Stabilization of high-compression, indirect-drive inertial confinement fusion implosions using a 4-shock adiabat-shaped drive
Hydrodynamic instabilities and poor fuel compression are major factors for capsule performance degradation in ignition experiments on the National Ignition Facility. Using a recently developed laser drive profile with a decaying first shock to tune the ablative Richtmyer-Meshkov (ARM) instability and subsequent in-flight Rayleigh-Taylor growth, we have demonstrated reduced growth compared to the standard ignition pulse whilst maintaining conditions for a low fuel adiabat needed for increased compression. Here, using in-flight x-ray radiography of pre-machined modulations, the first growth measurements using this new ARM-tuned drive have demonstrated instability growth reduction of ~4× compared to the original design at a convergence ratio of ~2. Corresponding simulations give a fuel adiabat of ~1.6, similar to the original goal and consistent with ignition requirements.
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- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Report Number(s):
- LLNL-JRNL-669426
Journal ID: ISSN 1070-664X
- Grant/Contract Number:
- AC52-07NA27344
- Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 22; Journal Issue: 8; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Research Org:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org:
- USDOE
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION; 42 ENGINEERING
- OSTI Identifier:
- 1234625
- Alternate Identifier(s):
- OSTI ID: 1229620
MacPhee, A. G., Peterson, J. L., Casey, D. T., Clark, D. S., Haan, S. W., Jones, O. S., Landen, O. L., Milovich, J. L., Robey, H. F., and Smalyuk, V. A.. Stabilization of high-compression, indirect-drive inertial confinement fusion implosions using a 4-shock adiabat-shaped drive. United States: N. p.,
Web. doi:10.1063/1.4928909.
MacPhee, A. G., Peterson, J. L., Casey, D. T., Clark, D. S., Haan, S. W., Jones, O. S., Landen, O. L., Milovich, J. L., Robey, H. F., & Smalyuk, V. A.. Stabilization of high-compression, indirect-drive inertial confinement fusion implosions using a 4-shock adiabat-shaped drive. United States. doi:10.1063/1.4928909.
MacPhee, A. G., Peterson, J. L., Casey, D. T., Clark, D. S., Haan, S. W., Jones, O. S., Landen, O. L., Milovich, J. L., Robey, H. F., and Smalyuk, V. A.. 2015.
"Stabilization of high-compression, indirect-drive inertial confinement fusion implosions using a 4-shock adiabat-shaped drive". United States.
doi:10.1063/1.4928909. https://www.osti.gov/servlets/purl/1234625.
@article{osti_1234625,
title = {Stabilization of high-compression, indirect-drive inertial confinement fusion implosions using a 4-shock adiabat-shaped drive},
author = {MacPhee, A. G. and Peterson, J. L. and Casey, D. T. and Clark, D. S. and Haan, S. W. and Jones, O. S. and Landen, O. L. and Milovich, J. L. and Robey, H. F. and Smalyuk, V. A.},
abstractNote = {Hydrodynamic instabilities and poor fuel compression are major factors for capsule performance degradation in ignition experiments on the National Ignition Facility. Using a recently developed laser drive profile with a decaying first shock to tune the ablative Richtmyer-Meshkov (ARM) instability and subsequent in-flight Rayleigh-Taylor growth, we have demonstrated reduced growth compared to the standard ignition pulse whilst maintaining conditions for a low fuel adiabat needed for increased compression. Here, using in-flight x-ray radiography of pre-machined modulations, the first growth measurements using this new ARM-tuned drive have demonstrated instability growth reduction of ~4× compared to the original design at a convergence ratio of ~2. Corresponding simulations give a fuel adiabat of ~1.6, similar to the original goal and consistent with ignition requirements.},
doi = {10.1063/1.4928909},
journal = {Physics of Plasmas},
number = 8,
volume = 22,
place = {United States},
year = {2015},
month = {8}
}
- Free Publicly Accessible Full Text
- Accepted Manuscript (Publisher)
-
Accepted Manuscript (DOE)
- Publisher's Version of Record
- https://doi.org/10.1063/1.4928909