Paper | Title | Page |
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TUPSO85 | High Brightness Electron Beams from a Multi-filamentary Niobium-tin Photocathode | 431 |
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High-brightness electron sources are of fundamental interest for modern FELs. Inspired by the micro-structure of field emitter arrays, we propose a new type of metallic photo-cathode consisting of thousands of Nb3Sn micro-columns. With this metallic photo-cathode quantum efficiencies up to 0.5% are achieved under stable operation, and preliminary emittance measurements are presented. | ||