Abstract

The Paul Scherrer Institute (PSI) in Switzerland is planning to build a cost‐effective X‐ray Free Electron Laser (XFEL) facility for 0.1–10 nm wavelength and 10–100 fsec pulse length, requiring only 6 GeV electron energy. The facility will consist of a Low Emittance electron Gun (LEG) with high gradient acceleration and advanced accelerator technology for preserving the emittance during acceleration and bunch compression. To demonstrate feasibility of the project, a 4 MeV test stand followed by a new 250 MeV test stand will be used at PSI. An emittance of 200 pC, with >700 keV energy and >125 MV/m gradient.

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