IIRC, Eric was talking about Hz on the order of 1500+ or so initially, with 25MW output — limited by cooling efficiency, not anode length. Electrode cooling with a micron-thick layer should be fairly trivial to engineer, IMO. The coating can be made of just about any molecule/material that can be structured into a ‘forest’ of vertical chains, so X-ray transparency should also be easy enough to manage. And every bit of recovered heat adds to the ‘profit’, so I am sure Q can be hugely increased.
