Low-efficiency fusion propulsion?

I'm working on a fusion rocket concept for a hard science fiction setting. I'm envisioning laser catalyzed Proton-Boron reactors (low waste heat, aneutronic, 100% of their output being He4 Alpha particles) based on HB11 or TAE's designs, but with two major drawbacks:

1) They must convert almost all of their particle output into electricity in order to break even, leaving only a small amount that can be used for thrust

2) The lasers themselves need to be replaced or refurbished after a few hours of use.

So when all's said and done, the engine performs more like a nuclear thermal rocket than a torch ship or an Epstein drive. Stylistically and tech wise, 'fusion but it's not that good' would fit my setting like a glove.

Plausible concept or dumb idea?

posted over 5 years ago

Jake‭

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