Radiation shielding for the HED science instrument at the European XFEL

Tschentscher, Thomas

Conference Presentation (After Call)

PUBDB-2015-04995

Radiation shielding for the HED science instrument at the European XFEL

Tschentscher, T. (Corresponding author)>Extern*XFEL*

2015

Eighth International Workshop on Radiation Safety at Synchrotron Radiation Sources, RadSynch15, Hamburg, Eur.XFEL, Germany, 3 Jun 2015 - 5 Jun 2015

Abstract: The High Energy Density Science (HED) instrument at the European X-ray Free-Electron Laser Facility in Hamburg, Germany, is dedicated to the investigation of a wide range of materials and systems at extreme conditions of pressure, temperature, ionization or electro-magnetic field leading often to non-reversible states of the probed material. For sample excitation a variety of high energy drivers will be installed at this instrument [1]. In particular, a 100 TW-class optical laser shall provide 30 femtosecond long and 3 J intense pulses on the sample. Focussing such an optical laser pulse intensities beyond 1E18 W/cm2 can be obtained, allowing to generate relativistic electrons inside the sample volume. These electrons generate hard x-ray Bremsstrahlung radiation at an intensity level requiring appropriate shielding of the experiment room. A particular boundary condition here is the anticipated high repetition rate of pulse delivery of up to 10 Hz. For the HED instrument the shielding requirement resulting from this secondary source exceeds by far the shielding requirement related to the x-ray FEL radiation and spontaneous radiation provided by the electron accelerator. This specific requirement has led to the decision to design the shielding of the HED experiment using heavy concrete walls, in contrast to all other experiment areas at European XFEL. In the presentation on overview of the radiation simulations, performed all at HZDR, will be given and the HED instrument design will be introduced.References[1] M. Nakatsutsumi, K. Appel, G. Priebe, I. Thorpe, A. Pelka, B. Muller, Th.Tschentscher, Technical design report: Scientific instrument High Energy Density Physics (HED), XFEL:EU TR-2014-001, Germany, 196 p (2014),doi:10.3204/XFEL.EU/TR-2014-001.

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