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Instruments / Technical Area	Publication Details	Published
Optics	A CAD tool for linear optics design: A use case approach J. Bengtsson , W. Rogers , T. Nicholls IPAC2021 - 12th International Particle Accelerator Conference DOI: 10.18429/JACoW-IPAC2021-MOPAB047 Open Access Show Abstract ▼ Abstract: The formula relevant for linear optics design of synchrotrons are derived systematically from first principles, i.e., an exercise in Hamiltonian dynamics. Equipped with these, the relevant use cases are then captured; for a streamlined approach. To enable professionals, i.e., software engineers, to efficiently prototype & architect a CAD tool available to mechanical engineers since the mid-1960s. In other words, robust design of a modern synchrotron is an exercise in/pursuit of the art of Engineering-Science.	Aug 2021
Optics	Exploratory lattice design studies for Diamond-II B. Singh , R. Bartolini , J. Bengtsson , H. Ghasem , I. P. S. Martin IPAC2019 DOI: 10.18429/JACoW-IPAC2019-TUPGW079 Open Access Show Abstract ▼ Abstract: We pursue Robust Design of a Ring-Based Synchrotron Light Source as a System. In particular, the Design Philosophy is based on: ’ To Control the Nonlinear Dynamics: Control the Linear Optics. In particular, by: ’ Optimal Control of Natural Chromaticity. ’ ’-I Transformer’ between Chromatic Sextupoles for Unit Cell. ’ Higher-Order-Achromat for Super Period. In addition, by pushing the Requirements for Robust & Efficient Injection ’Upstream’, i.e., by considering On-Axis Injection, and by utilizing Reverse Bends (to trans-cend the reductionist Theoretical Minimum Emittance Cell), either: ’ the Natural Emittance can be reduced further, ’ or the Touschek Lifetime can be improved. Bottom line, a Design Choice.	Jun 2019
Accelerator Physics	Towards a diffraction limited storage ring J. Bengtsson , P. F. Tavares International Particle Accelerator Conference (10th) DOI: 10.18429/JACoW-IPAC2019-TUPGW075 Open Access Show Abstract ▼ Abstract: A Lattice for a 500 m circ. Tunnel, based on First Principles & Best Practices is presented. Background: MAX-IV has made a "quantum leap" towards a Diffraction Limited Storage Ring (DLSR) by an Engineering-Science, i.e., Systems, Approach; leading to a Paradigm Shift(s): e.g. the Magnet Reference Radius is a Key Parameter, a Design Choice, that must be considered at an early stage for Robust Design. In addition, the pursuit of Systematic Benchmarks, MAX-I -> MAX-IV, has enabled the pursuit of Disruptive Technologies with Predictable Results. For example: Combined-Function Magnets (built-to-print) enabling an "IKEA Approach" (innovative, prompted by low-budget) like the use of Concrete Girders, Vacuum Requirements mitigated by NEG Coating, and Solid State Modulators providing a Reliable Injector by a Full-Energy Linac. Since "The Experiment" now has been done, Permanent Magnets, well understood for high-end Insertion Devices, provides another opportunity/step for a Next Generation. Besides, the Electricity Bill for Conventional Magnets is a significant part of the Operations Cost.	Jun 2019
Magnets	Lattice options for DIAMOND-II B. Singh , R. Bartolini , J. Bengtsson , H. Ghasem , A. Streun 9th International Particle Accelerator Conference DOI: 10.18429/JACoW-IPAC2018-THPMF009 Open Access Show Abstract ▼ Abstract: Generalized MBA (Multi-Bend-Achromat) Chasman-Green type lattices, with a low-dispersion mid-straight, have been studied and refined by pursuing a generalized Higher Order Achromat to control the non-linear dynamics to obtain a robust design. New candidate lattice have been produced aiming for a horizontal emittance of 150 pm×rad for off-axis injection and 75 pm×rad for on-axis, the latter making use of reverse bends. The results of these studies and evaluations have been summarized in this paper.	Jun 2018
Controls Magnets Optics	Control of the nonlinear dynamics for medium energy synchrotron light sources J. Bengtsson , R. Bartolini , H. Ghasem , B. Singh , A. Streun 9th International Particle Accelerator Conference DOI: 10.18429/JACoW-IPAC2018-THPMF006 Open Access Show Abstract ▼ Abstract: MAX-IV has introduced a paradigm shift in the design philosophy for the "Engineering-Science" in the quest for a diffraction limited Synchrotron Light Source. Similarly, SLS-2 has introduced a systematic method for controlling the Linear Optics beyond some 20 years of TME inspired paper designs; by introducing Reverse Bends to disentangle dispersion and focusing, which enables Longitudinal Gradient Bends to efficiently reduce the emittance. Similarly, we outline a systematic approach for how to control the Nonlinear Dynamics for these systems, by a method that was pioneered for the conceptual design of the Swiss Light Source in the mid-1990s; subsequently benchmarked and validated by the commissioning.	Jun 2018

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