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Source characterization and modeling development for monoenergetic-proton radiography experiments on OMEGA.
M J-E Manuel1, A B Zylstra, H G Rinderknecht
1Plasma Science and Fusion Center, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
The Review of Scientific Instruments
|July 5, 2012
Summary
Researchers characterized a monoenergetic proton source for proton radiography at the OMEGA laser facility. A Geant4-based model was developed and validated for simulating these experiments, showing good agreement with cold-matter targets.
Area of Science:
- Nuclear Physics
- Plasma Physics
- Laser-driven Fusion
Background:
- Proton radiography is a powerful diagnostic for studying dense plasmas created by high-energy lasers.
- Characterizing the proton source is crucial for accurate interpretation of radiography data.
- Existing modeling tools may not fully capture the complexities of fusion proton sources and their interactions with targets.
Purpose of the Study:
- To characterize a monoenergetic proton source for proton radiography at the OMEGA laser facility.
- To develop and validate a Geant4-based simulation tool for proton radiography experiments.
- To assess the accuracy of the cold-matter approximation for proton scattering in plasma.
Main Methods:
- Utilized multiple diagnostics to measure global isotropy and local uniformity of proton fluence.
- Employed Geant4 framework to construct a simulation model incorporating realistic source parameters and target geometries.
- Benchmarked simulation results against experimental radiographs of cold-matter targets.
- Analyzed the cold-matter approximation for proton scattering in a typical laser-foil experiment.
Main Results:
- Global proton fluence uniformity deviations were found to be ~16% (DD) and ~26% (D3He).
- Local nonuniformities were minimally impacted by high angular frequencies (>50 rad^-1).
- The developed Geant4 model accurately reproduced experimental radiographs of cold-matter targets.
- The cold-matter approximation for proton scattering in plasma was found to be accurate within ~10% of the analytic plasma model.
Conclusions:
- The characterized proton source and developed Geant4 model provide a reliable tool for proton radiography experiments.
- The simulation model is validated for realistic source parameters and target configurations.
- The cold-matter approximation offers a computationally efficient and reasonably accurate method for simulating proton scattering in certain plasma conditions.
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