VSim for Plasma Discharges

VSimPDperforms state-of-the-art kinetic modeling of plasma discharges that allows the resolution of kinetic effects for these discharges that are not observable in fluid simulations.

VSim sputtering magnetron modelVSim for Plasma Discharges (VSimPD) is a flexible, multiplatform, high-performance, parallel software tool for numerically efficient kinetic simulations of arbitrary pressure gas discharges. VSimPD computes full kinetics for arbitrary pressure gas discharges including the effects of elastic, excitation, and ionization collisions between electrons, ions, and neutral particles using Particle-In-Cell Monte Carlo (PIC-MCC) and PIC-DSMC methods and also including charge exchange, electron recombination, sputtering, and secondary emission. In the process it can also compute surface charging. Dielectric and metallic shapes can be rapidly imported from CAD files or constructed in the user-friendly front end, VSimComposer and are rapidly meshed with the proprietary VMesh algorithm. With VSim for Plasma Discharges, you will have the ability to solve full size problems rapidly in R-Z geometry or fully three dimensional.

VSim for Plasma Discharges can be used in the design cycle for plasma discharge and gaseous electronics devices. VSimPD simulates Capacitively Coupled Plasma Discharge Chambers. VSim can model plasma thrusters, including ion thrusters and Hall thrusters. It simulates satellite surface charging and dielectric barrier discharges. With its electrostatic computing capabilities, VSimPD can be used to simulate sputtering magnetrons.

The rich set of examples accompanying VSim for Plasma Discharges reduces your learning curve and enables you to obtain immediate results in plasma discharge simulation. VSim for Plasma Discharges performs accurate simulations of a full scale device by exploiting parallel computing power on any platform: Linux, Windows, or Mac OS X.

Features

  • Steady-state operation
  • Electrostatic Solver
  • Variable Weight particles
  • Monte Carlo collisions, including:
    • ionization
    • recombination
    • elastic
    • excitation/inelastic
    • combination
    • split
    • initial load
    • secondaries
  • Particle sinks
  • Surface charge
  • Cartesian, cylindrical coordinates
  • Grid Boundaries
  • Field ionization

Advantages

  • Capture kinetic physics not available in other models
    • Valid from low to high pressures, large range of densities
    • Captures non-local effects
  • Physics you need for your problems:
    • collisions
    • multiple species
    • wall interaction
    • emitters
  • Leverage modern computing systems to quickly get accurate answers

Questions? Contact us.

 

Example Simulations Included

These example problems that demonstrate collisions and plasma reactions are included with VSim for Plasma Discharges to jumpstart finding the solution to your problem:

Textbook Examples Using Visual Setup
Real World Examples Using Visual Setup
 
 

VSim Animation

Arrayed Waveguide Grating Simulated in Demultiplexing Mode

In this simulation, the fundamental mode is launched using a unidirectional wave launcher. Matching Absorbing Layers prevent reflections from simulation boundary. B_z is displayed in this visualization. The wave is coupled to the ring and next to the second waveguide.

Silicon Waveguide in Silica Cladding

Shown in the visualization are positive and negative contours (red and blue) of B_y. The clipped views with multiple contours of B_y are shown in the multicolored scenes. The unidirectionality of the mode launcher enables arbitrary placement of the wave source along the waveguide. Matched Absorbing Layers (MAL) reduce reflections at simulation boundaries.

 
Microring Resonator Simulation Setup and Visualization

The simulation geometry is set up in VSim using the graphical user interface. The visualization displays B_z. Matching Absorbing Layers prevent reflections from the simulation. The wave is coupled to the ring and next to the second waveguide. The fundamental mode is launched using a unidirectional wave launcher.

 
Colliding Laser Pulses Launch an Electron Beam into a Plasma Accelerator

This simulation visualization by Estelle Cormier-Michel of Tech-X was one of the 2011 U.S. Department of Energy's Scientific Discovery through Advanced Computing (SciDAC) program OASCR (for Office of Advanced Scientific Computing Research) award winners.

Laser-Wakefield Accelerators "Dream Beam"

All different incarnations of laser-wakefield accelerators. It shows the background electron density (surface) plus some high-energy particles (beam) as particles.

 
Magnetic Field

The electron density in a 2D simulation of the expansion of a two-component plasma (electrons, ions, at same temperature) in an ambient magnetic field (out of plane). It initially expands symmetrically, but due to the charge separation (on average faster electrons than ions), the electrons get pulled back into the center, leading to some radial oscillations. The ambient magnetic field causes the rotation.

That's a configuration as encountered e.g. after ignition of the target in an Inertial confinement Fusion experiment. This shows that the debris created in an ICF chamber could be confined by a strong magnetic field, thus protecting e.g. the optical inlets into the chamber.

Magnetron

A Magnetron simulation created using VSim.

 
Multipactor Comparison

The video shows a side-by-side comparison of the 2 secondary electron models and how the resonance zone of the realistic model is much wider than that of the simple model.

Photocathode Modeling

Photocathode simulation modeling performed with VSim. Animation created with POV-Ray.

 
TESLA Cavity

Different incarnations of the wakefields generated by the propagation of an electron beam in a TESLA cavity.

 

Plasma Sheath

ITER2x3sheath

Sheath potential on ITER ICRF antenna.

Sheath Plasma Current

This movie shows one of the 24 modules of the ITER RF antenna, immersed in plasma, with a sheath model. Left plot shows sheath potential and right plot shows Je plasma current.

 

Modeling ICRF Heating in Alcator C-Mod

Geometry Construction

This movie gives some detail on the construction of the geometry used to simulate Alcator C-Mod's field-aligned ICRF antenna in VSim. CAD files from the antenna (provided by MIT engineers) are imported to the VSim grid; thereafter, the antenna module is embedded in a half-torus rendering of C-Mod's vacuum vessel. Finally, an equilibrium plasma density profile (provided by MIT scientists) is loaded into the vessel.

Electric Field Contours

Vertical component of the electric field induced by the field-aligned ICRF antenna in the Alcator C-Mod device, in a simulation which imports plasma density and magnetic field profiles from experimental data. The geometry of the simulation is described in Modeling ICRF Heating in Alcator C-Mod: Geometry Construction. The phasing of the antenna straps is [0, π, 0, π]; complex patterns of fast wave propagation into and through the plasma core are clearly visible.

Plasma with Electric Field

Vertical component of the electric field induced by the field-aligned ICRF antenna in the Alcator C-Mod device, in a simulation which imports plasma density and magnetic field profiles from experimental data. In this animation the plasma profile is also shown; the data is the same as was used in Modeling ICRF Heating in Alcator C-Mod: Electric Field Contours, though the view is slightly different. The phasing of the antenna straps is [0, π, 0, π]; complex patterns of fast wave propagation into and through the plasma core are clearly visible.

Midplane Electric Field

Vertical component of the electric field induced by the field-aligned ICRF antenna in the Alcator C-Mod device, in a simulation which imports plasma density and magnetic field profiles from experimental data. In this animation the toroidal midplane of the device is shown; the data is the same as was used in Modeling ICRF Heating in Alcator C-Mod: Plasma with Electric Field, though the view is slightly different. The phasing of the antenna straps is [0, π, 0, π].

 
Poloidal Plane Electric Field

Vertical component of the electric field induced by the field-aligned ICRF antenna in the Alcator C-Mod device, in a simulation which imports plasma density and magnetic field profiles from experimental data. In this animation a two-dimensional poloidal cut across the antenna coax feeds is shown; the phasing of the antenna straps is [0, π, 0, π].

 

NIMROD

current3D

3D NIMROD simulation of the toroidal current density evolution based on an initial 2D reconstructed state from the DIII-D tokamak. This experimental discharge was characterized by an edge-localized mode free state with edge harmonic oscillations. See https://nimrodteam.org and https://fusion.gat.com/global/DIII-D for more information.

pressure3D

3D NIMROD simulation of the pressure evolution based on an initial 2D reconstructed state from the DIII-D tokamak. This experimental discharge was characterized by an edge-localized mode free state with edge harmonic oscillations. See https://nimrodteam.org and https://fusion.gat.com/global/DIII-D for more information.

 
VSim capacitively coupled plasma simulation model
Capacitively Coupled Plasma

Highest fidelity plasma models for capacitively coupled discharges, including all kinetic effects.




VSim kinetic collisions simulation

Kinetic Collisions

Electrostatic transport of a H-beam in a background gas of H2.

 
VSim cylindrical hall thruster magnetic field simulation
Cylindrical Hall Thruster

Simulation of a Stationary Plasma Thruster-100 (SPT-100) kinetically tracks electrons, xenon ions and sputtered hBN wall materials.



VSim model of satellite surface charging

Satellite Charging

Surface charging and plasma discharge modeling for simulations of spacecraft and their environments.

 

 
VSim ion thruster model
Advanced Dipole Above Conducting Plane

Simulation of a 40 cm diameter, 3-ring magnet cylindrical ion thruster discharge chamber plasma process kinetically tracking electrons (both primary and secondaries), xenon ions (singly charged and doubly charged), and xenon neutrals.

 

VSim logo

Pay Only for the Functionality You Need

 

VSim packages provide the pricing flexibility and convenience you want.  Choose the package or set of packages that has the physics simulation functionality that you need.

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Fast, Powerful FDTD for Electromagnetics that solves electromagnetic problems. More...

VSim klystron model thumbnailVSim for Microwave Devices logo
Electromagnetic and particle modeling features for magnetrons, klystrons, and More...

vsim capacitively coupled plasma 2D model thumbnailVSim for Plasma Discharges logo
Enables resolution of kinetic effects for discharges not observable in fluid simulations.  More...

VSim colliding laser pulse 3D model thumbnailVSim for Plasma Acceleration logo
Large-scale simulations of laser-plasma and beam-plasma acceleration experiments.  More...

 

VSim packages provide you with a diverse range of relevant examples, macros and the powerful graphical user interface to the simulation engine, together with embedded analysis tools. Functionality is collected in common packages to provide the pricing flexibility and convenience you want. Custom packages are also available to give even more flexibility in pricing. See the VSim Features Matrix.

Request a free VSim Evaluation or contact Tech-X Sales for a quote.

 

Online Tutorials

Watch VSim Video Tutorials on YouTube

 
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