Electrons

Electrons are pre-defined to have a charge = -1.602176487e-19 C and a mass = 9.10938215e-31 kg.

To add Electrons, right click on the “KineticParticles” element, hover over the “Add ParticleSpecies” and choose “Electrons”.

kind (not editable):

Electrons

nominal density:

A positive value suggesting the nominal density for the particles. This will be used in conjunction with the weight setting to compute the density, weights, and number of particles in a macro particle for your kinetic particles.

description

A space to provide a descriptive comment for the particle species.

particle dynamics:

Whether to use relativistic or non-relativistic particles.

• relativistic: Use the relativistic particle pushing algorithm to update the particle positions and velocities by including a gamma term.
• non-relativistic: Use the non-relativistic particle pushing algorithm to update the particle positions and velocities.

particle weights:

Whether to use constant or variable weight particles.

• variable weights: The weights of the macroparticles can vary throughout the simulation.

• constant weights: The weights of the macroparticles are constant throughout the simulation.

• managed weights: Variable weight particles that are managed to allow for maximum and minimum weights, and maximum and minimum number of macroparticles per cell. Note if working in cylindrical coordinates, some computational artifacts may arise in a few simulation types with managed weights. Contact Tech-X support if this becomes a concern.

  macroparticles per cell for splitting:

  If more than this many macroparticles are in a cell splitting will not occur.

  macroparticles per cell for combining:

  If fewer than this many macroparticles are in a cell combining will not occur.

  minimum split particle weight:

  If the split particles would weigh under this value, splitting will not occur.

  maximum combined particle weight:

  If the combined particle would weigh over this value, combination will not occur.

  splitting periodicity:

  Number of time steps between assessing if particles should be split.

  combining periodicity (not editable):

  Number of time steps between assessing if particles should be combined.

  splitting algorithm:

  Algorithm to use in determining split particle weights.

  combining algorithm:

  Algorithm to use in determining combined particle weights.

weight setting:

Whether to use computed weights or explicitly set weights.

• computed weights:

  Let VSim calculate your macroparticle weights for you based on the number of macroparticles per cell you specify as well as the nominal density. The weights are calculated such that the number of particles in a macro particle is equal to the nominalDensity * cellVolume / macroparticles per cell.

  macroparticles per cell: The number of macroparticles per cell.

• explicitly set weights:

  Declare the number of particles in a macro particle explicitly.

  particles per macroparticle: The number of particles in a macroparticle.