FEL operating principle - FELIX Laboratory
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EuPRAXIA - FEL
Free Electron Lasers
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following an electron bunch for free electron laser - YouTube
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![PDF] Zone Plates for Hard X-Ray Free-Electron Lasers | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/f0c7c2d3e962c141ad57e80cdf9a6c2452f9c4f8/20-Figure2.1-1.png "PDF] Zone Plates for Hard X-Ray Free-Electron Lasers | Semantic Scholar")