Which mechanism causes helium accumulation within a fusion reactor's plasma as deuterium-tritium fuel is consumed?

💡 Explanation

Helium accumulates due to alpha particle production; the deuterium and tritium nuclei fuse, undergoing nuclear fusion. These then result in helium nuclei (alpha particles) and neutrons as reaction products, because the fusion results primarily in helium, therefore, the alpha particles increase rather than moderating neutrons.

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