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Thomson scattering on the large plasma device.

S Ghazaryan1, M Kaloyan1, W Gekelman1

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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.

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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.