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There are three routes to bypass this issue:

1. Move to supercritical Co2 turbines (lower mass —> lower cost), need RnD on corrosion resistant alloys

2. Move to thermoelectric or photovoltaic generators

3. Use aneutronic fusion

Directly use the charged particles

1. would have been done already if there were such alloys.

2. photovoltaic generators seem popular, but the don't require spending money on a fusion core.

3. The problem is hard, so let's replace it with a harder one?