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

The latest CLIC damping ring lattice is based on magnets with longitudinally variable dipole fields in order to achieve ultralow beam emittance while keeping the ring circumference small. These magnets need to provide a focusing gradient of 11 T/m as well. The good field region radius is 5 mm. The f...

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Bibliographic Details
Published inIEEE transactions on applied superconductivity Vol. 28; no. 3; pp. 1 - 4
Main Authors Dominguez Martinez, Manuel Angel, Toral, Fernando, Ghasem, Hossein, Papadopoulou, Parthena Stefania, Papaphilippou, Yannis
Format Journal Article
LanguageEnglish
Published IEEE 01.04.2018
Subjects
CLIC damping rings
combined function dipole
Computational modeling
longitudinal variable field dipole
Magnetic flux
Magnetic tunneling
Magnetomechanical effects
Permanent magnets
Saturation magnetization
Superconducting magnets
variable bends
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Summary:The latest CLIC damping ring lattice is based on magnets with longitudinally variable dipole fields in order to achieve ultralow beam emittance while keeping the ring circumference small. These magnets need to provide a focusing gradient of 11 T/m as well. The good field region radius is 5 mm. The field harmonics shall be in the order of 1E-4 of the main one. Since only a small variation of the field is requested, permanent magnets are the most cost-effective solution. Beam dynamics calculations have provided idealized field profiles, and magnetic calculations have been performed to check their feasibility. FEM electromagnetic computations are complicated because the cross-section of the magnet is not constant. Therefore, iron poles cannot be modeled by extrusion, and only 3-D computations are meaningful. Finally, this paper shows that small variations of field strength are possible by using movable parts.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2018.2795551