The PolFEL free electron laser, currently under construction at the National Centre for Nuclear Research in Poland, will generate a beam of coherent electromagnetic radiation in the ultraviolet (UV) spectral range with a wavelength of about 150 nm to 300 nm, in the form of several hundred fs pulses, energy up to 50 μJ, and repetition rate of 50 kHz. Vacuum ultraviolet (VUV) radiation beam in the wavelength range from 50 nm to 100 nm will be obtained by selecting the third harmonic using an absorption filter. The optical system of the UV/VUV beamline consists of two plane M1 and M2 mirrors and one focusing ellipsoidal M3 mirror. The radiation produced in the laser hits on the M1 mirror at a grazing incidence angle of 5°. After reflection from the M1 mirror, the beam falls on the M2 mirror at an angle of 17°, which directs the beam to the ellipsoidal M3 mirror, focusing the beam at the image plane at the second focal point of the ellipsoid. The M1 mirror is placed behind the 3 m-thick concrete wall in a hutch separated from the experimental hall by a 1.6 m-thick concrete wall. The optical properties of the beamline were tested by ray-tracing simulations using the RAY-UI software, the results of which are presented in the paper.
The Polish Free Electron Laser, PolFEL was proposed more than decade ago and at that time was accepted for the Polish Roadmap for Research Infrastructures. The facility was proposed to be built in two stages, at first, with fewer accelerating sections and lower beam energy and the second one, with more accelerating sections, delivering 600 MeV electrons to VUV undulator, generating in the Self Amplified Spontaneous Emission process coherent radiation at wavelength ranged down to 27 nm and 9 nm in the first and third harmonic mode, respectively. Over past decade new experimental methods have been proposed and developed, delivering interesting results obtained with relatively low energy coherent and non-coherent photon beams, for example with IR-UV and THz radiation. In this contribution, subsystems of an updated version of the first stage PolFEL facility will be discussed. The project has recently received funds from the Smart Growth Operational Programme, Measure 4.2: Development of modern research infrastructure of the science sector, and is currently in a preparation phase of the construction, which will begin in 2019.
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