DLSR design and plans: an international overview
1Accelerator Directorate, SLAC National Accelerator Laboratory, MS 103, 2575 Sand Hill Road, Menlo Park, CA 94025, USA.
Journal of Synchrotron Radiation
|September 2, 2014
Summary
Fourth-generation light sources utilize multi-bend achromat (MBA) lattices to achieve ultra-low emittance, enabling diffraction-limited storage rings (DLSRs) for advanced X-ray applications. This review covers global designs and plans for these next-generation synchrotron facilities.
Area of Science:
- Accelerator Physics
- Synchrotron Radiation Technology
- X-ray Science
Background:
- Multi-bend achromat (MBA) lattices have long been known to reduce storage ring emittance.
- Achieving diffraction-limited storage ring (DLSR) emittance for multi-keV photons required advancements in vacuum systems and beam dynamics simulation.
- The MAX IV and Sirius projects represent the vanguard of fourth-generation light source designs.
Purpose of the Study:
- To review current fourth-generation storage ring design concepts and global implementation plans.
- To highlight the technological advancements enabling DLSRs.
- To discuss the potential for future ultra-low emittance rings.
Main Methods:
- Review of existing and planned fourth-generation synchrotron light source projects worldwide.
- Analysis of multi-bend achromat (MBA) lattice designs and their impact on emittance.
- Discussion of enabling technologies such as small-aperture vacuum systems and advanced beam dynamics simulations.
Main Results:
- Fourth-generation light sources, exemplified by MAX IV and Sirius, achieve an order of magnitude lower horizontal emittance than third-generation machines.
- Several major facilities (ESRF, APS, SPring-8) are planning MBA lattice upgrades.
- Future large-circumference rings could achieve sub-10-pm-rad emittances for highly coherent X-rays.
Conclusions:
- Fourth-generation light sources are ushering in a new era of synchrotron radiation capabilities.
- MBA lattices and advanced accelerator technologies are key to achieving DLSR performance.
- Future developments promise even higher coherence X-rays for scientific discovery.
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