Evaluation of a tiny 141 kg solar-thermal thruster that collects 104 kW of thermal power, focuses it onto a hafnium-carbide heat exchanger and uses it to produce 8.9 N of thrust at 927s Isp, meant as an upper stage to a smallsat launcher:
https://arc.aiaa.org/doi/10.2514/6.1994-3379
https://arc.aiaa.org/doi/10.2514/6.1994-3379
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