Lattice design of the UVSOR-IV storage ring

Abstract

We are designing a storage ring lattice for the future plan of UVSOR. As a candidate, we have designed a storage ring of 1 GeV electron energy, which is higher than the present value, 750 MeV. The magnetic lattice is based on a compact double bend achromat cell, which consists of two bending magnets and four focusing magnets, all of which are of combined function. The circumference is 82.5 m. The emittance is 4 nm in the achromatic condition, which becomes lower in the non-achromatic condition. The lattice has moderately large dynamic aperture with four sextupole families. The lattice of 6-fold symmetry has six straight sections of 4 m long and six of 1.5 m long. Undulators can radiate nearly diffraction-limited light in VUV. If we install high field multipole wigglers at the short straight sections, they can provide high flux tender X-rays. We are expecting usage of a laser-based accelerator as the injector, which might be developed in the next decade. As an alternative plan, we have designed a traditional injector, which consists of a linear accelerator and a booster synchrotron that can be constructed inside of the storage ring.

Bayesian optimization of the dynamic aperture in UVSOR-IV design study

“…We found a few optics which has smaller emittance around 10 nm than the present value, 17 nm [9]. To reach the lower emittance around a few nm, we have designed a totally new storage ring, UVSOR-IV which has higher electron energy, 1 GeV, a larger circumference, 82.5m, and small emittance around 4 nm [10]. The lattice consists of twelve double bend cells.…”

Prospects required for future light-source facilities: a case of UVSOR synchrotron facility

“…The good footwork unique to small-scale facilities has promoted the development of quantum beams like optical vortices, pulsed-gamma ray using SR light, and so on by accelerator researchers, which is highly unique even from an international perspective [39][40][41][42][43][44][45][46][47]. In the future, it would be interesting to develop the SR facility as a giant quantum simulator for controlling quantum states and measuring quantum information using multiple undulator light sources.…”

“…By integrating mature elemental technologies, the system will be able to enhance stability and ensure versatility, such as switching SR operation modes, and will aim to achieve diffraction-limited light source performance over a wide range of energies and increase luminance. Technically mature double-bend achromatic cells will be arranged so that several long straight sections can be placed within the limited circumference [46]. Both insertion light devices and dipole light sources are expected to improve by one order of magnitude for brilliance.…”