Replacing Launchpad on the Mac

LaunchPad on the Mac is an attempt to replicate the main screen in Windows — an area filled with icons to launch installed programs (shortcuts in Windows parlance). There is one big difference. In Windows, users can add or remove shortcuts. In macOS, the process is performed automatically — users are prevented from making any changes. This follows from the […]

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 […]

Building solids in MetaMesh

The programs Geometer and MetaMesh are used to build three-dimensional meshes for our multi-physics solution programs using constructive solid geometry. The user has the option to assemble objects from native models (e.g., spheres, cylinders, boxes, turnings,…) or to import complex shapes from SolidWorks and other 3D CAD programs. This article reviews how to make objects with […]

GamBet shielding calculation walkthrough

In a previous article, I discussed the basis of the H*(10) standard for radiation safety. Here, I’ll continue by demonstrating techniques for shielding calculations. I’ll use a published simple benchmark calculation to compare the results to several other Monte Carlo codes and to illustrate some of the advantages of GamBet. For this, I am grateful to […]

H*(10) calculations with GamBet

I recently had an inquiry from a prospective customer. He had investigated several Monte Carlo options and was impressed with one package because the developer emphasized that the software could perform H*(10) calculations. In reality, every Monte Carlo X-ray code has this capability. The only requirement is that the user be aware of the definition. To […]