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Thomson scattering on the large plasma device
S Ghazaryan1, M Kaloyan1, W Gekelman1
1Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095, USA.
The Review of Scientific Instruments
|September 1, 2022
Summary
A new Thomson scattering diagnostic was developed for electron density and temperature measurements on the Large Plasma Device. This system effectively measures plasma parameters, offering valuable data for fusion research.
Area of Science:
- Plasma Physics
- Experimental Diagnostics
Background:
- Accurate measurement of plasma parameters like electron density and temperature is crucial for understanding plasma behavior.
- Existing diagnostic methods may have limitations in specific plasma environments.
Purpose of the Study:
- To develop and validate a non-collective Thomson scattering diagnostic system.
- To measure electron density and temperature in the Large Plasma Device.
Main Methods:
- Utilized a triple grating spectrometer with a tunable notch filter to isolate weak Thomson scattering signals from stray light.
- Calibrated the diagnostic system using Raman scattering.
- Commissioned the system for initial plasma measurements.
Main Results:
- Successfully measured electron densities ranging from 4.0 × 10^12 to 2.8 × 10^13 cm^-3.
- Measured electron temperatures varied between 1.2 and 6.8 eV.
- Analyzed the variation of measurement error with plasma parameters.
Conclusions:
- The developed Thomson scattering diagnostic is effective for measuring electron density and temperature in the Large Plasma Device.
- The system provides reliable data across a range of plasma conditions.
- Further analysis of measurement errors contributes to diagnostic accuracy.
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