Self-Generated Magnetic Fields in the Stagnation Phase of Indirect-Drive Implosions on the National Ignition Facility
- 10 April 2017
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 118 (15), 155001
- https://doi.org/10.1103/physrevlett.118.155001
Abstract
Three-dimensional extended-magnetohydrodynamic simulations of the stagnation phase of inertial confinement fusion implosion experiments at the National Ignition Facility are presented, showing self-generated magnetic fields over . Angular high mode-number perturbations develop large magnetic fields, but are localized to the cold, dense hot-spot surface, which is hard to magnetize. When low-mode perturbations are also present, the magnetic fields are injected into the hot core, reaching significant magnetizations, with peak local thermal conductivity reductions greater than 90%. However, Righi-Leduc heat transport effectively cools the hot spot and lowers the neutron spectra-inferred ion temperatures compared to the unmagnetized case. The Nernst effect qualitatively changes the results by demagnetizing the hot-spot core, while increasing magnetizations at the edge and near regions of large heat loss.
Keywords
Funding Information
- Engineering and Physical Sciences Research Council (EP/K028464/1, EP/L000237/1)
- Atomic Weapons Establishment
This publication has 24 references indexed in Scilit:
- Three-dimensional simulations of low foot and high foot implosion experiments on the National Ignition FacilityPhysics of Plasmas, 2016
- Understanding Fuel Magnetization and Mix Using Secondary Nuclear Reactions in Magneto-Inertial FusionPhysical Review Letters, 2014
- Self-generated magnetic fields in direct-drive implosion experimentsPhysics of Plasmas, 2014
- The Braginskii model of the Rayleigh–Taylor instability. I. Effects of self-generated magnetic fields and thermal conduction in two dimensionsHigh Energy Density Physics, 2013
- Mechanism for magnetic field generation and growth in Rayleigh-Taylor unstable inertial confinement fusion plasmasPhysics of Plasmas, 2012
- First Measurements of Rayleigh-Taylor-Induced Magnetic Fields in Laser-Produced PlasmasPhysical Review Letters, 2012
- High-Gain Magnetized Inertial FusionPhysical Review Letters, 2012
- Fusion Yield Enhancement in Magnetized Laser-Driven ImplosionsPhysical Review Letters, 2011
- Dynamics of Self-Generated Magnetic Fields in Stagnation Phase and their Effects on Hot Spark FormationPlasma and Fusion Research, 2006
- Parameter space for magnetized fuel targets in inertial confinement fusionNuclear Fusion, 1983