Stuttgart 2012 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 14: Interaction with VUV and X-ray light II

A 14.6: Vortrag

Dienstag, 13. März 2012, 11:45–12:00, V57.05

Gas-Based Photoemission Spectrometer for Online Shot-to-Shot Photon Beam Diagnostics at the European XFEL — •Jens Buck, Jan Grünert, Cigdem Ozkan, Bin Li, Wolfgang Freund, and Serguei Molodtsov — European XFEL GmbH, Albert-Einstein-Ring 19, 22761 Hamburg, Germany

At free-electron laser facilities, non-invasive beam diagnostics on the basis of photoionization of rare gases has found broad applications in the past and is also under development at the future European X-ray Free Electron Laser (XFEL.EU) facility [1,2]. The Self-Amplified Spontaneous Emission (SASE) process utilized here is known to produce pulses with significant statistical variations of essential pulse properties such as energy, spectrum, temporal profile etc. Single-pulse resolved diagnostics data is therefore required as an essential reference for user experiments. The specifications of XFEL.EU, especially the high intra-bunch repetition rate of 4.5 MHz and the vast energy range between 280 eV and 25 keV pose particular challenges for the design of gas-based devices.

We report on our conceptual design [3] and our recent developments of a photoelectron time-of-flight spectrometer for spectroscopy of single SASE pulses and give a first assessment of the expected performance of the device as derived from detailed simulations in a realistic environment and first commissioning experiments with synchrotron radiation.

[1] M. Altarelli et. al.,The European XFEL Technical Design Report (2006). [2] J. Grünert, Proc. FEL09, Liverpool (2009). [3] J. Buck, Conceptual Design Report: Photoemission Spectrometer, in prep.