Extreme conditions research using the large-volume press at the P61B endstation, PETRA III

Abstract

Penetrating, high-energy synchrotron X-rays are in strong demand, particularly for high-pressure research in physics, chemistry and geosciences, and for materials engineering research under less extreme conditions. A new high-energy wiggler beamline P61 has been constructed to meet this need at PETRA III in Hamburg, Germany. The first part of the paper offers an overview of the beamline front-end components and beam characteristics. The second part describes the performance of the instrumentation and the latest developments at the P61B endstation. Particular attention is given to the unprecedented high-energy photon flux delivered by the ten wigglers of the PETRA III storage ring and the challenges faced in harnessing this amount of flux and heat load in the beam. Furthermore, the distinctiveness of the world's first six-ram Hall-type large-volume press, Aster-15, at a synchrotron facility is described for research with synchrotron X-rays. Additionally, detection schemes, experimental strategies and preliminary data acquired using energy-dispersive X-ray diffraction and radiography techniques are presented.

Metastable CrMnNi steels processed by laser powder bed fusion: experimental assessment of elementary mechanisms contributing to microstructure, properties and residual stress

“…The residual stress depth profiles, shown in Fig. 2 , were determined by energy dispersive synchrotron diffraction (ED-XRD) in reflection mode in accordance to 43 , 44 . Data are plotted for the fcc phase.…”

The Microbeam Insert at the White Beam Beamline P61A at the Synchrotron PETRA III/DESY: A New Tool for High Dose Rate Irradiation Research

“…The beamline P61 is the first polychromatic beamline at the synchrotron PETRA III on the DESY campus in Hamburg. The frontend components have been described in detail already [ 30 ]. A schematic of the beamline components is shown in Figure 1 a.…”

“…The large flux produced by the insertion devices at P61A has, as a consequence, large dose rates and high-power density of the X-ray beam incident on the sample. An integrated power density of 20 W/mm 2 at the sample position in the experimental hutch is available in the central cone of the beam [ 30 ]. Several components are installed along the beamline to handle this power load and protect downstream instruments.…”

“…The frontend of the P61 beamline serves two end stations. End station P61B, containing a large-volume multi-anvil press, was described in detail by Farla [ 30 ]. The end station P61A is operated by the Helmholtz Centre HEREON (formerly Helmholtz Centre Geesthacht) and has been designed for material sciences research.…”

“…As part of the dosimetric characterization, radiation transport simulations were carried out using the Monte Carlo code Geant4 (Version 10.5.1) [ 37 ]. For the purpose of this study, we assumed that the photon spectrum corresponds to the one simulated by Farla et al [ 30 ]. In addition, we simulated a non-divergent beam with a rectangular shape of (2.4 × 1.2) mm 2 , as obtained from beam-profile measurements.…”