cherab.imas.ids.radiation.load_radiation_coefficients¶

cherab.imas.ids.radiation.load_radiation_coefficients(radiation_ids, process_index: int = 0, ion_index: int = 0, emissivity_index: int = 0, grid_subset_index: int | None = None) → NDArray[float64]Source¶

Load JOREK-style emissivity coefficients from a radiation IDS time slice.

This accessor targets the coefficient layout typically used by JOREK: radiation.process[i].ggd[0].ion[j].emissivity[k].coefficients.

Parameters:

radiation_ids¶

Radiation IDS object (top-level or time slice).

process_index: int = 0¶

Index of the process in the IDS process AOS.

ion_index: int = 0¶

Index of the ion entry in process[...].ggd[0].ion.

emissivity_index: int = 0¶

Index of the emissivity entry in ion[...].emissivity.

grid_subset_index: int | None = None¶

Optional subset index constraint. If provided, coefficient data is accepted only when grid_subset_index matches the emissivity entry.

Returns:

NDArray[numpy.float64] – Coefficient array, typically shaped (num_vertices * num_modes, 4).

Raises:

RuntimeError – If the requested process/ion/emissivity structure is missing or empty.