Atomic Data¶

Name	Description	Preview
Photon Emissivity Coefficients	Sampling and plotting PEC rates provided by OPEN-ADAS.
Beam-Plasma Interaction Rates	Sampling and plotting various beam-plasma interaction rates provided by OPEN-ADAS.
Fractional Abundances	Sampling and plotting Neon fractional abundances with the ADAS subscription package.	$../_images/fractional_abundance.png$
Radiated Powers	Sampling and plotting total and stage resolved radiated powers with the ADAS subscription package.

Creating Plasmas¶

Name	Description	Preview
Analytic Functions	Specifying plasma distributions with analytic functions.
Flux Function Plasmas	Loading the example EFIT equilibrium and making 1D flux functions.
2D Mesh Plasmas	Specifying a plasma distribution with a 2D r-z triangular mesh.
Slab Plasma	Constructing a slab of plasma defined along +ve x.
Beams into Plasmas	Specifying a mono-energetic neutral beam that interacts with a plasma.

Surface Radiation Loads¶

Name	Description	Preview
Defining A Radiation Function	Defining an example radiation function.
Defining A Wall From A 2D Polygon	A toroidal mesh representing the tokamak wall is made from a 2D polygon outline.
Symmetric Power Load Calculation	Calculating the power load by exploiting symmetry. We manually create an array of detectors for sampling.
Mesh Observer	Calculating powers on an arbitrary 3D surface (Raysect docs).
AUG - SOLPS radiation load example	An older demonstration of the tutorials above using a SOLPS simulation and an AUG wall outline.

Active Spectroscopy¶

Name	Description	Preview
Charge Exchange Spectroscopy (CXS)	A simple CXS model for a beam into a plasma slab.
Beam Emission Spectroscopy	A simple Beam Emission Spectroscopy (BES) model for a beam into a plasma slab.

Passive Spectroscopy¶

Name	Description	Preview
Impact Excitation and Recombination	Modelling background lines due to electron impact excitation and recombination.
Multiplet Line Ratios	Including experimentally determined multiplet line ratios.
Zeeman Spectroscopy	Specifying a Zeeman triplet or multiplet line shapes.
Stark Broadened Lines	Specifying a Stark broadened lineshape.
Stark-Zeeman Lines	Modelling Stark-Zeeman lineshapes.

Bolometry¶

Name	Description	Preview
Camera From Primitives	Designing a simple bolometer camera using raysect primitives
Camera From Mesh and Coordinates	Designing a simple bolometer camera using a mesh file and vertex coordinates
Observing a Radiation Function	Calculating the measured power and radiance on bolometer from a 3D radiation function
Calculating the Etendue	Calculating the etendue of a bolometer detector
Geometry Matrix Calculation Using Voxels	Calculating the geometry matrix for a bolometer system using the voxel framework
Bolometer Inversions Using Voxels	Performing inversions using geometry matrices and the voxel framework
Geometry Matrix Calculation Using Ray Transfer Objects	Calculating the geometry matrix for a bolometer system using ray transfer objects
Bolometer Inversions Using Ray Transfer Objects	Performing inversions using geometry matrices from a ray transfer object

Geometry Matrices¶

Name	Description	Preview
Rectangular regular grid	Calculating the geometry matrix for a rectangular emitter defined on a regular grid.
Cylindrical regular grid	Calculating the geometry matrix for a cylindrical emitter defined on a regular grid.
Axisymmetrical (toroidal) regular grid	Calculating the geometry matrix for an axisymmetrical toroidal emitter defined on a regular grid. Applying a mask to filter out extra grid cells.
Axisymmetrical (toroidal) regular grid with custom mapping of light sources	Mapping multiple grid cells into a single light source.

Code examples gallery¶

Note

These code examples are included for historical reasons. They may require specific (sometimes older) versions of Cherab’s submodules to work. Many also require access to specific machine data.

Name	Description	Preview
CXRS Quickstart	Commented demo file about how to use Cherab for JET CX simulations.
#76666 sample analysis	Demo CX analysis for pulse 76666 at t=61s
MAST-U filtered cameras	Example of using SOLPS simulation and ADAS rates to model filtered cameras.
MAST-U SOLPS plasma	Example of loading a plasma from a SOLPS simulation and inspecting the various plasma species parameters.
Custom Emission Model	Example of making a custom emitter class in Cherab. D-alpha impact excitation is used for the example.
Measuring line of sight spectra	Basic balmer series measurement in the MAST-U divertor with an optical fibre. Localisation of the plasma emission is examined by plotting profiles of parameters such as density and temperature along the ray trajectory.