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A device that uses a focused stream of high-energy particles—electrons, protons, or ions—to initiate reactions at the molecular or atomic level. Unlike laser igniters that heat from the outside, particle beam igniters can deposit energy deep within a material, triggering reactions from the inside out. This makes them ideal for igniting dense fuels, initiating nuclear reactions, or, if you're a supervillain, starting chain reactions in things you'd rather weren't chain-reacting. Particle beam igniters are mostly theoretical for everyday applications, but they're essential in fusion research, where you need to deposit energy precisely in a tiny pellet of fuel to make it implode and fuse.
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