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All posts by Christopher Boucher

How to Analyze Turbomolecular Pumps with COMSOL Multiphysics®

January 12, 2021

Modeling gas flow in a turbomolecular pump calls for specialized numerical methods, because at such low pressures, the gas molecules rarely collide with each other.

What Formulation Should I Use for Particle Tracing in Fluids?

December 4, 2020

The COMSOL® software gives you 4 equation formulation options when modeling particle tracing in fluids: Newtonian; Newtonian, first order; Newtonian, ignore inertial terms; and Massless.

Modeling a Pierce Electron Gun in COMSOL Multiphysics®

November 19, 2020

Cathode ray tubes, electron microscopes, spectrometers, and particle accelerators: These devices and components commonly use Pierce electron guns.

Studying the Polarization of Light with a Fresnel Rhomb Simulation

February 27, 2019

A Fresnel rhomb is a simple optical system for studying light polarization. Follow along as we simulate linearly, elliptically, and circularly polarized incident light in a Fresnel rhomb.

How to Perform a STOP Analysis with COMSOL Multiphysics®

November 5, 2018

Interested in structural-thermal-optical performance (STOP) analysis? We go over the theory, background, and how to perform such an analysis in the Ray Optics Module.

Ray Optics Simulation of Sagnac Interferometers and Ring Laser Gyros

April 20, 2018

Have you ever been in a revolving restaurant that slowly spins as you dine? This same concept can be used to understand the operating principles of Sagnac interferometers and ring laser gyros.

How to Use the New Ray Termination Feature for Geometrical Optics

May 2, 2017

You can simplify your optical simulations performed with the Ray Optics Module — including model setup and results analysis — with the Ray Termination feature. Read about how to use it here.

Sampling from Phase Space Distributions in 3D Charged Particle Beams

September 22, 2016

In the previous installment of this series, we explained two concepts needed to model the release and propagation of real-world charged particle beams. We first introduced probability distribution functions in a purely mathematical sense and then discussed a specific type of distribution — the transverse phase space distribution of a charged particle beam in 2D. Now, let’s combine what we’ve learned and find out how to sample the initial positions and velocities of 3D beam particles from this distribution.


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