skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Simulation and analysis of time-gated monochromatic radiographs of cryogenic implosions on OMEGA

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »; ; ; ; ; « less
Publication Date:
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1419535
Grant/Contract Number:
NA0001944
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
High Energy Density Physics
Additional Journal Information:
Journal Volume: 23; Journal Issue: C; Related Information: CHORUS Timestamp: 2018-02-02 22:35:39; Journal ID: ISSN 1574-1818
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Epstein, R., Stoeckl, C., Goncharov, V. N., McKenty, P. W., Marshall, F. J., Regan, S. P., Betti, R., Bittle, W., Harding, D. R., Hu, S. X., Igumenshchev, I. V., Jacobs-Perkins, D., Janezic, R. T., Kelly, J. H., Kosc, T. Z., Mileham, C., Morse, S. F. B., Radha, P. B., Rice, B., Sangster, T. C., Shoup III, M. J., Shmayda, W. T., Sorce, C., Ulreich, J., and Wittman, M. D. Simulation and analysis of time-gated monochromatic radiographs of cryogenic implosions on OMEGA. Netherlands: N. p., 2017. Web. doi:10.1016/j.hedp.2017.04.005.
Epstein, R., Stoeckl, C., Goncharov, V. N., McKenty, P. W., Marshall, F. J., Regan, S. P., Betti, R., Bittle, W., Harding, D. R., Hu, S. X., Igumenshchev, I. V., Jacobs-Perkins, D., Janezic, R. T., Kelly, J. H., Kosc, T. Z., Mileham, C., Morse, S. F. B., Radha, P. B., Rice, B., Sangster, T. C., Shoup III, M. J., Shmayda, W. T., Sorce, C., Ulreich, J., & Wittman, M. D. Simulation and analysis of time-gated monochromatic radiographs of cryogenic implosions on OMEGA. Netherlands. doi:10.1016/j.hedp.2017.04.005.
Epstein, R., Stoeckl, C., Goncharov, V. N., McKenty, P. W., Marshall, F. J., Regan, S. P., Betti, R., Bittle, W., Harding, D. R., Hu, S. X., Igumenshchev, I. V., Jacobs-Perkins, D., Janezic, R. T., Kelly, J. H., Kosc, T. Z., Mileham, C., Morse, S. F. B., Radha, P. B., Rice, B., Sangster, T. C., Shoup III, M. J., Shmayda, W. T., Sorce, C., Ulreich, J., and Wittman, M. D. 2017. "Simulation and analysis of time-gated monochromatic radiographs of cryogenic implosions on OMEGA". Netherlands. doi:10.1016/j.hedp.2017.04.005.
@article{osti_1419535,
title = {Simulation and analysis of time-gated monochromatic radiographs of cryogenic implosions on OMEGA},
author = {Epstein, R. and Stoeckl, C. and Goncharov, V. N. and McKenty, P. W. and Marshall, F. J. and Regan, S. P. and Betti, R. and Bittle, W. and Harding, D. R. and Hu, S. X. and Igumenshchev, I. V. and Jacobs-Perkins, D. and Janezic, R. T. and Kelly, J. H. and Kosc, T. Z. and Mileham, C. and Morse, S. F. B. and Radha, P. B. and Rice, B. and Sangster, T. C. and Shoup III, M. J. and Shmayda, W. T. and Sorce, C. and Ulreich, J. and Wittman, M. D.},
abstractNote = {},
doi = {10.1016/j.hedp.2017.04.005},
journal = {High Energy Density Physics},
number = C,
volume = 23,
place = {Netherlands},
year = 2017,
month = 6
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on April 25, 2018
Publisher's Accepted Manuscript

Save / Share:
  • Cited by 1
  • We discuss the observation and data analysis of argon K-shell line spectra from argon-doped deuterium-filled OMEGA direct-drive implosion cores based on data recorded with two streaked crystal spectrometers. The targets were 870 {mu}m in diameter, 27 {mu}m wall thickness plastic shells filled with 20 atm of deuterium gas, and a tracer amount of argon for diagnostic purposes. The argon K-shell line spectrum is primarily emitted at the collapse of the implosion and its analysis provides a spectroscopic diagnostic of the core implosion conditions. The observed spectra includes the He{alpha}, Ly{alpha}, He{beta}, He{gamma}, Ly{beta}, and Ly{gamma} line emissions and their associatedmore » He- and Li-like satellites thus covering a broad photon energy range from 3100 to 4200 eV with a spectral resolution power of approximately 500. The data analysis relies on detailed atomic and spectral models that take into account nonequilibrium collisional-radiative atomic kinetics, Stark-broadened line shapes, and radiation transport calculations.« less
  • Ignition of imploding inertial confinement capsules requires, among other things, controlling the symmetry with high accuracy and fidelity. We have used gated x-ray imaging, with 10 {mu}m and 70 ps resolution, to detect the x-ray emission from the imploded core of symmetry capsules at the National Ignition Facility. The measurements are used to characterize the time dependent symmetry and the x-ray bang time of the implosion from two orthogonal directions. These measurements were one of the primary diagnostics used to tune the parameters of the laser and Hohlraum to vary the symmetry and x-ray bang time of the implosion ofmore » cryogenically cooled ignition scale deuterium/helium filled plastic capsules. Here, we will report on the successful measurements performed with up to 1.2 MJ of laser energy in a fully integrated cryogenics gas-filled ignition-scale Hohlraum and capsule illuminated with 192 smoothed laser beams. We will describe the technique, the accuracy of the technique, and the results of the variation in symmetry with tuning parameters, and explain how that set was used to predictably tune the implosion symmetry as the laser energy, the laser cone wavelength separation, and the Hohlraum size were increased to ignition scales. We will also describe how to apply that technique to cryogenically layered tritium-hydrogen-deuterium capsules.« less
  • Direct-drive spherical implosions of cryogenic, D2-filled capsules are performed on the 60-beam OMEGA laser system. The targets are energy scaled from the base line ignition design developed for the National Ignition Facility.
  • The compression in direct-drive, low-adiabat spherical implosions was studied using cryogenic D2 targets on the 60-beam, 351-nm OMEGA laser in the range of laser intensities from ~3 x 10^14 to ~1.5 x 10^15 W/cm^2. The neutron-burn‚Äďaveraged areal densities decreased as the laser intensity increased. This decrease in areal density is highly correlated with the increased hard-x-ray signals, caused by hot electrons generated by the two-plasmon-decay instability. The areal-density reduction up to ~2, observed in the experiments, requires a preheat energy of ~60 J (~0.3% of total laser energy), which is consistent with the estimated preheat levels inferred from the hard-x-raymore » signal levels. Mitigating the generation of fast-electrons results in high areal densities which are close to the 1D predictions.« less