First optics and beam dynamics studies on the MAX IV 3 GeV storage ring

Leemann, Simon; Sjöström, Magnus; Andersson, Åke

doi:10.1016/j.nima.2017.11.072

Cited by 17 publications

(10 citation statements)

References 17 publications

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“…This can be recognized by comparison with the DA including machine imperfections that resulted from the short-term (1st stage) upgrade optics [13]. While the level of machine imperfections (which appear to match the actually encountered situation during commissioning quite well [9]) does not substantially reduce DA at injection, it does indicate that about 6 mm of DA are required to ensure that roughly 5 mm remain available as required for injection on the ring inside [20][21][22]. Further nonlinear optimization (possibly including breaking up the existing five sextupole families as per the 3rd upgrade stage) is expected to add the roughly 1 mm still needed and thus demonstrate feasibility of the proposed upgrade optics.…”

Section: Nonlinear Optics and Beam Dynamicsmentioning

confidence: 99%

“…The MAX IV 3 GeV storage ring is the first light source to make use of a multibend achromat lattice to reach ultralow emittance [1][2][3][4][5][6][7][8]. As the commissioning of this storage ring progresses, crucial parameters such as machine functions, emittance, and stored current have either already been reached or are approaching their design specifications [9]. Once the design parameters are achieved, the electron beam brightness will be unmatched thanks to top-off injection keeping stored current constant at 500 mA and a bare lattice emittance of 328 pm rad that is expected to reduce towards ≈ 190 pm rad as additional insertion devices (IDs) are added and ID gaps are closed [10].…”

Section: Introductionmentioning

confidence: 99%

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Pushing the MAX IV 3 GeV storage ring brightness and coherence towards the limit of its magnetic lattice

Leemann

Wurtz

2018

Nuclear Instruments and Methods in Physics Research Section A:

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The MAX IV 3 GeV storage ring is presently being commissioned and crucial parameters such as machine functions, emittance, and stored current have either already been reached or are approaching their design specifications. Once the baseline performance has been achieved, a campaign will be launched to further improve the brightness and coherence of this storage ring for typical X-ray users. During recent years, several such improvements have been designed. Common to these approaches is that they attempt to improve the storage ring performance using existing hardware provided for the baseline design. Such improvements therefore present more short-term upgrades. In this paper, however, we investigate medium-term improvements assuming power supplies can be exchanged in an attempt to push the brightness and coherence of the storage ring to the limit of what can be achieved without exchanging the magnetic lattice itself. We outline optics requirements, the optics optimization process, and summarize achievable parameters and expected performance. Published by Elsevier B.V. 1 This is an important restriction in the MAX IV 3 GeV storage ring because most magnets in the achromat are connected in series to a common power supply for the entire family. 2 The transverse focusing gradients are provided by the shape of the dipole iron poles, however, the pole-face strips (PFSs) installed in each dipole allow a ±4% variation of this gradient, sufficient to move about ±0.5 in tune space.

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Section: Nonlinear Optics and Beam Dynamicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pushing the MAX IV 3 GeV storage ring brightness and coherence towards the limit of its magnetic lattice

Leemann

Wurtz

2018

Nuclear Instruments and Methods in Physics Research Section A:

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“…As more and more low emittance sources are been built or planned [1][2][3][4][5] , the coherence of the X-ray beam starts to play an important role. However, the great advances of coherent X-ray sources make the tolerances on optical elements more stringent if the high coherence originating at the source is to be preserved throughout the beamline.…”

Section: Introductionmentioning

confidence: 99%

Perturbation perspective of partial coherence discussion on imperfect x-ray optical elements

Sutter

Wang

et al. 2020

Advances in Computational Methods for X-Ray Optics V

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The rapid development of new-generation synchrotron facilities with excellent coherence demands more accurate evaluation of beamline performance. A perturbation theory based on wave optics is proposed in this work to describe the effect of imperfections on the performance of X-ray optical elements. It shows that the perturbed performance of the non-ideal optical element could be derived from the perfect performance of the ideal optic through a convolution operation. The semi-analytical approach proposed here provides a new way to improve the simulation efficiency for imperfect optical elements. The finite aperture effect on diffraction-limited optics and focal shape distortion by surface height error are treated to show the application of the proposed method.

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“…In recent years, there have been remarkable improvements on the design of ultra-low emittance storage rings. Thanks to the applications of the concepts of Multi-Bend Achromat (MBA) [2], Longitudinal Gradient Bends (LGBs) [3], and Anti-Bends (ABs) [4], an emittance of the order of 100 pm (or even lower) has been achieved in many new designs of storage rings and measured at MAX IV [5] during early commissioning. All the above mentioned concepts are employed in the design of the storage ring for the Swiss Light Source Upgrade (SLS-2) [6].…”

Section: Introductionmentioning

confidence: 99%

Calculation of longitudinal collective instabilities with mbtrack-cuda

Locans

Adelmann

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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Macro-particle tracking is a prominent method to study the collective beam instabilities in accelerators. However, the heavy computation load often limits the capability of the tracking codes. One widely used macro-particle tracking code to simulate collective instabilities in storage rings is mbtrack. The Message Passing Interface (MPI) is already implemented in the original mbtrack to accelerate the simulations. However, many CPU threads are requested in mbtrack for the analysis of the coupled-bunch instabilities. Therefore, computer clusters or desktops with many CPU cores are needed. Since these are not always available, we employ as alternative a Graphics Processing Unit (GPU) with CUDA programming interface to run such simulations in a stand-alone workstation. All the heavy computations have been moved to the GPU. The benchmarks confirm that mbtrackcuda can be used to analyze coupled bunch instabilities up to at least 484 bunches. Compared to mbtrack on an 8-core CPU, 36-core CPU and a cluster, mbtrack-cuda is faster for simulations of up to 3 bunches. For 363 bunches, mbtrack-cuda needs about six times the execution time of the cluster and twice of the 36-core CPU. The multi-bunch instability analysis shows that the length of the ion-cleaning gap has no big influence, at least at filling to 3 ⁄4.1 Haisheng.Xu@ihep.ac.cn, the author is presently in the Institute

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First optics and beam dynamics studies on the MAX IV 3 GeV storage ring

Cited by 17 publications

References 17 publications

Pushing the MAX IV 3 GeV storage ring brightness and coherence towards the limit of its magnetic lattice

Pushing the MAX IV 3 GeV storage ring brightness and coherence towards the limit of its magnetic lattice

Perturbation perspective of partial coherence discussion on imperfect x-ray optical elements

Calculation of longitudinal collective instabilities with mbtrack-cuda

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