FELBE -Upgrades and Status of the IRlTHz FEL User Facility at HZDR

The FELBE User Facility at the ELBE Center for High Power Radiation Sources offers two FELs dedicated to optical studies of materials over a wide range of the THz and IR spectrum. In 2017, the installation and commissioning of a new U37 undulator was completed, resulting in enhanced performance over the spectral range of 7.5 – 60 THz (5 – 40 um), Operation of the new FEL for User operation began during the 2 nd half of 2017. Results of the commissioning and early User runs are reported here.