Jolly Roger wrote:

…how many useful things could be investigated without using a DPF at all?

My vision of the future my grandchildren will live in includes fusion-powered planes, trains, trucks and ships. 5 MW (and multiples thereof) would have applications in transportation, an energy-intensive sector of the world economy. Reduction in size and weight of auxilliary systems (ie capacitors, switches, shielding, etc.) would be needed. Research and Development in those areas would be useful.

P.S. It’s been a while since I last posted.
I know Elon Musk, of TeslaMotors and SpaceX, has a “next big project” in the back of his mind — electric planes with 12,000-mi range. FF could do that for him.