Lindau, F.

Paper	Title	Page
TUPPH006	Diagnostic Tools for the Undulator System of the Seeded HGHG-FEL at MAX-lab	243
	J. Bahrdt, M. Abo-Bakr, W. Frentrup, A. Gaupp, K. Holldack, M. Scheer BESSY GmbH, Berlin S. K. Hoffgen, J. Kuhnhenn, U. Weinand FhG, Euskirchen F. Lindau, S. Thorin, S. Werin MAX-lab, Lund
	Within the EUROFEL Design Study a one stage seeded HGHG FEL has been set up at the MAX-lab injection linac. BESSY has built the undulator system consisting of a modulator, a radiator and an electromagnetic chicane. BESSY also provided various diagnostic tools including Cherenkov glass fibres, powermeter glass fibres and THz detectors. After installation the undulators have been measured in the final position with a pulsed wire and residual field integrals have been compensated with air coils. During first injections with the laser driven rf-gun the Cherenkov system has delivered detailed spatial information on the losses of electrons within the beamline. The powermeter system which provides information on absolute doses deposited in the permanent magnets has collected data over half a year and the high sensitivity and low drift of the system has been demonstrated. Two types of THz detectors have been used close to the electron beam dump giving information on the electron bunch compression and on the seed laser induced beam energy modulation. We will report on the measurements taken with the diagnostic tools mentioned above.
FRAAU06	Commissioning of the Test FEL at MAX-lab	556
	S. Werin, F. Curbis, N. Cutic, F. Lindau, S. Thorin MAX-lab, Lund M. Abo-Bakr, J. Bahrdt, K. Holldack BESSY GmbH, Berlin
	An installation for testing techniques related to seeding and harmonic generation has been completed at MAX-lab. The aim is to study the processes around seeded harmonic generation at 130/88/54 nm, the 2/3/5 harmonic of a Ti:Sapphire laser. During the spring 2008 the commissioning work has begun and this paper will report on the progress. The test FEL is built around the existing linac injector at MAX-lab. This source can provide 4-500 MeV electrons from an RF-gun. A combined laser system both driving the photo cathode in the gun and, synchronised via an optical fibre, the seed laser pulse has been put into operation. An optical klystron, consisting of two 30 period undulators and a 4-magnet chicane, is in operation. Beam loss monitors along the optical klystron are in use and a THz system for additional synchronisation studies under installation. Results from electron beam optics and operation generating spontaneous radiation is already available and synchronisation results immediate. The work is in progress and new results are added continuously to the portfolio.
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