Class:Diag_PickUpCoils

The Diag_PickUpCoils class simulates magnetic pick-up coil diagnostics, which are used to measure magnetic fields in tokamak devices. It interpolates magnetic fields from an equilibrium object and can simulate measurement noise for more realistic diagnostics.

Properties

  • R: Horizontal coordinate (in meters) of the coil position.
  • Z: Vertical coordinate (in meters) of the coil position.
  • n: Normal unit vector of the coil, representing the direction in which the magnetic field is projected.
  • B: Simulated magnetic field measurement, including noise.
  • ideal: Structure containing the ideal (noise-free) magnetic field measurement.
  • unit: Unit of measurement, typically "T" (Tesla).
  • config: Structure with configuration settings, including parameters for random absolute and proportional noise.

Methods

measure(equi)

Computes the magnetic field measured by each pick-up coil.

  • Interpolates the magnetic field components (Br, Bt, Bz) from the equilibrium grid to the coil positions.
  • Projects the field along the coil’s normal direction n.
  • Adds configurable random noise (both absolute and proportional) to simulate realistic diagnostics.
  • Stores both the noisy and ideal measurements.

Upload(configuration)

Loads a predefined coil configuration.

  • If no argument is provided, default configuration 1 is used.
  • Imports coil positions and directions from an external .mat file (e.g., PickUpData_config_1.mat).
  • Initializes the noise parameters.

Plotting Methods

plot_geo()

Plots the spatial distribution of the pick-up coils in the poloidal plane.

plot_meas()

Plots the measured magnetic field values for each coil.

plot_StandAlone()

Plots both the ideal and noisy magnetic field measurements for comparison.

Usage Example

pickup = Diag_PickUpCoils();            % Initialise PickUpCoils object
pickup = pickup.Upload();               % Load default configuration
pickup = pickup.measure(equilibrium);   % Simulate measurement
pickup.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.