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| SPEAR3 | |
|---|---|
| Name | SPEAR3 |
| Location | Stanford, United States |
| Institution | SLAC National Accelerator Laboratory |
| Type | synchrotron light source |
| Beam | electrons |
| Energy | 3.0 GeV |
| Current | 500 mA |
| Circumference | 234 m |
| Commissioning | 2004 |
| Status | Operational |
SPEAR3
SPEAR3 is a third-generation synchrotron light source storage ring located at Stanford within the SLAC National Accelerator Laboratory complex. It provides high-brightness synchrotron radiation for a diverse community of users drawn from institutions such as Stanford University, Lawrence Berkeley National Laboratory, Argonne National Laboratory, Brookhaven National Laboratory, and industrial partners. The facility supports experiments across disciplines that intersect with major projects and facilities including Linac Coherent Light Source, Advanced Photon Source, European Synchrotron Radiation Facility, Diamond Light Source, and SPring-8.
SPEAR3 functions as a medium-energy, high-brightness storage ring optimized to deliver hard and soft synchrotron radiation to multiple beamlines for research in structural biology, materials science, chemistry, and engineering. It complements neighboring facilities such as Stanford Synchrotron Radiation Lightsource and interfaces with injector systems like the SLAC linear accelerator. SPEAR3 serves user programs associated with organizations including National Institutes of Health, Department of Energy, National Science Foundation, NASA, and private-sector collaborators like General Electric and Intel Corporation.
The storage ring evolved from earlier generations: the original SPEAR ring that hosted experiments involving teams from Bell Labs, CERN, DESY, and Lawrence Livermore National Laboratory. A major upgrade culminating in commissioning in 2004 followed planning efforts involving experts from Cornell University, Argonne National Laboratory, Brookhaven National Laboratory, Thomas Jefferson National Accelerator Facility, and advisory committees from DOE Office of Science. The upgrade drew on accelerator physics advances pioneered at facilities such as Daresbury Laboratory, MAX IV Laboratory, SOLEIL, and ESRF. Funding and project oversight included contributors from California Institute of Technology, University of California, Berkeley, University of California, Santa Cruz, and regional industry partners.
The lattice of the ring employs a multibend achromat-inspired design that leverages concepts developed at DESY and MAX IV Laboratory to minimize emittance and maximize brightness. The machine operates at 3.0 GeV electron energy with stored currents up to 500 mA in top-up mode; its circumference is approximately 234 m. Magnetic components include dipoles, quadrupoles, sextupoles, and corrector magnets sourced or developed in collaboration with Brookhaven National Laboratory and Argonne National Laboratory. Radiofrequency systems are derived from technology used at European XFEL and ISIS Neutron and Muon Source, while vacuum and diagnostic equipment incorporate advances from KEK and TRIUMF.
Injection is provided by a linear accelerator linked to the ring using technology shared with Linac Coherent Light Source, with injector commissioning supported by teams from Fermilab and SLAC. Beamlines at the ring serve endstations configured for macromolecular crystallography, coherent scattering, X-ray absorption spectroscopy, and tomography. Major beamlines are associated with collaborating institutions such as Stanford Synchrotron Radiation Lightsource, Lawrence Berkeley National Laboratory, University of Michigan, University of California, San Diego, and industrial consortia including Bayer and Pfizer. Instrumentation includes undulators, wigglers, monochromators, and mirror systems developed with expertise from European Synchrotron Radiation Facility and Diamond Light Source.
SPEAR3 supports structural biology programs that contributed to work recognized by awards like the Nobel Prize in Chemistry for techniques reliant on synchrotron sources, and hosts research collaborations with groups from Harvard University, Massachusetts Institute of Technology, Yale University, Columbia University, and Princeton University. Materials science experiments explore energy storage and conversion in projects linked to Argonne National Laboratory and Oak Ridge National Laboratory, while condensed matter research connects to efforts at Kavli Institute for Theoretical Physics and Max Planck Society institutes. Applied research includes semiconductor characterization for firms such as Intel Corporation and TSMC, and pharmaceutical structure determination for Merck & Co. and Roche.
Operating in top-up mode, the ring maintains stable beam current and high availability for user cycles scheduled by committees including representatives from DOE Office of Science and academic partners. Performance metrics—emittance, lifetime, and beam stability—have been benchmarked against machines like Advanced Light Source, Canadian Light Source, and NSLS-II, with continual optimization undertaken by accelerator physics groups from Cornell University and University of Oxford. Remote data collection and beamline automation draw on software frameworks developed with collaborators at European XFEL and Argonne National Laboratory.
Planned upgrades consider further emittance reduction, new insertion devices, and enhanced beamline detector systems in coordination with initiatives at National Synchrotron Light Source II, Advanced Photon Source Upgrade, and international partners including Canadian Light Source and SPring-8. Proposals involve collaborations with researcher networks at University of Tokyo, ETH Zurich, Imperial College London, Karolinska Institute, and industry stakeholders such as Siemens and Thermo Fisher Scientific to expand capabilities in time-resolved studies, coherent imaging, and in situ experiments. Long-term strategy aligns with regional and national science roadmaps guided by National Science Foundation and Department of Energy priorities.
Category:Particle accelerators Category:Synchrotron radiation facilities