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Developing an Experimental Basis for Understanding Transport in NIF Hohlraum Plasmas
M A Barrios1, J D Moody2, L J Suter2
1In-Q-Tel, Menlo Park, California 94025, USA.
Physical Review Letters
|September 20, 2018
Summary
Researchers mapped electron temperature and flow in an ignition hohlraum using spectroscopic tracers. Results show varied heat flow, suggesting kinetic effects influence transport in laser-driven cavities.
Area of Science:
- Plasma Physics
- Fusion Energy Research
- Astrophysical Plasma Simulations
Background:
- Ignition hohlraums are critical for inertial confinement fusion.
- Understanding plasma conditions is essential for achieving ignition.
- Previous measurements lacked spatial resolution.
Purpose of the Study:
- To perform the first multilocation electron temperature and flow measurements in an ignition hohlraum.
- To create a low-resolution map of hohlraum plasma conditions.
- To test particle and energy transport physics in laser-driven x-ray cavities.
Main Methods:
- Utilized novel mid-Z spectroscopic tracer "dots."
- Conducted measurements at multiple locations within the hohlraum.
- Employed techniques for electron temperature (T_{e}) and flow determination.
Main Results:
- Generated a "map" of hohlraum plasma conditions.
- Observed classical heat flow near the capsule.
- Found reduced heat flow near the laser entrance hole.
Conclusions:
- Data is consistent with spatially dependent heat transport.
- Kinetic effects, magnetic fields, and instabilities are evaluated as causes.
- Provides a basis for future transport physics studies in hohlraums.
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