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Comment on Antimatter Propulsion [pdf]

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This is absolutely fascinating, though this isn't my field. Are any of the concepts presented feasible? Is mass-production of antiprotons on Earth realistic?

In the sense that we can currently produce and store some millions of antiprotons at a time, using a proton accelerator "merely" around 200m in diameter. Not in the sense that it would be anywhere near feasible to produce and store even a microgram worth of antimatter.

store some millions of antiprotons at a time

I agree, but for scale I want to add that a glass of water has like 1000000000000000000 millions of protons in it.

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