A single-pass high-gain x-ray free electron laser (FEL) calls for a high quality electron bunch. In particular. for a seeded FEL amplifier and for a harmonic generation FEL. the electron bunch initial energy profile uniformity is crucial for generating an FEL with a narrow bandwidth. https://www.bekindtopets.com/flash-pick-Ovation-Toddler-Metallic-Schooler-Helmet-XXSmall-XSmall-hot-choice/
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