8.8. Basic Line Emission

class cherab.core.model.plasma.impact_excitation.ExcitationLine

Emitter that calculates spectral line emission from a plasma object as a result of excitation of the target species by electron impact.

$${ϵ}_{\mathrm{excit}}(\lambda )=\frac{1}{4\pi }{n}_{Z_{\mathrm{i}}}{n}_{\mathrm{e}}{\mathrm{PEC}}_{\mathrm{excit}}(n_{\mathrm{e}},T_{\mathrm{e}})f(\lambda ),$$

where $n_{Z_{\mathrm{i}}}$ is the target species density, ${\mathrm{PEC}}_{\mathrm{excit}}$ is the electron impact excitation photon emission coefficient for the specified spectral line of the $Z_{\mathrm{i}}$ ion, $f(\lambda )$ is the normalised spectral line shape,

Parameters:

• line (Line) – Spectroscopic emission line object.

• plasma (Plasma) – The plasma to which this emission model is attached. Default is None.

• atomic_data (AtomicData) – The atomic data provider for this model. Default is None.

• lineshape (object) – Line shape model class. Default is None (GaussianLine).

• lineshape_args (object) – A list of line shape model arguments. Default is None.

• lineshape_kwargs (object) – A dictionary of line shape model keyword arguments. Default is None.

Variables:

• plasma (Plasma) – The plasma to which this emission model is attached.

• atomic_data (AtomicData) – The atomic data provider for this model.

class cherab.core.model.plasma.recombination.RecombinationLine

Emitter that calculates spectral line emission from a plasma object as a result of dielectronic recombination of the target species.

$${ϵ}_{\mathrm{recomb}}(\lambda )=\frac{1}{4\pi }{n}_{Z_{\mathrm{i}}+1}{n}_{\mathrm{e}}{\mathrm{PEC}}_{\mathrm{recomb}}(n_{\mathrm{e}},T_{\mathrm{e}})f(\lambda ),$$

where $n_{Z_{\mathrm{i}}+1}$ is the recombining species density, ${\mathrm{PEC}}_{\mathrm{recomb}}$ is the dielectronic recombination photon emission coefficient for the specified spectral line of the $Z_{\mathrm{i}}$ ion, $f(\lambda )$ is the normalised spectral line shape,

Parameters:

• line (Line) – Spectroscopic emission line object.

• plasma (Plasma) – The plasma to which this emission model is attached. Default is None.

• atomic_data (AtomicData) – The atomic data provider for this model. Default is None.

• lineshape (object) – Line shape model class. Default is None (GaussianLine).

• lineshape_args (object) – A list of line shape model arguments. Default is None.

• lineshape_kwargs (object) – A dictionary of line shape model keyword arguments. Default is None.

Variables:

• plasma (Plasma) – The plasma to which this emission model is attached.

• atomic_data (AtomicData) – The atomic data provider for this model.

class cherab.core.model.plasma.thermal_cx.ThermalCXLine

Emitter that calculates spectral line emission from a plasma object as a result of thermal charge exchange of the target species with the donor species.

$${ϵ}_{\mathrm{CX}}(\lambda )=\frac{1}{4\pi }{n}_{Z_{\mathrm{i}}+1}\sum _j{n}_{Z_{\mathrm{j}}}{\mathrm{PEC}}_{\mathrm{cx}}(n_{\mathrm{e}},T_{\mathrm{e}},T_{Z_{\mathrm{j}}})f(\lambda ),$$

where $n_{Z_{\mathrm{i}}+1}$ is the receiver species density, $n_{Z_{\mathrm{j}}}$ is the donor species density, ${\mathrm{PEC}}_{\mathrm{cx}}$ is the thermal CX photon emission coefficient for the specified spectral line of the $Z_{\mathrm{i}}$ ion, $T_{Z_{\mathrm{j}}}$ is the donor species temperature, $f(\lambda )$ is the normalised spectral line shape,

Parameters:

• line (Line) – Spectroscopic emission line object.

• plasma (Plasma) – The plasma to which this emission model is attached. Default is None.

• atomic_data (AtomicData) – The atomic data provider for this model. Default is None.

• lineshape (object) – Line shape model class. Default is None (GaussianLine).

• lineshape_args (object) – A list of line shape model arguments. Default is None.

• lineshape_kwargs (object) – A dictionary of line shape model keyword arguments. Default is None.

Variables:

• plasma (Plasma) – The plasma to which this emission model is attached.

• atomic_data (AtomicData) – The atomic data provider for this model.