ANL, Argonne, Illinois, USA
The most technically challenging module of the planned APS Upgrade (APS-U) project is the Focusing-Defocusing (FODO) module. The girder for the FODO must support a ~6m long string of three Q-bend and four quadrupole mag-nets. The challenges which emanate from retrofitting the existing APS tunnel with new hardware along with the stringent requirements for alignment and vibrational stability * necessitate a unique engineering solution for the magnet support system. FEA is heavily relied upon in order to create an optimized solution and reduce the number of design iterations required to meet specifications. The prototype FODO magnet support design is presented from the ground up, along with FEA justification and the expected vibrational performance of the module.
* Glenn Decker (2014) Design Study of an MBA Lattice for the Advanced Photon Source, Synchrotron Radiation News, 27:6, 13-17, DOI: 10.1080/08940886.2014.970932
ANL, Argonne, Illinois, USA
As part of the Advanced Photon Source Upgrade pro-ject (APS-U), the storage ring will be upgraded to a multibend achromat (MBA) lattice [1]. This upgrade will provide dramatically enhanced hard x-ray brightness and coherent flux to beamline experiments in comparison to the present machine. The accelerator physics require-ments for the upgrade impose very stringent alignment, assembly and installation tolerances and tight vibrational tolerances on the magnet support and alignment system designs. The short installation duration dictates a need for transporting groups of fully assembled magnet mod-ules into the storage ring enclosure while preserving magnet-to-magnet alignment. The current magnet sup-port and alignment systems preliminary design status for the APS-U storage ring will be presented along with an overview of the R&D program required to validate design performance. Magnet module transportation and installa-tion logistics will also be discussed.
* Glenn Decker (2014) Design Study of an MBA Lattice for the Advanced Photon Source, Synchrotron Radiation News, 27:6, 13-17, DOI: 10.1080/08940886.2014.970932
ANL, Argonne, Illinois, USA
The Advanced Photon Source Upgrade (APSU) is to replace the existing storage ring with a multi-bend achromats (MBA) accelerator lattice *. For the APS-U removal and installation, current planning calls for a 12-month shutdown and testing period, prior to resumption of operations. It calls for quick installation of the magnet support system with assembly and installation alignment tolerance. A three-point, semi-kinematic vertical mount for the magnet modules is the approach to reduce time for alignment. The longest section is the curved FODO section (four quads with three Q-bends interleaved, and a three-pole wiggler). All magnets of the FODO section sit on a single piece of support structure in order to have a good control over the magnet-to-magnet alignment tolerance. It brings challenge to minimize the top surface deflection and maximize the first mode frequency of the magnet support structure that is supported at three points. These constraints call for the need of optimizing the magnet support structures. Details of the optimization, including three-point positioning, material selection, and topology optimization, are reported in this study.
* Glenn Decker (2014) Design Study of an MBA Lattice for the Advanced Photon Source, Synchrotron Radiation News, 27:6, 13-17, DOI: 10.1080/08940886.2014.970932
ANL, Argonne, Illinois, USA
MAX IV Laboratory, Lund University, Lund, Sweden
MBA designs are placing stringent mechanical tolerances on the magnet support systems. At the APS-U the mag-net-to-magnet vibration tolerances are about 10 nm *. Timelines, installation requirements, and budgets constrain the resources available for prototyping and physical testing. Reliance on FEA to predict dynamic response is para-mount in insuring the tolerances are met. However, obtaining accurate results from a magnet support structure FEA is not as simple as analysing the CAD model of the structure. The 16th century author Nostradamus published a collection of prophecies that since his time, have been held up as predictions of various world events. While it is attractive to think his collection of short poems can be used to foretell the future, in reality it is only the vagueness and absence of any dates that make them easy to apply in a posthoc basis. Arguably, a similar statement can be made about the use of FEA in predicting accelerator support response. In this presentation the important contributors to FEA dynamic modelling will be discussed along with techniques that can be used to generate necessary data for models that can accurately predict response.
* APS-Upgrade, Functional Requirements Document, Advanced Photon Source, Argonne, IL, USA, APSU 1695659, May 2016.
