Long-term autonomous storage of antimatter: US7709819B2

US7709819B2 – Apparatus for the long-term storage and handling of antimatter

Long-term antimatter storing device powered by a magnetron with low power and able to function independently for hundreds of years on batteries. A cryogenic, evacuated container has a source each of electrons and positrons placed in capture relationship to one another. This allows for the formation a number of positronium molecules. Within the container, a microwave resonator creates a circularly-polarized standing waves within which the positronium atoms can rotate. For small stores, radioactive sources and low-energy positron accelerations are used. The device is filled with positronium within seconds or minutes. The device can also be configured to allow for positron extraction. Also provided is a method of storing antimatter.

Source:
https://patents.google.com/patent/US7709819B2/en