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Source geometric considerations for OMEGA Dante measurements.
M J May1, J R Patterson, C Sorce
1Lawrence Livermore National Laboratory, Livermore, California 94551, USA. may13@llnl.gov
The Review of Scientific Instruments
|November 7, 2012
Summary
The Dante diagnostic system measures X-ray flux from laser-produced plasmas. Challenges arise from non-uniform emission and energy-dependent source sizes, impacting yield accuracy.
Area of Science:
- Plasma Physics
- High-Energy-Density Physics
- X-ray Diagnostics
Background:
- The Dante diagnostic is a 15-channel filtered diode array at the OMEGA laser facility.
- It measures spectrally and temporally resolved X-ray radiation flux (50 eV to 10 keV).
- Applications include Hohlraum and gas pipe targets.
Purpose of the Study:
- To analyze the accuracy of X-ray yield determination using the Dante system.
- To investigate challenges posed by non-uniform X-ray emission and energy-dependent source sizes.
- To discuss the impact of these factors on target yield calculations.
Main Methods:
- Radiometric calibration of X-ray diodes, filters, and mirrors.
- Application of an unfold algorithm to recorded channel voltages.
- Analysis of spectral and temporal X-ray flux data.
Main Results:
- The unfold algorithm assumes a spatially uniform and constant-area X-ray source.
- Observed 'hot spots' from laser-target interaction cause non-uniform emission.
- Thin-walled low-Z targets exhibit energy-dependent source sizes, affecting low-energy opacity and high-energy transmissivity.
Conclusions:
- The assumption of a uniform source size is problematic for accurate yield determination.
- Non-uniform emission and energy-dependent source sizes complicate X-ray yield calculations.
- Further analysis is needed to address these challenges for improved accuracy.
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