Collisions (plasmapy.formulary.collisions)

Formulas related to particle collisions in plasmas.

Sub-Packages & Modules

coulomb

Calculation of Coulomb logarithms and cross-sections.

dimensionless

Dimensionless numbers related to particle collisions.

frequencies

Frequencies related to particle collisions.

helio

Functionality related to collisions in heliospheric plasma.

lengths

Lengths related to particle collisions.

misc

Miscellaneous parameters related to particle collisions.

Classes

MaxwellianCollisionFrequencies(...)

Compute collision frequencies between two slowly flowing Maxwellian populations.

SingleParticleCollisionFrequencies(...)

Compute collision frequencies between particles.
Inheritance diagram of plasmapy.formulary.collisions.frequencies.MaxwellianCollisionFrequencies, plasmapy.formulary.collisions.frequencies.SingleParticleCollisionFrequencies

Functions

Bethe_stopping(I, n, v, z)

The theoretical electronic stopping power for swift charged particles calculated from the Bethe formula.

Bethe_stopping_lite(I, n, v, z)

The lite-function version of Bethe_stopping.

collision_frequency(T, Unit], n, Unit], ...)

Collision frequency of particles in a plasma.

Coulomb_cross_section(impact_param)

Cross-section for a large angle Coulomb collision.

Coulomb_logarithm(T, Unit], n_e, Unit], ...)

Compute the Coulomb logarithm.

coupling_parameter(T, Unit], n_e, Unit], ...)

Ratio of the Coulomb energy to the kinetic (usually thermal) energy.

fundamental_electron_collision_freq(T_e, ...)

Average momentum relaxation rate for a slowly flowing Maxwellian distribution of electrons.

fundamental_ion_collision_freq(T_i, n_i, ion)

Average momentum relaxation rate for a slowly flowing Maxwellian distribution of ions.

impact_parameter(T, Unit], n_e, Unit], ...)

Impact parameters for classical and quantum Coulomb collision.

impact_parameter_perp(T, Unit], species, V, ...)

Distance of the closest approach for a 90° Coulomb collision.

Knudsen_number(characteristic_length, T, ...)

Knudsen number (dimensionless).

mean_free_path(T, Unit], n_e, Unit], ...)

Collisional mean free path (m).

mobility(T, Unit], n_e, Unit], species, ...)

Return the electrical mobility.

Spitzer_resistivity(T, Unit], n, Unit], ...)

Spitzer resistivity of a plasma.

temp_ratio(*, r_0, r_n, n_1, n_2, v_1, T_1, T_2)

Calculate the thermalization ratio for a plasma in transit.

Example notebooks

Coulomb logarithms