Mechanisms of shape transfer and preheating in indirect-drive double shell collisions
Abstract
Implosions of Hohlraum-driven double shell targets as an alternative inertial confinement fusion concept are underway at the National Ignition Facility. The double shell system relies on a series of energy transfer processes starting from thermal x-ray absorption by the outer shell, followed by collisional transfer of kinetic energy to a heavy metal inner shell, and finally, conversion to the internal energy of the deuterium-tritium fuel. During each of these energy transfer stages, low-mode asymmetries can act to reduce the ideal transfer efficiency degrading double shell performance. Mechanisms, such as hard x-ray preheat from the Hohlraum, not only decrease the efficiency of kinetic energy transfer but may also be a source of low-mode asymmetry. In this article, we evaluate the shape transfer processes through the time of shell collision using two-dimensional integrated Hohlraum and capsule computations. We find that the dominant mode of the shape transfer is well described using a “radial impulse” model from the shape of the foam pressure reservoir. To evaluate the importance of preheat on inner shell shape, we also report on first measurements of Au L-shell preheat asymmetry in a double shell with a tungsten pusher. These measurements showed a 65% higher preheat velocity at themore »
- Authors:
-
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- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- General Atomics, San Diego, CA (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1883020
- Alternate Identifier(s):
- OSTI ID: 1870931; OSTI ID: 1872357
- Report Number(s):
- LLNL-JRNL-829726; LA-UR-21-32041
Journal ID: ISSN 1070-664X; 1045521; TRN: US2307960
- Grant/Contract Number:
- AC52-07NA27344; 89233218CNA000001; 89233218CNA000063
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 29; Journal Issue: 6; 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; plasma confinement; shock waves; high-energy x-rays; hard x-rays; lasers; nuclear fuel; thermal radiation
Citation Formats
Loomis, Eric Nicholas, Robey, III, Harry F., Haines, Brian Michael, Morrow, Tana, Montgomery, David S., Wilson, Douglas Carl, Xu, Hongwei, Millot, Marius, Celliers, Peter, Sacks, Ryan Foster, Sauppe, Joshua Paul, Quintana, Theresa E., Heinbockel, Chuck, Kroll, Jeremy, Randolph, Blaine Randall, Fierro, Franklin, Wilson, Christopher Talker, Daughton, William Scott, Merritt, Elizabeth Catherine, Finnegan, Sean Michael, Kot, Lynn, Keiter, Paul Arthur, Sagert, Irina, Stark, David James, Amendt, Peter, Ping, Yuan, Smalyuk, Vladimir A., Patel, Mehul V., and Salmonson, Jay D. Mechanisms of shape transfer and preheating in indirect-drive double shell collisions. United States: N. p., 2022.
Web. doi:10.1063/5.0081346.
Loomis, Eric Nicholas, Robey, III, Harry F., Haines, Brian Michael, Morrow, Tana, Montgomery, David S., Wilson, Douglas Carl, Xu, Hongwei, Millot, Marius, Celliers, Peter, Sacks, Ryan Foster, Sauppe, Joshua Paul, Quintana, Theresa E., Heinbockel, Chuck, Kroll, Jeremy, Randolph, Blaine Randall, Fierro, Franklin, Wilson, Christopher Talker, Daughton, William Scott, Merritt, Elizabeth Catherine, Finnegan, Sean Michael, Kot, Lynn, Keiter, Paul Arthur, Sagert, Irina, Stark, David James, Amendt, Peter, Ping, Yuan, Smalyuk, Vladimir A., Patel, Mehul V., & Salmonson, Jay D. Mechanisms of shape transfer and preheating in indirect-drive double shell collisions. United States. https://doi.org/10.1063/5.0081346
Loomis, Eric Nicholas, Robey, III, Harry F., Haines, Brian Michael, Morrow, Tana, Montgomery, David S., Wilson, Douglas Carl, Xu, Hongwei, Millot, Marius, Celliers, Peter, Sacks, Ryan Foster, Sauppe, Joshua Paul, Quintana, Theresa E., Heinbockel, Chuck, Kroll, Jeremy, Randolph, Blaine Randall, Fierro, Franklin, Wilson, Christopher Talker, Daughton, William Scott, Merritt, Elizabeth Catherine, Finnegan, Sean Michael, Kot, Lynn, Keiter, Paul Arthur, Sagert, Irina, Stark, David James, Amendt, Peter, Ping, Yuan, Smalyuk, Vladimir A., Patel, Mehul V., and Salmonson, Jay D. Wed .
"Mechanisms of shape transfer and preheating in indirect-drive double shell collisions". United States. https://doi.org/10.1063/5.0081346. https://www.osti.gov/servlets/purl/1883020.
@article{osti_1883020,
title = {Mechanisms of shape transfer and preheating in indirect-drive double shell collisions},
author = {Loomis, Eric Nicholas and Robey, III, Harry F. and Haines, Brian Michael and Morrow, Tana and Montgomery, David S. and Wilson, Douglas Carl and Xu, Hongwei and Millot, Marius and Celliers, Peter and Sacks, Ryan Foster and Sauppe, Joshua Paul and Quintana, Theresa E. and Heinbockel, Chuck and Kroll, Jeremy and Randolph, Blaine Randall and Fierro, Franklin and Wilson, Christopher Talker and Daughton, William Scott and Merritt, Elizabeth Catherine and Finnegan, Sean Michael and Kot, Lynn and Keiter, Paul Arthur and Sagert, Irina and Stark, David James and Amendt, Peter and Ping, Yuan and Smalyuk, Vladimir A. and Patel, Mehul V. and Salmonson, Jay D.},
abstractNote = {Implosions of Hohlraum-driven double shell targets as an alternative inertial confinement fusion concept are underway at the National Ignition Facility. The double shell system relies on a series of energy transfer processes starting from thermal x-ray absorption by the outer shell, followed by collisional transfer of kinetic energy to a heavy metal inner shell, and finally, conversion to the internal energy of the deuterium-tritium fuel. During each of these energy transfer stages, low-mode asymmetries can act to reduce the ideal transfer efficiency degrading double shell performance. Mechanisms, such as hard x-ray preheat from the Hohlraum, not only decrease the efficiency of kinetic energy transfer but may also be a source of low-mode asymmetry. In this article, we evaluate the shape transfer processes through the time of shell collision using two-dimensional integrated Hohlraum and capsule computations. We find that the dominant mode of the shape transfer is well described using a “radial impulse” model from the shape of the foam pressure reservoir. To evaluate the importance of preheat on inner shell shape, we also report on first measurements of Au L-shell preheat asymmetry in a double shell with a tungsten pusher. These measurements showed a 65% higher preheat velocity at the pole of the capsule relative to the equator. We also found that the experiments provided rigorous constraints by which to test the Hohlraum model settings that impact the amount and symmetry of Au L-shell preheat via the plasma conditions inside the outer cone Au bubble.},
doi = {10.1063/5.0081346},
journal = {Physics of Plasmas},
number = 6,
volume = 29,
place = {United States},
year = {Wed Jun 01 00:00:00 EDT 2022},
month = {Wed Jun 01 00:00:00 EDT 2022}
}
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