I came across this in IEEE Spectrum
https://spectrum.ieee.org/euv-fel
Phil Hobbs got the ASML tin-droplet EUV light source to work, but there
now seems to be the prospect of better way to do it, with undulators
acting on high energy electron beam as the EUV source.
It has always been a fairly obvious idea, but - as the Spectrum article
makes clear - it's not easy to get enough EUV light out.
--
Bill Sloman, Sydney
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