Wrong. There are multiple ways to contain antimatter dumbass.

If there weren't any way to do so PET scan machines couldn't work as they require a supply of positrons to do the imaging that they do. Positrons are anti protons.

The AF though has long since moved past needing to store them since they discovered a method of creating a beyond unity method of creating positrons on demand that causes a Cascade effect giving far more positrons than should be possible given the input power levels.

There's nothing particularly unsafe about this experiment especially given the extremely tiny amounts of antimatter I question.

It's amazing though how many people on here speak so authoritatively on subjects they obviously know fuckall about