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Stupakov, Threshold studies of the microwave instability in electron storage rings, Physical Review Special Topics - Accelerators and Beams, 2010","review_link":"https://doi.org/10.1103/PhysRevSTAB.13.104402","review_verified":"true","summary":"When a short electron bunch bends in a magnet, radiation from its tail catches up with its head and pushes on it, which can blur the beam or break it into tiny density ripples. Predicting these self-forces in three dimensions, and using them to make light on purpose, are open.","title":"Coherent synchrotron radiation and microbunching in bends","topic_ref":null,"why":"These self-forces limit how short and bright bunches can be made for x-ray FELs and low-emittance storage 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