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Measuring implosion dynamics through rhoR evolution in inertial-confinement fusion experiments.

R D Petrasso1, J A Frenje, C K Li

  • 1Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Physical Review Letters
|April 12, 2003
PubMed
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Measurements of deuterium-helium-3 (D3He) implosions show significant increases in areal density (rhoR) from shock coalescence to compressive burn. Experiments confirm the absence of fuel-shell mix in central regions and intact shells during burn.

Area of Science:

  • Nuclear Fusion Science
  • Inertial Confinement Fusion (ICF)
  • Plasma Physics

Background:

  • Accurate measurement of areal density (rhoR) is crucial for understanding inertial confinement fusion (ICF) implosions.
  • Previous studies have focused on various aspects of ICF, but detailed temporal evolution of rhoR during specific phases like shock coalescence and compressive burn requires further investigation.

Purpose of the Study:

  • To measure the areal density (rhoR) of D3He filled plastic capsules at two distinct time points during ICF implosions at OMEGA.
  • To investigate the presence of fuel-shell mix and shell integrity during the implosion process.
  • To explore the origins of rhoR asymmetries observed during compressive burn.

Main Methods:

  • Utilized the OMEGA laser facility for imploding D3He filled plastic capsules.

Related Experiment Videos

  • Measured areal density (rhoR) by analyzing the energy downshift of 14.7-MeV D3He protons.
  • Collected data at two key stages: shock coalescence (1.7 ns) and compressive burn (400 ps later).

    • Main Results:

    • The azimuthally averaged rhoR increased significantly from 13+/-2.5 mg/cm(2) at shock coalescence to 70+/-8 mg/cm(2) during compressive burn.
    • Experimental results indicate no fuel-shell mix in the central regions at shock coalescence.
    • The plastic shell remained intact without holes during the compressive burn phase.

    Conclusions:

    • The study successfully quantified the temporal evolution of rhoR in D3He ICF implosions.
    • The findings support the absence of central fuel-shell mix and confirm shell integrity during burn.
    • A hypothesis is proposed that asymmetries in rhoR during compressive burn may originate from conditions present at shock coalescence.