Complex bend: Strong-focusing magnet for low-emittance synchrotrons

Modern synchrotron light sources are competing intensively to increase x-ray brightness and, eventually, approach the diffraction limit, which sets the final goal of lattice emittance. All recent synchrotron facility upgrades follow the multibend achromat approach by arranging small horizontal beta...

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Bibliographic Details
Published in:Physical review. Accelerators and beams 2018-10, Vol.21 (10), p.100703, Article 100703
Main Authors: Wang, G., Shaftan, T., Smaluk, V., Mezentsev, N. A., Sharma, S., Chubar, O., Hidaka, Y., Spataro, C.
Format: Article
Language:English
Subjects:
beam dynamics
beam optics
Bending
Bends
cryogenics & vacuum technology
Design engineering
Dipoles
Dispersion
Emittance
Lattices
Light sources
PARTICLE ACCELERATORS
Storage rings (particle accelerators)
superconducting magnet calculations
Synchrotron radiation
Synchrotrons
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Summary:Modern synchrotron light sources are competing intensively to increase x-ray brightness and, eventually, approach the diffraction limit, which sets the final goal of lattice emittance. All recent synchrotron facility upgrades follow the multibend achromat approach by arranging small horizontal beta function and dispersion inside discrete bending dipoles. In this paper we propose a concept of a lattice element that we call “complex bend,” which has the potential of becoming a main building block for low emittance lattices. The complex bend is a sequence of dipole poles interleaved with strong alternate focusing so as to maintain the beta function and dispersion oscillating at low values. Comprising the ring lattice with complex bends, instead of regular dipoles, will minimize theH-function and reduce horizontal emittance while localizing bending to a small fraction of the storage ring circumference, which should provide more space for insertion devices. In this paper we present the details of the complex bend, considerations regarding the choice of optimal parameters, and thoughts for its practical realization. We focus here on complex bend physics and engineering design, rather than integration of this complex bend into a specific ring lattice.
ISSN:2469-9888
2469-9888
DOI:10.1103/PhysRevAccelBeams.21.100703