Jun 25 – 27, 2018
Stockholm, Alba Nova
Europe/Stockholm timezone

Recent Developments at LCLS and Science Opportunities and Plans for LCLS-II and LCLS-II-HE

Jun 25, 2018, 2:00 PM
30m
Oskar Klein Auditorium (Stockholm, Alba Nova)

Oskar Klein Auditorium

Stockholm, Alba Nova

Stockholm University
Invited oral New developments

Speaker

Robert Schoenlein (LCLS SLAC National Accelerator Laboratory)

Description

The unique capabilities of LCLS, the world’s first hard X-ray FEL, have had significant impact on advancing our understanding across a broad range of science, from fundamental atomic and molecular physics, to condensed matter, to catalysis, to structural biology. This talk will outline some of the ongoing developments at LCLS.

A major upgrade of the LCLS facility (LCLS-II project) is now underway. LCLS-II is being developed as a high-repetition rate X-ray laser with two simultaneously operating, independently tunable FELs. The baseline design features a 4 GeV continuous wave superconducting linac (CW-SCRF) that is capable of producing uniformly spaced (or programmable) ultrafast X-ray laser pulses at a repetition rate up to ~1 MHz spanning the energy range from 0.25 to 5 keV. The superconducting linac will be installed in the first third of the SLAC linac tunnel. The final third of the SLAC linac will continue to operate as a warm Cu accelerator at energies up to 15 GeV, providing tunable X-rays with photon energy up to 25 keV at 120 Hz. Four new instruments are planned to exploit the new capabilities of LCLS-II. One instrument will support AMO science, strong-field science, and a new dynamic reaction microscope. Two instruments will rely on a monochromator to support high-resolution and moderate-resolution soft X-ray spectroscopy at close to the Fourier transform limit. A fourth instrument will operate in the tender X-ray range (1-7 keV) and will be capable of combining pulses from both the soft X-ray and hard X-ray FELs.

Projected photons per pulse (left) and average brightness (right) for LCLS-II and proposed LCLS-II-HE, including future X-ray facilities: the European XFEL and diffraction-limited storage rings (DLSRs).

Projected photons per pulse (left) and average brightness (right) for LCLS-II and proposed LCLS-II-HE, including future X-ray facilities: the European XFEL and diffraction-limited storage rings (DLSRs).

Looking to the future, there is a compelling opportunity to upgrade the energy of LCLS-II (LCLS-II-HE). By adding CW-SCRF cryomodules, the electron beam energy can be doubled to 8 GeV, thus increasing the spectral reach of the hard X-ray undulator (HXU) to more than 12 keV. Anticipated improvements in electron beam emittance will extend the energy reach to 20 keV. This will enable the study of atomic-scale dynamics with the penetrating power and pulse structure needed for in situ and operando time-resolved studies of real-world materials, functioning assemblies, and biological systems.

This talk will present some of the important science opportunities and instrumentation being planned for LCSL-II and LCLS-II-HE.

Primary author

Robert Schoenlein (LCLS SLAC National Accelerator Laboratory)

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