Examinations of electron temperature calculation methods in Thomson scattering diagnostics

Area of Science:

• Plasma physics
• Atomic and molecular physics
• Spectroscopy

Background:

• Electron temperature is a critical plasma parameter.
• Thomson scattering is a key diagnostic technique.
• Indirect calculation methods are sensitive to signal noise.

Purpose of the Study:

• To investigate the impact of signal noise on electron temperature calculations.
• To evaluate the reliability of the chi-square test for Thomson scattering data.
• To propose and assess an alternative calculation method.

Main Methods:

• Simulations were performed to analyze noise effects.
• The chi-square test was examined under various noise conditions.
• A scale factor test was developed and applied.

Main Results:

• Signal noise significantly impacts the accuracy of the chi-square test.
• The scale factor test demonstrated improved robustness against noise.
• Reliability of electron temperature derivation is enhanced with the proposed method.

Conclusions:

• The chi-square test's dependence on signal-to-noise ratio is a limitation.
• The scale factor test offers a more reliable approach for electron temperature determination.
• This work provides a more robust method for Thomson scattering analysis.