Longitudinally Variable Field Dipole Design Using Permanent Magnets For CLIC Damping Rings

Martinez, Manuel Angel Dominguez; Toral, Fernando; Ghasem, Hossein; Papadopoulou, Parthena Stefania; Papaphilippou, Y.

doi:10.1109/tasc.2018.2795551

Cited by 6 publications

(8 citation statements)

References 6 publications

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“…Among the non-uniform dipoles studied, it is found that the one having a bending radius forming a trapezium profile gives the largest emittance reductions. The design of the hyperbolic field profile that uses permanent magnets reaches the 2.3 T at the highest field region and gives very good results in terms of emittance reduction [11]. In addition, this innovative design could be applied in any low emittance ring.…”

Section: Discussionmentioning

confidence: 99%

“…So, the range of the following plots is regulated by the restriction of λ, ρ > 0.04. Based on the optimal variable bend characteristics, the design of a magnet that can give the final specifications of the dipole to be fabricated is under study [10,11].…”

Section: A the Relation Between The Reduction And The Detuning Factormentioning

confidence: 99%

“…Therefore, the fabrication of a variable bend having a bending radius that forms a trapezium shape is of interest. According to the optimal characteristics of a trapezium dipole profile to be used for the CLIC Damping Rings, the magnetic design of a longitudinally variable bending dipole based on permanent magnets was studied and the prototype will be fabricated by CIEMAT [10,11]. The main challenges of this design are the bending radius variation which should change linearly along the magnet and the high field region length that is very short.…”

Section: Longitudinally Variable Field Dipole Design For the Clicmentioning

confidence: 99%

See 2 more Smart Citations

Emittance reduction with variable bending magnet strengths: Analytical optics considerations and application to the Compact Linear Collider damping ring design

Papadopoulou

Antoniou

Papaphilippou

2019

Phys. Rev. Accel. Beams

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One of the main challenges of the lattice design of e + e − synchrotrons, used as light sources or damping rings, is the minimization of the emittance. The optimal configurations for achieving the absolute minimum emittance are the theoretical minimum emittance (TME) cells. This paper elaborates the optimization strategy in order to further reduce the betatron emittance of a TME cell by using dipoles whose magnetic field varies longitudinally. Based on the analytical results, the magnet design for the fabrication of variable bend with the optimal characteristics is discussed. In order to have a global understanding of all cell properties, the analytical approach for the theoretical minimum emittance (TME) cells with variable bends is presented. Numerical examples for the linear optimization of the Compact Linear Collider (CLIC) damping rings (DRs) are shown. The margin provided by this new design strategy on the output beam parameters after including the dominant effect of intrabeam scattering, enables the removal of a number of TME cells from the existing arcs while still keeping the requirements of the collider. The reduction of the circumference is further enhanced by the use of optimized high-field wigglers. The optimization strategy followed for the CLIC DRs is explained in detail and the output parameters of the new design are presented.

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Section: Discussionmentioning

confidence: 99%

Section: A the Relation Between The Reduction And The Detuning Factormentioning

confidence: 99%

Section: Longitudinally Variable Field Dipole Design For the Clicmentioning

confidence: 99%

See 1 more Smart Citation

Emittance reduction with variable bending magnet strengths: Analytical optics considerations and application to the Compact Linear Collider damping ring design

Papadopoulou

Antoniou

Papaphilippou

2019

Phys. Rev. Accel. Beams

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“…As variation of field in a longitudinal gradient bend can be chosen arbitrarily, a general closedform solution without detailed specification of the field is at least cumbersome, and a variety of different magnet profiles for LGBs have been considered, e.g. [7][8][9]. In this work, we show elementary properties of LGBs using a simple curvature function with only one free parameter (sec.…”

Section: Longitudinal Gradient Bend Cellsmentioning

confidence: 99%

“…LGBs have the potential to achieve sub-TME emittance by concentrating the quantum excitation in regions of vanishing dispersion, i.e. at the bend center [7][8][9]. And (weak) RBs at the cell ends are useful to reduce the dispersion at the LGB center by manipulating the periodic solution of the dispersion function [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Low emittance lattice design from first principles: Reverse bending and longitudinal gradient bends

Riemann

Streun

2019

Phys. Rev. Accel. Beams

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The well-known relaxed theoretical minimum emittance (TME) cell is commonly used in the design of multi-bend achromat (MBA) lattices for the new generation of diffraction limited storage rings. But significantly lower emittance at moderate focusing properties can be achieved by combining longitudinal gradient bends (LGB) and reverse bends (RB) in a periodic lattice unit cell.LGBs alone, however, are of rather limited gain.We investigate the emittance achievable for different unit cell classes as a function of the cell phase advance in a most general framework, i.e. with a minimum of assumptions on the particular cell optics. Each case is illustrated with a practical example of a realistic lattice cell, eventually leading to the LGB/RB unit cell of the baseline lattice for the upgrade of the Swiss Light Source.

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Design and Principles of Linear Accelerators and Colliders

Seeman

Schulte

Delahaye

et al. 2020

Particle Physics Reference Library

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Longitudinally Variable Field Dipole Design Using Permanent Magnets For CLIC Damping Rings

Cited by 6 publications

References 6 publications

Emittance reduction with variable bending magnet strengths: Analytical optics considerations and application to the Compact Linear Collider damping ring design

Emittance reduction with variable bending magnet strengths: Analytical optics considerations and application to the Compact Linear Collider damping ring design

Low emittance lattice design from first principles: Reverse bending and longitudinal gradient bends

Design and Principles of Linear Accelerators and Colliders

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