B. List, L. Hagge, M. Hüning, D. Miller, P.-O. Petersen
DESY, Hamburg, Germany
The PETRA-IV next-generation synchrotron radiation source planned at DESY is currently in preparation as successor of PETRA-III, with a completely new accelerator and a new experimental hall, while existing buildings, tunnels and experimental beamlines will be retained where possible. The Technical Design Report is due to be completed by the end of 2022. A CAD integration model has been set up for the complete accelerator and photon science complex. It combines the contributions of all relevant trades, the accelerator components, supply infrastructure, installations, frames, tunnels and buildings, and the design of the campus. The CAD model structure is aligned with the project’s part breakdown structure (PBS) and the Work Breakdown Structure (WBS) to facilitate integration with systems engineering and reflect responsibility within the project organization. Within the model, it is possible to switch between different levels of detail for space allocation (DG1 - "black box"), interface definition (DG2 - "grey box") and detailed design (DG3 - "white box"), separating layout from design, while ensuring their consistency. Placement of accelerator components is directly governed by the lattice through direct access to spreadsheet data, allowing fast design changes after a lattice update and ensuring consistency between mechanical and lattice design. The resulting model will support the complete facility lifecycle, from layout and design to fabrication, installation and operation. The presentation explains the tasks and requirements of the CAD integration process and uses examples to explain the structure and the modeling methodology of the CAD integration model.
J.L. Giorgetta, A. Lestrade, A. Mary, K. Tavakoli
SOLEIL, Gif-sur-Yvette, France
The current girder set of SOLEIL features 4 girder types weighing from 1.85 t to 3 t, with a respective mass payload varying from 4.1 t to 8 t and lengths from 2.40 m to 4.80 m. The smaller size of magnets used for the present version of the SOLEIL upgrade allows a dramatic size and weight reduction of the magnet-girder assemblies. On the other hand, the number of magnets and girders has increased by a factor of 3, implying longer alignment and installation operations. Another constraint is due to the high compactness of the new lattice causing some limitations and access restrictions in the area between girders and tunnel wall. Several setups involving a number of girders from 116 to 212, various magnet layouts and binding systems have been studied. Dynamic and thermal performances have been evaluated by FEA analysis. This approach gives to accelerator physicists the performance of each solution, and thus a great versatility in the choice of the best setup in terms of dynamic and thermal stability. Alignment constraints, installation schedule reducing "dark time" period and economic considerations have also been taken into account during all the design phase.
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Funding:Work supported by the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Silicon crystals have been widely applied for x-ray monochromators. It is an anisotropic material with temperature dependent properties. Values of its thermal properties from cryogenic to high temperature are available in literature for expansion, conductivity, diffusivity, heat capacity, but neither elastic constants nor Young’s modulus. X-ray monochromators may be liquid-nitrogen cooled or water cooled. Finite Element Analysis (FEA) is commonly used to predict thermal performance of monochromators. The elastic constants and Young’s modulus over cryogenic and high temperature are now collected and derived from literature, with the purpose of assisting in providing accurate FEA predictions.
K.J. Wakefield, S.J. Bean, D. Capatina, E.M. Dufresne, M.V. Fisher, M.J. Highland, S. Narayanan, A. Sandy, R. Ziegler
ANL, Lemont, Illinois, USA
Funding:Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357. The X-ray Photon Correlation Spectroscopy (XPCS) beamline at the Advanced Photon Source (APS) has been selected as one of the nine feature beamlines being de-signed to take advantage of the increase in coherent flux provided by the APS Upgrade. The 8-ID-E enclosure at the beamline will have a dedicated instrument for per-forming Wide Angle XPCS (WA-XPCS) measurements across a range of length and time scales. The instrument will feature a high-stability 6-circle diffractometer, a moveable Long Distance Detector Positioner (LDDP) for positioning a large pixel array detector, and a removable flight path assembly. For intermediate sample to detector distances of 1.5 to 2 meters, a large pixel array detector will be positioned on the diffractometer detector arm. For longer sample to detector distances up to 4 meters, an horizontal scattering geometry will be utilized based on the LDDP to position a second large pixel array detector. The LDDP will consist of a large granite base on which sits a combination of motorized stages. The base will sit on air casters that allow the LDDP to be coarsely posi-tioned manually within the enclosure. Final positioning of the detector will be achieved with the mounted stages. The spatial relationship between the sample and the free moving LDDP will be monitored using a laser tracking system. A moveable flight path will be supported by the diffractometer arm and a mobile floor support to mini-mize air scattering while using the LDDP. The WA-XPCS instrument has been designed with users and beamline staff in mind and will allow them to efficiently utilize the highly enhanced coherent beam provided by the APS Upgrade.
