van der Meer, A. F.G.

Paper	Title	Page
TUAAU05	Design of the Nijmegen High-Resolution THz-FEL	200
	R. T. Jongma Radboud University Nijmegen, Institute of Molecules and Materials, Nijmegen K. Dunkel, C. Piel ACCEL, Bergisch Gladbach U. Lehnert, P. Michel, R. Wuensch FZD, Dresden C. A.J. van der Geer Pulsar Physics, Eindhoven A. F.G. van der Meer FOM Rijnhuizen, Nieuwegein P. J.M. van der Slot Twente University, Laser Physics and Non-Linear Optics Group, Enschede W. J. van der Zande Institute for Molecules and Materials, Radboud University Nijmegen, Nijmegen
	In 2006, the Radboud University in Nijmegen received funding via the Netherlands NWO-BIG program to realize a THz laser system and a 45 T hybrid magnet system. The specifications of the THz FEL system are geared towards material science at high (30-45 T) magnetic fields (saturation spectroscopy and pulse-echo experiments), and applications e.g. in the field of biomolecular spectroscopy. A study performed during the last year demonstrated the feasibility of a THz FEL that will cover the 100-1500 micron spectral range and that operates in either a “spectroscopic mode” providing 100 Watt bandwidth limited pulses of several microsecond (spectral resolution better than 100000/1) or pump-probe pulsed mode providing macropulses with 3 GHz. micropulses. Technical challenges are in the 3 GHz operation of the source, and the narrowband operation. The latter will be obtained by filtering a single mode out of the frequency comb, realized by ensuring full coherence between the micropulses. Coherence is imposed by the stability of the electron beamμpulses (“spontaneous” coherence) or by the use of an intra-cavity (Fox-Smith) interferometer. We will present details of the chosen design.
	Slides
TUPPH076	Electro-optic Techniques for Longitudinal Electron Bunch Diagnostics	413
	G. Berden, A. F.G. van der Meer FOM Rijnhuizen, Nieuwegein W. A. Gillespie, P. J. Phillips University of Dundee, Nethergate, Dundee, Scotland S. P. Jamison STFC/DL/ASTeC, Daresbury, Warrington, Cheshire A. MacLeod UAD, Dundee B. Schmidt, P. Schmüser, B. Steffen DESY, Hamburg
	Electro-optic (EO) techniques are becoming increasingly important in ultrafast electron bunch longitudinal diagnostics and have been successfully implemented at various accelerator laboratories. The longitudinal bunch shape is directly obtained from a single-shot, non-intrusive, measurement of the temporal electric field profile of the bunch. Furthermore, the same EO techniques are used to measure the temporal profile of terahertz / far-infrared optical pulses generated by a CTR screen, at a bending magnet (CSR) or by an FEL. This contribution summarizes the results obtained at FELIX and FLASH.