Our online tutorials include a growing selection of articles on techniques for finite-element modeling. You can download them from our Technical Library at:
http://www.fieldp.com/library.html
Here’s a list of current entries:
Calculating Mutual Capacitance with HiPhi
A review of the accurate field-energy method to find the capacitance matrix between any set of electrodes.
Designing a Converging-beam Electron Gun and Focusing Solenoid with Trak and PerMag
How to design a high-current electron-beam gun to produce a narrow cylindrical beam for applications such as high-power microwave generation and electron-beam welding.
Emittance calculations in Trak
A review of the concept of beam emittance and the methods used in Trak to calculate the quantity. The tutorial also discusses conventions for determining the emittance of circular beams.
Magnetic Dipole Moment of a Coil Assembly
The field from most magnetic assemblies approaches a dipole variation at large distance. A knowledge of the dipole moment is useful to find forces and torques on the assembly from the earth’s field and also to estimate fringe fields at large distances. This report report discusses how boundaries affect the accuracy for estimating the dipole-moment and gives tips for setting up effective calculations.
Designing Magnetic Shields with PerMag and Magnum
A discussion of the theory of magnetic shielding and a review of useful techniques for finite-element calculations.
Simulating a Planar Electron-beam Gun with OmniTrak
A walk-through discussion of a complete OmniTrak simulation of a three-dimensional, relativistic electron-beam gun designed at the Stanford Linear Accelerator Center.
Representing Cathode Temperature Effects in Trak and OmniTrak
Trak and OmniTrak have the unique ability to combine thermal distributions with self-consistent space-charge-limited emission for accurate simulations of high-brightness electron-beam guns. This report reviews the methods used in the codes and introduces the important topic of temperature-selection at a space-charge extraction sheath.