8.6. Bremsstrahlung

class cherab.core.model.plasma.bremsstrahlung.Bremsstrahlung

Emitter that calculates bremsstrahlung emission from a plasma object.

The bremmstrahlung formula implemented is equation 2 from M. Beurskens, et. al., ‘ITER LIDAR performance analysis’, Rev. Sci. Instrum. 79, 10E727 (2008),

\[\epsilon (\lambda) = \frac{0.95 \times 10^{-19}}{\lambda 4 \pi} \sum_{i} \left(g_{ff}(Z_i, T_e, \lambda) n_i Z_i^2\right) n_e T_e^{-1/2} \times \exp{\frac{-hc}{\lambda T_e}},\]

where the emission \(\epsilon (\lambda)\) is in units of radiance (ph/s/sr/m^3/nm).

Variables

• 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.

• gaunt_factor (FreeFreeGauntFactor) – Free-free Gaunt factor as a function of Z, Te and wavelength. If not provided, the atomic_data is used.