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Raster Thomson scattering in large-scale laser plasmas produced at high repetition rate
M Kaloyan1, S Ghazaryan1, C G Constantin1
1Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095, USA.
The Review of Scientific Instruments
|October 2, 2021
Summary
Optical Thomson scattering measured electron density and temperature in a 1 Hz exploding laser plasma. This new diagnostic allows for precise measurements within the plasma, revealing transitions in scattering behavior.
Area of Science:
- Plasma Physics
- Laser-Induced Plasmas
- Spectroscopy
Background:
- Exploding laser plasmas are crucial for various applications.
- Previous diagnostics were limited to single shots and lower energies.
- High-repetition-rate measurements are needed for detailed plasma characterization.
Purpose of the Study:
- To present optical Thomson scattering measurements in a high-repetition-rate exploding laser plasma.
- To characterize electron density and temperature at various points within the plasma.
- To demonstrate a novel, high-repetition-rate Thomson scattering diagnostic.
Main Methods:
- Utilized optical Thomson scattering with a high-repetition-rate (1 Hz) laser system.
- Employed motorized stages for automated translation of the scattering volume.
- Analyzed scattered light spectra to determine plasma parameters.
Main Results:
- Measured electron densities around 4 × 10^16 cm^-3 and temperatures around 7 eV.
- Observed a transition from collective to non-collective scattering with increasing distance from the target.
- Achieved density measurements within 10% agreement with Raman scattering calibration.
Conclusions:
- The developed Thomson scattering diagnostic is effective for high-repetition-rate laser plasmas.
- The measurements provide valuable data on plasma properties and scattering regimes.
- The findings contribute to a better understanding of laser-produced plasmas.
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