Well, think about it. In fusion and fission, you're only converting a tiny tiny fraction of the atoms' masses to energy. And then to make antimatter, you want to reconstitute this tiny fraction as entire particles.
IANAP (I Am Not A Physicist) but it seems like the only "realistic" way to create lightspeed-propulsion quantities of antimatter might be to convert entire planetoids and planets to iron.
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Well, think about it. In fusion and fission, you're only converting a tiny tiny fraction of the atoms' masses to energy. And then to make antimatter, you want to reconstitute this tiny fraction as entire particles.
IANAP (I Am Not A Physicist) but it seems like the only "realistic" way to create lightspeed-propulsion quantities of antimatter might be to convert entire planetoids and planets to iron.