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Implementing time resolved electron temperature capability at the NIF using a streak camera
S F Khan1, L C Jarrott1, P K Patel1
1Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
The Review of Scientific Instruments
|November 8, 2018
Summary
A new National Ignition Facility (NIF) capability measures hot spot electron temperatures in Inertial Confinement Fusion (ICF) implosions. This temporally resolved measurement provides crucial data for understanding fusion performance dynamics.
Area of Science:
- Nuclear Fusion and Plasma Physics
- X-ray Spectroscopy
- Diagnostic Instrumentation
Background:
- Electron temperature (Te) of ICF hot spots indicates implosion performance.
- Current Te measurements are spatially and temporally integrated.
- Temporally resolved Te is needed to study hot spot heating and cooling mechanisms.
Purpose of the Study:
- To implement a new capability at NIF for temporally resolved Te measurements.
- To improve understanding of hot spot physics in ICF implosions.
- To develop a diagnostic sensitive to Te above 3 keV, minimizing shell/fuel attenuation effects.
Main Methods:
- Modification of an existing x-ray streak camera with specific filters (titanium, zinc).
- Utilizing a dual-slit aperture to enhance signal detection for high-energy emissions.
- Developing a solving technique to infer Te from filtered spectral data.
Main Results:
- Successful implementation of a diagnostic for temporally resolved Te measurements.
- Demonstration of filter effectiveness in isolating specific energy regions.
- Initial Te results from ICF implosions reported.
Conclusions:
- The new diagnostic provides valuable temporally resolved Te data for ICF research.
- The filter and slit design effectively addresses challenges of opacity and low signal levels.
- This capability will enhance the study of hot spot dynamics and fusion performance.
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