These are two different problems - they can't solve the problem of creating a sustained fusion reaction, but they can still use a low-frequency pulsed drive for space travel - it's not necessarily that different from the Orion concept, just executed in a very different way.
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These are two different problems - they can't solve the problem of creating a sustained fusion reaction, but they can still use a low-frequency pulsed drive for space travel - it's not necessarily that different from the Orion concept, just executed in a very different way.