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Exploration of the Transition from the Hydrodynamic-like to the Strongly Kinetic Regime in Shock-Driven Implosions

Journal Article · · Physical Review Letters
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  1. MIT (Massachusetts Inst. of Technology), Cambridge, MA (United States). Plasma Science and Fusion Center; High Energy Density Physics Division, Plasma Science and Fusion Center, Massachusetts Institute of Technology
  2. MIT (Massachusetts Inst. of Technology), Cambridge, MA (United States). Plasma Science and Fusion Center
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  5. Univ. of Roma, Roma (Italy). Dipartimento SBAI
  6. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
  7. Univ. of Rochester, NY (United States). Lab. for Laser EnergeticsUniv. of Rochester, NY (United States). Lab. for Laser Energetics
  8. General Atomics, San Diego, CA (United States)

Clear evidence of the transition from hydrodynamiclike to strongly kinetic shock-driven implosions is, for the first time, revealed and quantitatively assessed. Implosions with a range of initial equimolar D3He gas densities show that as the density is decreased, hydrodynamic simulations strongly diverge from and increasingly over-predict the observed nuclear yields, from a factor of ~2 at 3.1 mg/cm3 to a factor of 100 at 0.14 mg/cm3. (The corresponding Knudsen number, the ratio of ion mean-free path to minimum shell radius, varied from 0.3 to 9; similarly, the ratio of fusion burn duration to ion diffusion time, another figure of merit of kinetic effects, varied from 0.3 to 14.) This result is shown to be unrelated to the effects of hydrodynamic mix. As a first step to garner insight into this transition, a reduced ion kinetic (RIK) model that includes gradient-diffusion and loss-term approximations to several transport processes was implemented within the framework of a one-dimensional radiation-transport code. After empirical calibration, the RIK simulations reproduce the observed yield trends, largely as a result of ion diffusion and the depletion of the reacting tail ions.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0001857; FC52-08NA28752; NA0002035
OSTI ID:
1172483
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 18 Vol. 112; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (32)

Species separation and kinetic effects in collisional plasma shocks journal May 2014
Kinetic mix mechanisms in shock-driven inertial confinement fusion implosions journal May 2014
The effect of shock dynamics on compressibility of ignition-scale National Ignition Facility implosions journal November 2014
Investigation of ion kinetic effects in direct-drive exploding-pusher implosions at the NIF journal December 2014
Assessment of ion kinetic effects in shock-driven inertial confinement fusion implosions using fusion burn imaging journal June 2015
Using multiple secondary fusion products to evaluate fuel ρR, electron temperature, and mix in deuterium-filled implosions at the NIF journal August 2015
Ion-kinetic simulations of D- 3 He gas-filled inertial confinement fusion target implosions with moderate to large Knudsen number journal January 2016
Shock-induced mix across an ideal interface journal April 2017
Imaging at an x-ray absorption edge using free electron laser pulses for interface dynamics in high energy density systems journal May 2017
Ion species stratification within strong shocks in two-ion plasmas journal March 2018
Yield degradation in inertial-confinement-fusion implosions due to shock-driven kinetic fuel-species stratification and viscous heating journal May 2018
Diffusion-driven fluid dynamics in ideal gases and plasmas journal June 2018
The single-line-of-sight, time-resolved x-ray imager diagnostic on OMEGA journal October 2018
Kinetic effects on neutron generation in moderately collisional interpenetrating plasma flows journal January 2019
Multi-species plasma transport in 1D direct-drive ICF simulations journal March 2019
Fuel-ion diffusion in shock-driven inertial confinement fusion implosions journal September 2019
Probing ion species separation and ion thermal decoupling in shock-driven implosions using multiple nuclear reaction histories journal July 2019
Hybrid particle-in-cell simulations of laser-driven plasma interpenetration, heating, and entrainment journal November 2019
Self-similar solutions for multi-species plasma mixing by gradient driven transport journal March 2018
Kinetic physics in ICF: present understanding and future directions journal April 2018
Spectral composition of thermonuclear particle and recoil nuclear emissions from laser fusion targets intended for modern ignition experiments journal June 2018
Yield reduction via the Knudsen layer effect in a mixture of fuel and pusher material journal December 2018
Compression and burning of a direct-driven thermonuclear target under the conditions of inhomogeneous heating by a multi-beam megajoule laser journal January 2019
Nuclear diagnostics for Inertial Confinement Fusion (ICF) plasmas journal January 2020
Deciphering the kinetic structure of multi-ion plasma shocks journal November 2017
Diffusion-dominated mixing in moderate convergence implosions journal June 2018
Nuclear yield reduction in inertial confinement fusion exploding-pusher targets explained by fuel-pusher mixing through hybrid kinetic-fluid modeling journal September 2018
Ion Thermal Decoupling and Species Separation in Shock-Driven Implosions journal January 2015
Self-Similar Structure and Experimental Signatures of Suprathermal Ion Distribution in Inertial Confinement Fusion Implosions journal September 2015
Observations of Multiple Nuclear Reaction Histories and Fuel-Ion Species Dynamics in Shock-Driven Inertial Confinement Fusion Implosions journal January 2019
Deciphering the Kinetic Structure of Multi-Ion Plasma Shocks text January 2017
Ion Species Stratification Within Strong Shocks in Two-Ion Plasmas text January 2017

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