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When you're done with it can I borrow your particle collider capable of mass synthesis of helium

Alpha particles are essentially Helium, so by breeding large amounts of highly active alpha emitters you can produce Helium much more effectively than by fusion.

Probably that's what they did at the rocky exoplanet. How much radiation do they need down there for it to be measurable as helium in the atmosphere?

The proper way to generate helium is to use a deuterium-tritium fusion reactor.

Given the neutron radiation from a fusion reactor, it's possible to synthesize Helium (He4) and more Tritium (T) and 3He using Lithium-6 with Boron-10 and Boron-11. An adjacent vertically-aligned (VA-CNT) battery would last for like 20 years and could power safety systems.

A Deuterated Vitrimer pipe with Li-6, B-10, and B-11 could be recycled to extract the T, 3He, and 4He.

Deuterated Vitrimers could also be disposed of in a waste burner.

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