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Thermal Temperature Measurements of Inertial Fusion Implosions.
L C Jarrott1, B Bachmann1, T Ma1
1Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
Physical Review Letters
|September 8, 2018
Summary
Accurate thermal temperature measurements in fusion plasmas are crucial for understanding ignition performance. This study uses a novel spectrometer to measure electron temperature, aiding in energy partition analysis in hot spots.
Area of Science:
- Plasma Physics
- Fusion Energy
- Astrophysical Plasmas
Background:
- Accurate thermal temperature measurement is vital for characterizing inertial confinement fusion (ICF) performance.
- Understanding stagnation conditions requires validated physics models.
- Electron temperature is a key parameter in fusion plasma diagnostics.
Purpose of the Study:
- To present experimental results for thermal electron temperature measurement in cryogenic deuterium-tritium implosions.
- To validate physics understanding of stagnation conditions in ICF.
- To infer energy partition in the hot spot using electron temperature and neutron spectra.
Main Methods:
- Utilized a differential filter spectrometer for X-ray continuum emission analysis.
- Conducted cryogenic deuterium-tritium implosions at the National Ignition Facility.
- Employed Doppler-broadened DT neutron spectra in conjunction with electron temperature measurements.
Main Results:
- Successfully measured thermal electron temperature from X-ray continuum emission.
- Demonstrated the capability to infer energy partition between internal and kinetic energy.
- Provided experimental data for validating ICF physics models.
Conclusions:
- The differential filter spectrometer is effective for measuring thermal electron temperature in ICF plasmas.
- Electron temperature measurements are essential for a comprehensive understanding of energy dynamics in the hot spot.
- This work contributes to the characterization of ignition performance and the validation of fusion physics.
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