Class:Diag_ThomsonScattering

The Diag_ThomsonScattering class simulates measurements obtained from a Thomson scattering diagnostic, which provides localized values of electron density (ne) and electron temperature (Te) within a plasma.

Properties

  • R, Z: Horizontal and vertical coordinates of the measurement points.
  • ne: Measured electron density at the defined positions, including noise.
  • Te: Measured electron temperature at the defined positions, including noise.
  • ideal: Structure containing the ideal (noise-free) values of ne and Te.
  • unit_ne: Unit for electron density, typically "m^{-3}".
  • unit_Te: Unit for electron temperature, typically "eV".
  • config: Structure containing noise configuration and diagnostic setup parameters.

Methods

measure(equi)

Performs synthetic Thomson scattering measurements using equilibrium data.

  • Electron density (ne) and temperature (Te) are interpolated from the equilibrium grid at the specified diagnostic positions.
  • These interpolated values are stored in ideal.ne and ideal.Te.
  • Noise is added to simulate realistic measurements:
    • Absolute noise: Added independently of the signal’s magnitude.
    • Proportional noise: Scales with the signal’s value.
  • Final values including noise are stored in ne and Te.

Upload(configuration)

Initialises the diagnostic setup by defining measurement positions and noise parameters.

  • If no configuration is specified, defaults to configuration 1.
  • Measurement positions are generated as linear arrays in R and Z.
  • All noise levels (absolute and proportional) are initialized to zero unless specified otherwise.

Plotting Methods

plot_geo()

Plots the spatial distribution of the Thomson scattering measurement points in the poloidal plane.

plot_Ne_meas()

Plots the measured electron density values.

plot_Te_meas()

Plots the measured electron temperature values.

plot_StandAlone()

Plots both the ideal and noisy values of ne and Te side by side for comparison.

Usage Example

ts = Diag_ThomsonScattering();
ts = ts.Upload();             % Load default configuration
ts = ts.measure(equilibrium); % Simulate measurement of ne and Te
ts.plot_StandAlone();         % Visualize results

⚠️ This documentation is still a work in progress. There may be errors or inaccuracies. Please feel free to contact us if you notice any issues.