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High-density carbon capsule experiments on the national ignition facility.

J S Ross¹, D Ho¹, J Milovich¹

¹Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|March 14, 2015

Summary

High-density carbon (HDC) capsules were tested as an ablator material for inertial confinement fusion on the National Ignition Facility (NIF). Experiments demonstrated excellent nuclear performance, achieving 70% of one-dimensional simulation predictions for neutron yield.

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Area of Science:

Nuclear Fusion Science
Materials Science for Fusion Energy
Plasma Physics

Background:

Inertial confinement fusion (ICF) requires robust ablator materials for capsule implosions.
High-density carbon (HDC) is a candidate material with potentially advantageous properties.

Purpose of the Study:

To evaluate the performance of high-density carbon (HDC) as an ablator material in indirect-drive ICF implosions.
To assess the laser-target coupling and nuclear performance of HDC capsules on the National Ignition Facility (NIF).

Main Methods:

Conducted a series of five indirect-drive implosion experiments using 76-μm-thick HDC capsules.
Utilized a four-shock laser pulse optimized for HDC, delivering 1.3 MJ of energy and 360 TW peak power.
Filled capsules with deuterium and tritium for nuclear yield measurements.

Main Results:

Demonstrated efficient laser to target coupling, achieving approximately 90% efficiency.
Achieved a maximum neutron yield of 1.6×10^15 ± 3×10^13.
Observed a yield over one-dimensional simulations of 70%, indicating excellent nuclear performance.

Conclusions:

High-density carbon (HDC) shows promise as an effective ablator material for inertial confinement fusion.
The experimental results validate HDC's suitability for achieving high performance in NIF implosions.
Further research into HDC properties can advance ICF target designs.