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Related to the first screenshot I posted. This is from a PDF from the AFRL Revolutionary Munitions presentation about anti-matter weapons in 2004 at NIAC done by Kenneth Edwards. He works for a man named Dr. Gerald Smith that was formerly at Penn State doing unmentionable things with antimatter, that operated a company called Positronics Research LLC.
>Search Kenneth Edwards NIAC for the whole thing
This presentation was not supposed to be released apparently. It made the news in 2004 with the story broken by the San Francisco Chronicle.
>Pic related "Positron Moderation" is the interesting part, specifically the tungsten moderator