Bonn 2010 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 82: Beschleunigerphysik V

T 82.1: Gruppenbericht

Freitag, 19. März 2010, 14:00–14:20, HG ÜR 4

FLASH - the Free-Electron Laser User Facility at DESY — •Siegfried Schreiber1, J. Feldhaus1, K. Honkavaara1, B. Faatz1, R. Treusch1, and J. Rossbach1,21DESY, Hamburg — 2Universität Hamburg

The free-electron laser facility FLASH at DESY, Germany finished its second user period scheduled from November 2007 to August 2009. More than 300 days have been devoted for user operation, a large part of beamtime has been allocated for machine studies for further developments, including beamtime for XFEL and ILC R&D. FLASH provided trains of fully coherent 10 to 50 femtosecond long laser pulses in the wavelength range from 40 nm to 6.8 nm. The SASE radiation contained also higher harmonics; several experiments have successfully used the third and fifth harmonics. The smallest wavelength used was 1.59 nm.

In the last few months, FLASH has been substantially upgraded. A 7th superconducting accelerating module is installed to increase the beam energy to 1.2 GeV. Among many other upgrades, four 3rd harmonic superconducting RF cavities are installed in the injector. The main purpose is to flatten and - to a certain extend - to shape the longitudinal electron beam phase space improving the dynamics behavior of the beam. A seeding experiment sFLASH has been installed as well, an important step forward to establish seeded FEL radiation for user experiments. After the ongoing commissioning, the 3rd user period will start this summer. In many aspects FLASH will be an FEL with a new quality of performance: a wavelength approaching the carbon edge and the water window, tunable pulse width, and with thousands of pulses per second.

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