One way to do this is to use magnetic fields. You can contain charged particles (plasma) in a "magnetic bottle" by surrounding them with a strong magnetic field. Since anti-protons and positrons are also charged particles, you could contain them in a "magnetic bottle" as well. The antimatter would never have a chance to interact with matter that way. Another possible method is to use powerful lasers, shining from all directions, to contain the antimatter.
Some antiparticles, like positrons, have an electric charge, so like ordinary matter, they feel forces when in electric and magnetic fields. Using an appropriate arrangement of these fields, scientists can keep antimatter contained in a region of space, away from matter.
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