CERN lab
See what cannot be seen
A particle detector is a layered camera: every particle leaves a different signature in it. And a Penning trap can store antimatter that must not touch anything material. Try both instruments.
What does the detector see?
Pick a particle and watch its track in the detector cross-section. The layers where it deposits energy light up.
An electron leaves a curved track in the tracker (it is charged) and then dies entirely in the electromagnetic calorimeter, dumping its energy as a shower.
A Penning antimatter trap
An antiproton must not touch the wall, because it annihilates. Fields hold it instead: the magnetic one curls its path into tight circles, the electric one closes it along the axis. Switch the field off and see what happens.
This is exactly how CERN stores antiprotons and antihydrogen: in vacuum, in fields, with no contact with matter. Antihydrogen trapping records are counted in hours.