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 Composer 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