Reduced Collisions

The “reduced” collisions framework is an implementation of the ImpactCollider framework in the Visual Setup. Processes in this framework are limited to kinetic particles interacting via elastic, excitation, ionization, and a set of charge exchange and momentum exchange collisions with a background gas species.

The “reduced” collisions are available when particles in the Basic Settings element is set to include particles and the collision framework is set to reduced. This will add a “ReducedCollisions” element to appear with in the “Particle Dynamics” element.

Electron Neutral Fluid Collisions

To include a collision process, right-click on the Electron Neutral Fluid Collision in the element tree and choose Add CollisionProcess to choose one of either Elastic, Excitation, or Ionization.

neutral gas

Select the neutral gas to use in the collision. The drop down will automatically populate with available pre-defined BackgroundGases elements.

impact particles

Select the electron particles to use in the collision. The drop down will automatically populate with available pre-defined KineticParticles of kind = Electrons.

Elastic

kind (not editable)

Elastic

cross section type

The cross section for the collision must be specified. You can choose whether to use built in cross sections, cross sections from the Evaluated Electron Data Library (EEDL) or by specifying your own user defined cross sections in a text file.

• user defined cross section

  User provided cross-section data provided in a text file. For more information on the format of the file, please see OAFunc Cross-Section Interface.

  cross section data file

  The name of the file containing the cross-section data.

• product distribution

  The type of scattering.

  • isotropic

  • Vahedi-Surendra

Excitation

kind (not editable)

Excitation

cross section type

The cross section for the collision must be specified. You can choose whether to use built in cross sections, cross sections from the Evaluated Electron Data Library (EEDL) or by specifying your own user defined cross sections in a text file.

• user defined cross section

  User provided cross-section data provided in a text file. For more information on the format of the file, please see OAFunc Cross-Section Interface.

  cross section data file

  The name of the file containing the cross-section data.

• product distribution

  The type of scattering:

  • isotropic

  • Vahedi-Surendra

Ionization

kind (not editable)

Ionization

product electrons

The resultant electrons from the impact ionization collision.

product ions

The resultant ions from the impact ionization collision.

cross section type

The cross section for the collision must be specified. You can choose whether to use built in cross sections, cross sections from the Evaluated Electron Data Library (EEDL) or by specifying your own user defined cross sections in a text file.

• user defined cross section

  User provided cross-section data provided in a text file. For more information on the format of the file, please see OAFunc Cross-Section Interface

  cross section data file

  The name of the file containing the cross-section data.

• product distribution

  The type of scattering:

  • isotropic

  • Vahedi-Surendra

Ion Neutral Fluid Collisions

To include a collision process, right-click on the Ion Neutral Fluid Collision in the element tree and choose Add CollisionProcess to choose one of either Charge Exchange or Momentum Exchange.

neutral gas

Select the neutral gas to use in the collision. The drop down will automatically populate with available pre-defined BackgroundGases elements.

impact particles

Select the charged particles to use in the collision. The drop down will automatically populate with available pre-defined KineticParticles of kind = Charged Particles.

Charge Exchange

kind (not editable)

Charge Exchange

cross section type

The cross section for the collision must be specified. You can choose whether to use built in cross sections, cross sections from the Evaluated Electron Data Library (EEDL) or by specifying your own user defined cross sections in a text file.

• built in

  The built-in collisions utilize existing internal collision cross-section data.

• user defined cross section

  User provided cross-section data provided in a text file. For more information on the format of the file, please see OAFunc Cross-Section Interface.

  cross section data file

  The name of the file containing the cross-section data.

• product distribution

  The type of scattering.

  • backward

Momentum Exchange

kind (not editable)

Momentum Exchange

cross section type

The cross section for the collision must be specified. You can choose whether to use built in cross sections, cross sections from the Evaluated Electron Data Library (EEDL) or by specifying your own user defined cross sections in a text file.

• built in

  The built-in collisions utilize existing internal collision cross-section data.

• user defined cross section

  User provided cross-section data provided in a text file. For more information on the format of the file, please see OAFunc Cross-Section Interface

  cross section data file

  The name of the file containing the cross-section data.

• product distribution

  The type of scattering.

  isotropic