FEL DIAGNOSTICS AND USER CONTROL

The most recent upgrades and improvements to the free-electron laser ( FEL) facility FELIX are presented. Special attention is paid to the im proved beam-handling and diagnostic station. In this evacuated beam st ation a device is implemented that is capable of selecting single micr opulses with measured efficiencies of more than 50% over the whole wav elength range of FELIX (5-110 mu m). Furthermore, the broadband autoco rrelator for micropulse length measurements and the planned continuous polarization rotator based on reflective optics are discussed. Recent additions to the ancillary equipment available to FEL users are prese nted briefly. The most important ones are the mirror-dispersion-contro lled 10-fs Ti:sapphire laser and the 40-T magnet. (C) 1998 Elsevier Sc ience B.V. All rights reserved.