[mlindner]

Has there been research on more efficient ways to generate antiprotons? (By the way anti-hydrogen isn't how you would store it as anti-hydrogen can't be trapped.)

[fsh]

Anti-hydrogen is routinely trapped in magnetic traps at CERN.

[kadoban]

If anyone is curious how, I think this is vaguely the idea: https://alpha.web.cern.ch/science/2-trapping-antihydrogen

tl;dr: strong magnetic fields in a certain configuration since in a strong enough field anti-hydrogen acts like little bar magnets.