First multi-bend achromat lattice consideration

Abstract

By the beginning of 1990, three third-generation synchrotron light sources had been successfully commissioned in Grenoble, Berkeley and Trieste (ESRF, ALS and ELETTRA). Each of these new machines reached their target specifications without any significant problems. In parallel, already at that time discussions were underway regarding the next generation, the `diffraction-limited light source (DLSR)', which featured sub-nm rad electron beam emittance, photon beam brilliance exceeding 1022and the potential to emit coherent radiation. Also, at about that time, a first design for a 3 GeV DLSR was developed, based on a modified multiple-bend achromat (MBA) design leading to a lattice with normalized emittance of ∊x= 0.5 nm rad. The novel feature of the MBA lattice was the use of seven vertically focusing bend magnets with different bending angles throughout the achromat cell to keep the radiation integrals and resulting beam emittance low. The baseline design called for a 400 m ring circumference with 12 straight sections of 6 m length. The dynamic aperture behaviour of the DLSR lattice was estimated to produce > 5 h beam lifetime at 100 mA stored beam current.

PETRA IV: the ultralow-emittance source project at DESY

“…In recent years, a new (fourth) generation of light sources has been emerging based on new storage-ring lattice types, i.e. the multi-bend achromat (MBA) in several variants (Einfeld et al, 1994(Einfeld et al, , 2014MAX-Lab, 2010;ESRF, 2014). The new concept allows for a significant reduction of the horizontal emittance compared with existing facilities.…”

Optimization of a phase-space beam position and size monitor for low-emittance light sources

“…The new-generation synchrotron facilities are being designed and built to achieve an ultra-small emittance utilizing multibend achromat (MBA) lattices (Einfeld et al, 2014).…”

An X-ray harmonic separator for next-generation synchrotron X-ray sources and X-ray free-electron lasers

“…Continuous evolution of synchrotron radiation (SR) X-ray sources has strongly driven innovative sciences. The nextgeneration SR X-ray sources based on a multi-bend achromat lattice (Hettel, 2014;Einfeld et al, 2014), sometimes called diffraction-limited storage rings, are currently emerging (Biasci et al, 2014;Eriksson et al, 2014;Yabashi & Tanaka, 2017). Compared with the present third-generation SR sources, the new SR sources produce X-ray beams from electron beams with much smaller emittances (the product of the spatial size and the angular spread of the particle/optical beam) closer to a natural emittance of X-ray light, which significantly enhances the brilliance of undulator radiation.…”