With the release of SimuSEM 3.0, defining a scan region has changed significantly!
I can help! I created a small project with four shapes and no scan region (yet). The “Run” button is disabled:
Now I will add a scan region, which specifies the size and shape of the region to be scanned, and the settings for the electron beam. In the bottom right panel:
Scroll down through the scan region properties. The defaults are probably fine to start: a “Gaussian Beam” electron gun perpendicular to the surface of the sample with a circular beam cross-section. Scroll down in the panel and do the following:
One thing to note is that the “Run” button will remain disabled until you enter a project “Name” and “Folder” for it to save its results in.