Control of low-mode drive asymmetry in an efficient long-pulse low gas-fill density Hohlraum
Abstract
Laser-driven Hohlraums filled with gas at lower densities (<0.6 mg/cc) have higher efficiency compared to original ≥ 0.96 mg/cc fill because of reduced backscatter losses [Hall et al., Phys. Plasmas 24, 052706 (2017)]. However, using low-density filled Hohlraums with longer drive required for lower adiabat implosions, and hence potentially higher inertial confinement fusion gain designs, has been challenging since the Hohlraum wall blow-off is less tamped, thus altering the laser beam absorption regions and drive symmetry. A series of NIF experiments using optimized pulse shaping, beam pointing, and temporal phasing have demonstrated, through imaging of the Hohlraum and capsule dynamics, that a symmetric implosion using a 14-ns low-adiabat drive pulse {2× longer than high-density-carbon ablator designs using low gas-fill density Hohlraums [Divol et al., Phys. Plasmas 24, 056309 (2017)]} is possible in a low backscatter loss 0.45 mg/cc He-filled Hohlraum. The ingress of the Hohlraum walls was mitigated by revisiting the adiabat-shaped design [Clark et al., Phys. Plasmas 21, 112705 (2014)] that uses a low-power (1 TW) trough that delays the wall expansion. Low-mode P2 and P4 drive asymmetry swings caused by the drift of the laser spots were essentially zeroed out by employing temporal beam phasing between cones ofmore »
- Authors:
-
more »
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- General Atomics, La Jolla, California 92121 (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); General Atomics, La Jolla, California 92121 (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)
- OSTI Identifier:
- 1971298
- Alternate Identifier(s):
- OSTI ID: 1963733
- Report Number(s):
- LLNL-JRNL-842205
Journal ID: ISSN 1070-664X; 1064151; TRN: US2313555
- Grant/Contract Number:
- AC52-07NA27344; 89233119CNA000063
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 30; Journal Issue: 3; Conference: 64. Annual Meeting of the APS Division of Plasma Physics, Spokane, WA (United States), 17-21 Oct 2022; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; hard x-rays; laser fusion; plasma instabilities; radiography
Citation Formats
Izumi, N., Döppner, T., Milovich, J. L., Landen, O. L., Callahan, D. A., Chapman, T., Hinkel, D. E., Hatala, C. Houldin, Khan, S., Kroll, J. J., MacGowan, B. J., Marin, E., Mariscal, D., Mauldin, M., Millot, M., Moody, J. D., Newman, K., Ratledge, M., Ross, J. S., Tubman, E., Vonhof, S., and Wall, J. Control of low-mode drive asymmetry in an efficient long-pulse low gas-fill density Hohlraum. United States: N. p., 2023.
Web. doi:10.1063/5.0136145.
Izumi, N., Döppner, T., Milovich, J. L., Landen, O. L., Callahan, D. A., Chapman, T., Hinkel, D. E., Hatala, C. Houldin, Khan, S., Kroll, J. J., MacGowan, B. J., Marin, E., Mariscal, D., Mauldin, M., Millot, M., Moody, J. D., Newman, K., Ratledge, M., Ross, J. S., Tubman, E., Vonhof, S., & Wall, J. Control of low-mode drive asymmetry in an efficient long-pulse low gas-fill density Hohlraum. United States. https://doi.org/10.1063/5.0136145
Izumi, N., Döppner, T., Milovich, J. L., Landen, O. L., Callahan, D. A., Chapman, T., Hinkel, D. E., Hatala, C. Houldin, Khan, S., Kroll, J. J., MacGowan, B. J., Marin, E., Mariscal, D., Mauldin, M., Millot, M., Moody, J. D., Newman, K., Ratledge, M., Ross, J. S., Tubman, E., Vonhof, S., and Wall, J. Tue .
"Control of low-mode drive asymmetry in an efficient long-pulse low gas-fill density Hohlraum". United States. https://doi.org/10.1063/5.0136145. https://www.osti.gov/servlets/purl/1971298.
@article{osti_1971298,
title = {Control of low-mode drive asymmetry in an efficient long-pulse low gas-fill density Hohlraum},
author = {Izumi, N. and Döppner, T. and Milovich, J. L. and Landen, O. L. and Callahan, D. A. and Chapman, T. and Hinkel, D. E. and Hatala, C. Houldin and Khan, S. and Kroll, J. J. and MacGowan, B. J. and Marin, E. and Mariscal, D. and Mauldin, M. and Millot, M. and Moody, J. D. and Newman, K. and Ratledge, M. and Ross, J. S. and Tubman, E. and Vonhof, S. and Wall, J.},
abstractNote = {Laser-driven Hohlraums filled with gas at lower densities (<0.6 mg/cc) have higher efficiency compared to original ≥ 0.96 mg/cc fill because of reduced backscatter losses [Hall et al., Phys. Plasmas 24, 052706 (2017)]. However, using low-density filled Hohlraums with longer drive required for lower adiabat implosions, and hence potentially higher inertial confinement fusion gain designs, has been challenging since the Hohlraum wall blow-off is less tamped, thus altering the laser beam absorption regions and drive symmetry. A series of NIF experiments using optimized pulse shaping, beam pointing, and temporal phasing have demonstrated, through imaging of the Hohlraum and capsule dynamics, that a symmetric implosion using a 14-ns low-adiabat drive pulse {2× longer than high-density-carbon ablator designs using low gas-fill density Hohlraums [Divol et al., Phys. Plasmas 24, 056309 (2017)]} is possible in a low backscatter loss 0.45 mg/cc He-filled Hohlraum. The ingress of the Hohlraum walls was mitigated by revisiting the adiabat-shaped design [Clark et al., Phys. Plasmas 21, 112705 (2014)] that uses a low-power (1 TW) trough that delays the wall expansion. Low-mode P2 and P4 drive asymmetry swings caused by the drift of the laser spots were essentially zeroed out by employing temporal beam phasing between cones of beams [Turner et al., Phys. Plasmas 7, 333 (2000)]. So the results also indicate an improved coupling efficiency of ~30% compared to an earlier design using higher density filled Hohlraums and pave the way for revisiting low-adiabat, high convergence drives using CH ablators.},
doi = {10.1063/5.0136145},
journal = {Physics of Plasmas},
number = 3,
volume = 30,
place = {United States},
year = {Tue Mar 28 00:00:00 EDT 2023},
month = {Tue Mar 28 00:00:00 EDT 2023}
}
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