Longitudinal Gradient Bend Magnets for the Upgrade of the Swiss Light Source Storage Ring

Calzolaio, Ciro; Gabard, A.; Lerch, Philippe; Montenero, Giuseppe; Negrazus, M.; Sanfilippo, S.; Сидоров, С. К.; Vranković, V.

doi:10.1109/tasc.2020.2973113

Cited by 4 publications

(5 citation statements)

References 2 publications

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“…The magnet length, the integral magnetic field and the highest magnetic field are finally most concerned. This paper studies how the structure parameters of a magnet model similar to ALS Superbend [10] or SLS-2 SLGB [6,7] affect the longitudinal magnetic field profile and the field homogeneity. To achieve the lattice design requirements for the SLGB, it is necessary to adjust both the geometric parameters of the magnet model and the current values.…”

Section: Jinst 18 P06003mentioning

confidence: 99%

“…The yoke and pole change the spatial magnetoresistance and thus the axial magnetic field. In the SLGB design scheme of SLS-2 [6,7], four coaxial coils (divided into two groups) are used to generate the required B-field profile, where the outermost coils are circular and the innermost coils are racetrack-shaped. Therefore, the longitudinal magnetic field profile can be adjusted by simultaneously changing the current density of the four coils while keeping the integral magnetic field constant.…”

Section: Influence Of Ferromagnetic Materials Pole and Yoke On Slgb M...mentioning

confidence: 99%

“…SLGB magnets are considered to be used in some cells of the lattice of SLS-2, and two preliminary magnet designs have been presented successively [6,7]. ALS-U also proposed a design of superconducting Superbend whose structure is similar to a SLGB [8], but the electromagnetic design and optimization of SLGBs have not been studied in detail so far.…”

Section: Introductionmentioning

confidence: 99%

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Electromagnetic design study of a superconducting longitudinal gradient bend magnet based on the HALF storage ring

et al. 2023

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The National Synchrotron Radiation Laboratory is planning to build a 2.2 GeV diffraction-limited storage ring, the Hefei Advanced Light Facility (HALF), with a 6BA lattice structure and a large number of longitudinal gradient bends (LGBs). In order to increase the radiated photon energy to the hard X-ray band and to reduce the natural emittance, a superconducting longitudinal gradient bend (SLGB) magnet is planned to be used on HALF in the future, which requires a magnetic field integral of 0.40 T·m over a length of 0.46 m and a peak field of about 5 T. A SLGB has many structural parameters, such as the geometric parameters of the superconducting coils and the thickness of the yoke, etc. Their influence on the magnetic field distribution has been studied, although the computation of the 3D magnet model is very slow. Considering the longitudinal field variation, the vertical gap limitation, the field homogeneity requirement and the critical current of the superconducting wire, a method is developed to simplify the 3D magnet simulation by a corresponding 2D model, so that the longitudinal magnetic field profile of a 3D model can be approximately calculated in a 2D model with faster speed. Due to the faster calculation speed of 2D models, a Mathematica-based optimization program is developed and relatively good structural parameters for the HALF SLGB are found by the program. The simulation results show that the physical design requirements can be well met. The electromagnetic design for the HALF SLGB magnet is based on the current JC level of NbTi superconductor due to its excellent mechanical performance.

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Section: Jinst 18 P06003mentioning

confidence: 99%

Section: Influence Of Ferromagnetic Materials Pole and Yoke On Slgb M...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electromagnetic design study of a superconducting longitudinal gradient bend magnet based on the HALF storage ring

et al. 2023

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“…Published data were not found by the authors. r A longitudinal gradient bend magnet was built for SLS-2 [27]. Additionally to the data of the projects mentioned above data are presented for CLIC or LINAC4 magnets.…”

Section: Magnets Overviewmentioning

confidence: 99%

Magnets for Low-Emittance Storage Rings an Overview

Schnizer

Bengtsson

2022

IEEE Trans. Appl. Supercond.

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Low emittance machines require lattices with many magnets of short length. Furthermore, successful lattices require strong gradients with strong dipole fields. These lattices are popular today, as MAX IV has demonstrated that a diffraction limited synchrotron light source can be based on such a lattice. This paper gives an overview of the various magnets used by the various diffraction limited light sources -available, under construction or designed. It compares the different magnet design and technology used and presents the magnet parameters in a consistent fashion.

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“…With these requirements, a new set of high-gradient magnets based on permanent blocks, normal-conducting coils and super-conducting ones is under the design phase. Among them, a superconducting dipole providing a longitudinal gradient has been designed, reaching a peak field of 6 T [23,24]. The performances of these magnets have to be assessed before installation in the machine.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Estimation of Measurement Uncertainty in Magnetic Field Mapping

Marca

Tarabini

Lerch

et al. 2022

IEEE Trans. Instrum. Meas.

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This paper proposes a general method to model and simulate the process of magnetic field mapping; aim of our work is the combination of the effect of the bench position uncertainty with the magnetic measurements' uncertainty. The method is based on the study of the positioner kinematics using a multi-body system approach. The geometrical errors of the manipulator, including the manufacturing tolerances and the assembling non-idealities are included in the model using the homogeneous transformation matrix, to numerically estimate the end effector positioning uncertainty Up. The positioning uncertainty is then combined with the magnetic measurement uncertainty using the magnetic field gradient as a sensitivity coefficient; in presence of strong field non-linearities, the combination can be performed using Monte Carlo simulations in order to estimate how Up propagates to the magnetic measurement uncertainty U f at different positions. The method has been validated in the specific case of the Compact Field Mapper, a bench featuring a Cartesian robot and a triaxial Hall sensor used to measure flux density maps in the accessible region of interest of the magnets of the Swiss Light Source, with an uncertainty below 0.5 %. The method allowed to define, during the design phase, the characteristics of the positioning system (i.e. the mechanical positioning uncertainty Up) in order to obtain the desired magnetic measurement uncertainty U f . Simulations and experiments in the case of a reference quadrupole are presented and discussed.

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Longitudinal Gradient Bend Magnets for the Upgrade of the Swiss Light Source Storage Ring

Cited by 4 publications

References 2 publications

Electromagnetic design study of a superconducting longitudinal gradient bend magnet based on the HALF storage ring

Electromagnetic design study of a superconducting longitudinal gradient bend magnet based on the HALF storage ring

Magnets for Low-Emittance Storage Rings an Overview

Numerical and Experimental Estimation of Measurement Uncertainty in Magnetic Field Mapping

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