Would require a military grade klystron to generate 10+kW of S-band energy, for starters. In a vacuum setting, I'm not sure how you'll sink all the resulting he

Would require a military grade klystron to generate 10+kW of S-band energy, for starters. In a vacuum setting, I'm not sure how you'll sink all the resulting heat to avoid melting the thing. I think even then it's very challenging to measure ~100mN thrust