Since there is going to be a seminar on anti-matter before this visit, we can be very brief here.

This corner of the CERN accelerator complex is called the antiproton decelerator because to make antimatter, you need to first slow down protons before you can trap them in a magnetic field. And then you can do very fundamental physics: high-precision spectroscopy of anti-hydrogen (spoiler: just the same as hydrogen), tests of CPT invariance, tests of gravity on antimatter, and much more.