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Title: Three-dimensional hydrodynamics of the deceleration stage in inertial confinement fusion

Abstract

The deceleration stage of inertial confinement fusion implosions is modeled in detail using three-dimensional simulations designed to match experiments at the National Ignition Facility. In this final stage of the implosion, shocks rebound from the center of the capsule, forming the high-temperature, low-density hot spot and slowing the incoming fuel. The flow field that results from this process is highly three-dimensional and influences many aspects of the implosion. The interior of the capsule has high-velocity motion, but viscous effects limit the range of scales that develop. The bulk motion of the hot spot shows qualitative agreement with experimental velocity measurements, while the variance of the hot spot velocity would broaden the DT neutron spectrum, increasing the inferred temperature by 400–800 eV. Jets of ablator material are broken apart and redirected as they enter this dynamic hot spot. Deceleration stage simulations using two fundamentally different rad-hydro codes are compared and the flow field is found to be in good agreement.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]
  1. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
Publication Date:
OSTI Identifier:
22408214
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 3; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CAPSULES; D-T OPERATION; EV RANGE; HOT SPOTS; HYDRODYNAMICS; IMPLOSIONS; INERTIAL CONFINEMENT; NEUTRON SPECTRA; TEMPERATURE RANGE 0400-1000 K; THREE-DIMENSIONAL CALCULATIONS; US NATIONAL IGNITION FACILITY; VELOCITY

Citation Formats

Weber, C. R., E-mail: weber30@llnl.gov, Clark, D. S., Cook, A. W., Eder, D. C., Haan, S. W., Hammel, B. A., Hinkel, D. E., Jones, O. S., Marinak, M. M., Milovich, J. L., Patel, P. K., Robey, H. F., Salmonson, J. D., Sepke, S. M., and Thomas, C. A. Three-dimensional hydrodynamics of the deceleration stage in inertial confinement fusion. United States: N. p., 2015. Web. doi:10.1063/1.4914157.
Weber, C. R., E-mail: weber30@llnl.gov, Clark, D. S., Cook, A. W., Eder, D. C., Haan, S. W., Hammel, B. A., Hinkel, D. E., Jones, O. S., Marinak, M. M., Milovich, J. L., Patel, P. K., Robey, H. F., Salmonson, J. D., Sepke, S. M., & Thomas, C. A. Three-dimensional hydrodynamics of the deceleration stage in inertial confinement fusion. United States. doi:10.1063/1.4914157.
Weber, C. R., E-mail: weber30@llnl.gov, Clark, D. S., Cook, A. W., Eder, D. C., Haan, S. W., Hammel, B. A., Hinkel, D. E., Jones, O. S., Marinak, M. M., Milovich, J. L., Patel, P. K., Robey, H. F., Salmonson, J. D., Sepke, S. M., and Thomas, C. A. Sun . "Three-dimensional hydrodynamics of the deceleration stage in inertial confinement fusion". United States. doi:10.1063/1.4914157.
@article{osti_22408214,
title = {Three-dimensional hydrodynamics of the deceleration stage in inertial confinement fusion},
author = {Weber, C. R., E-mail: weber30@llnl.gov and Clark, D. S. and Cook, A. W. and Eder, D. C. and Haan, S. W. and Hammel, B. A. and Hinkel, D. E. and Jones, O. S. and Marinak, M. M. and Milovich, J. L. and Patel, P. K. and Robey, H. F. and Salmonson, J. D. and Sepke, S. M. and Thomas, C. A.},
abstractNote = {The deceleration stage of inertial confinement fusion implosions is modeled in detail using three-dimensional simulations designed to match experiments at the National Ignition Facility. In this final stage of the implosion, shocks rebound from the center of the capsule, forming the high-temperature, low-density hot spot and slowing the incoming fuel. The flow field that results from this process is highly three-dimensional and influences many aspects of the implosion. The interior of the capsule has high-velocity motion, but viscous effects limit the range of scales that develop. The bulk motion of the hot spot shows qualitative agreement with experimental velocity measurements, while the variance of the hot spot velocity would broaden the DT neutron spectrum, increasing the inferred temperature by 400–800 eV. Jets of ablator material are broken apart and redirected as they enter this dynamic hot spot. Deceleration stage simulations using two fundamentally different rad-hydro codes are compared and the flow field is found to be in good agreement.},
doi = {10.1063/1.4914157},
journal = {Physics of Plasmas},
number = 3,
volume = 22,
place = {United States},
year = {Sun Mar 15 00:00:00 EDT 2015},
month = {Sun Mar 15 00:00:00 EDT 2015}
}