Smalyuk, V. A.; Barrios, M.; Caggiano, J. A.; Casey, D. T.; Cerjan, C. J.; Clark, D. S.; Edwards, M. J.; Frenje, J. A.; Gatu-Johnson, M.; Glebov, V. Y.; Grim, G.; Haan, S. W.; Hammel, B. A.; Hamza, A.; Hoover, D. E.; Hsing, W. W.; Hurricane, O.; Kilkenny, J. D.; Kline, J. L.; Knauer, J. P.; Kroll, J.; Landen, O. L.; Lindl, J. D.; Ma, T.; McNaney, J. M.; Mintz, M.; Moore, A.; Nikroo, A.; Parham, T.; Peterson, J. L.; Petrasso, R.; Pickworth, L.; Pino, J. E.; Raman, K.; Regan, S. P.; Remington, B. A.; Robey, H. F.; Rowley, D. P.; Sayre, D. B.; Tipton, R. E.; Weber, S. V.; Widmann, K.; Wilson, D. C.; Yeamans, C. B.

doi:10.1063/1.4872026

Hydrodynamic instability growth and mix experiments at the National Ignition Facility

Journal Article · Tue Apr 22 00:00:00 EDT 2014 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4872026· OSTI ID:1229809

Smalyuk, V. A. ^[1]; Barrios, M. ^[1]; Caggiano, J. A. ^[1]; Casey, D. T. ^[1]; Cerjan, C. J. ^[1]; Clark, D. S. ^[1]; Edwards, M. J. ^[1]; Frenje, J. A. ^[2]; Gatu-Johnson, M. ^[2]; Glebov, V. Y. ^[3]; Grim, G. ^[4]; Haan, S. W. ^[1]; Hammel, B. A. ^[1]; Hamza, A. ^[1]; Hoover, D. E. ^[5]; Hsing, W. W. ^[1]; Hurricane, O. ^[1]; Kilkenny, J. D. ^[5]; Kline, J. L. ^[4]; Knauer, J. P. ^[3] more »

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)
University of Rochester, NY (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
General Atomics, San Diego, CA (United States)
AWE Aldermaston 6 , Berkshire (United Kingdom)

Hydrodynamic instability growth and its effects on implosion performance were studied at the National Ignition Facility. Implosion performance and mix have been measured at peak compression using plastic shells filled with tritium gas and containing embedded localized carbon-deuterium diagnostic layers in various locations in the ablator. Neutron yield and ion temperature of the deuterium-tritium fusion reactions were used as a measure of shell-gas mix, while neutron yield of the tritium-tritium fusion reaction was used as a measure of implosion performance. The results have indicated that the low-mode hydrodynamic instabilities due to surface roughness were the primary culprits for yield degradation, with atomic ablator-gas mix playing a secondary role. Additionally, spherical shells with pre-imposed 2D modulations were used to measure instability growth in the acceleration phase of the implosions. The capsules were imploded using ignition-relevant laser pulses, and ablation-front modulation growth was measured using x-ray radiography for a shell convergence ratio of ~2. The measured growth was in good agreement with that predicted, thus validating simulations for the fastest growing modulations with mode numbers up to 90 in the acceleration phase. Future experiments will be focused on measurements at higher convergence, higher-mode number modulations, and growth occurring during the deceleration phase.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

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

OSTI ID:: 1229809

Alternate ID(s):: OSTI ID: 22253092

Report Number(s):: LLNL--JRNL-647156

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 21; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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