A gyrotron uses high-power, linear-beam vacuum tubes to generate millimeter-length electromagnetic waves. Invented by Soviet scientists in the 1960s, gyrotrons are used in nuclear fusion research experiments to heat and control plasma. Quaise has raised $95 million from investors, including Japan’s Mitsubishi, to develop technology that would enable it to quickly and efficiently drill up to 20 km deep, closer to the Earth’s core than ever before
Fusion power tech adapted to ease geothermal power. IMO a good example of remixing knowledge from one domain to another. And, for example, if you think fusion isn't worth pursuing, then we might not get this cross-cutting adaptation that's valuable for advancing renewable energy.