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http://autonoma.ca/calculators/rocket/antimatter/

Given a distance, an allowable time to reach that distance, a payload to send, and an expected exhaust velocity, how would you calculate the time required to convert energy into antimatter fuel and how much antimatter needed to arrive at the destination (starting from the Moon)?

There are a few side calculations, such as the size of the radiator, estimated footprint of the fusion reactor itself, and how much metamaterial is needed. This is to help figure out timelines for a sci-fi novel, so ballpark answers are completely fine.

The calculations yield what appear to be values around the correct order of magnitude. Would be delighted to have insights, comments, and corrections.



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