Modeling quadrupole mass analyzers with OmniTrak

Linear quadrupoles are widely used for ion mass spectrometry. They can separate ions by the ratio of mass number to charge number (M/Z) without a magnetic field, leading to compact, light and inexpensive systems. An assembly consists of a source of low-energy ions that enter an extended electrostatic¬† quadrupole. The voltage applied to the lens has […]

OmniTrak: superposition of magnetic field tables

OmniTrak is our software package for charged-particle guns and beam dynamics. The solution program can read output files from HiPhi and Magnum for 3D electric and magnetic field information. These complex files record values of potential on conformal meshes. Tables are another option for field information. Tables record [Ex,Ey,Ez] or [Bx,By,Bz] on a regular box mesh. […]

Using two-dimensional field solutions in OmniTrak

An OmniTrak feature that may not be familiar is the capability to include two-dimensional field solutions from Estat or PerMag. I recently had a consulting job where this was just the thing I needed, so I thought I would take this opportunity to review why the feature is valuable and how to apply it.

There are two […]

Mapper: creating field maps from midplane data

Information on 3D electric and/or magnetic fields can be ported to the OmniTrak program for charged-particle beam physics in two forms:

Finite-element field solutions from HiPhi or Magnum.
Maps of field values on a regular grid.

With regard to the second option, the Mapper program supplied with OmniTrak is one source of field maps. In Mapper, the user enters […]

Cathode temperature in Trak and OmniTrak

Both Trak and OmniTrak can include contibutions of cathode temperature to the emittance of extracted electron beams. The theory of how the thermal energy of electrons emitted a hot cathode appears as an angular beam divergence is discussed in Sect. 10.3 of the Trak manual, Sect. 11.2 of the OmniTrak manual and the the following articles […]