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Measuring Spatially- and Directionally-varying Light Scattering from Biological Material

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Measurement of Thomson-scattering spectra with continuous angular resolution (invited).

J Katz¹, R Boni¹, A L Milder¹

¹Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA.

The Review of Scientific Instruments

|September 6, 2024

Summary

A new Thomson-scattering diagnostic was developed to study electron plasma properties. This tool measures electron velocity distributions without mathematical assumptions, advancing plasma physics research.

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Area of Science:

Plasma Physics
Laser-Induced Plasmas
Spectroscopy

Background:

Characterizing high-energy plasmas is crucial for fusion energy research.
Understanding electron velocity distribution functions (EVDFs) is key to validating plasma models.
Existing diagnostics have limitations in probing EVDFs over wide ranges.

Purpose of the Study:

To develop and implement a novel Thomson-scattering diagnostic for detailed plasma characterization.
To enable measurements of EVDFs without prior assumptions on their mathematical form.
To probe a wide range of plasma frequencies and wave vectors in laser-produced plasmas.

Main Methods:

A Thomson-scattering diagnostic with 120° continuous angular resolution was designed and built.
Key components include a reflective objective, spatial filter, cylindrical optics, spectrometer, and gated camera.
Spectra of scattered light were analyzed as a function of emission angle and wavelength.

Main Results:

The diagnostic achieved 0.8-nm spectral and 1° angular resolution.
It successfully measured EVDF properties in gas-jet plasmas heated by inverse bremsstrahlung.
Data provided critical constraints for plasma physics models.

Conclusions:

The novel diagnostic offers efficient probing of plasma parameters over broad ranges.
It enables accurate, assumption-free measurements of EVDFs.
This advancement is vital for interpreting experimental data and refining plasma physics models.