Antimatter Injection was obviously injecting antimatter into matter to create power. This was the simplest method to create an antimatter reactor.
Paul Dirac first proposed the existence of antimatter in 1928. He was not confirmed until 1932 when physicist Carl David Anderson discovered the positron, the antimatter equivalent of the electron. Then, in the 1950s, the antiproton and the antineutron were discovered. This was followed by the discovery of antinuclei in 1965. The path to antiatoms was opened. In 1995, antihydrogen was discovered. This was followed in 2011 by the discovery of antihelium. However, antimatter was expensive. But in the early-to-mid-21st century, advances in technology allowed antimatter power stations to be built for the first time.
Tech Level: 12
Antimatter injection was the simplest method of antimatter power in use. In this process, antiprotons were injected into a working medium like liquid hydrogen. Enough antiprotons could turn the liquid into a gas. This would turn turbines to produce electricity. If there enough antimatter, the liquid could become a plasma. This was useful for space propulsion like in the science fiction franchise Star Trek. Antimatter was still expensive, so antimatter injection was used only in certain applications. One of these was in space. Even so, there was an even bigger problem. Antimatter could not be contained in a conventional container. The solution was advanced antimatter traps.