The Test Facility for Harmonic Generation at the MAX-lab Injector Linac

A test facility for harmonic generation is being built at MAX-lab. The third and fifth harmonic, at 90 and 53 nm respectively, will be created using a fs seed laser at 266 nm. The MAX-lab injector will be operated at 400+ MeV with a photo RF gun and the optics will be retuned to achieve compression. An optical klystron will be installed comprising of two undulators and a chicane. OVERVIEW AND SCOPE The BESSY FEL project [1] and the MAX IV proposal [2] are both focused on seeded FEL sources as part of the facilities. In the aim of improving the designs a decision was made to build a test facility for harmonic generation at MAX-lab. The MAX injector system [3] is a recirculated linac with energy capabilities up to 500 MeV. Few other locations have this linac energy available for a test facility. The joint effort includes simulations, a new electron source, laser systems, an optical klystron and experimental activities. The test facility is intended to use an electron beam of at least 400 MeV with an emittance of 3 μmRad and a bunch length around 500 fs. It will be injected into an optical klystron consisting of a modulator undulator, a chicane and a radiator undulator. A fs seed laser at 266 nm will be used and harmonic generation at 90 nm and later 53 nm will be studied.