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An Office of Science User Facility
LCLS-II Design

The LCLS-II Design

Working closely with DOE’s Office of Science, SLAC configured LCLS-II to meet requirements laid out by the Basic Energy Sciences Advisory Committee (BESAC). The conceptual design:

  • Adds a new, 4 GeV superconducting linac in an existing SLAC tunnel, avoiding the need for excavation.
  • Increases the repetition rate from 120 pulses per second to 1 million per second. It will be the world’s only X-ray free-electron laser capable of supplying a uniformly-spaced train of pulses with programmable repetition rate.
  • Provides a tunable source of X-rays, by replacing the existing undulator (used to generate X-ray laser pulses) with two new ones. This ability to tune the X-ray energy on demand will enable scientists to scan across a wide spectrum – opening up new experimental techniques and making efficient use of the valuable beam time.
  • Provides access to an intermediate X-ray energy range that is currently inaccessible with LCLS, but which is likely critical for studies of new materials, chemical catalysis and biology.
  • Extends the operating range of the facility from its current limit of ~11 keV x-rays to ~25 keV.
  • Supports the latest seeding technologies to provide fully coherent X-rays (at the spatial diffraction limit and at the temporal transform limit)
  • Maintains the existing copper-based warm linac and upgrades parts of the existing research infrastructure to take advantage of the new configuration.


Read more, Major Upgrade Will Boost Power of World’s Brightest X-ray Laser

SLAC SLAC National Accelerator Laboratory, Menlo Park, CA
Operated by Stanford University for the U.S. Dept. of Energy