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Welcome to the LCLS User Resources Site

User Portal | Agreements | Data Collection & Analysis | Logistics | Policies | Proposals | Safety | Schedules | Shipping

* IMPORTANT CHANGES TO USER BADGING & ACCESS AS OF OCTOBER 2014, only SLAC Security will issue SLAC ID badges and proximity access. Please inform your colleagues and alert us in advance who will participate in your scheduled experiments.

The Linac Coherent Light Source (LCLS) encourages scientists from diverse fields to submit proposals for experiments that utilize the LCLS's unique capabilities. Interested scientists are encouraged to learn more about the latest developments by contacting LCLS staff scientists and by reviewing the instrument descriptions.

LCLS Instruments and Beam Lines
Atomic, Molecular and Optical Science (AMO)
Beam Line for Soft X-ray Science (SXR)
X-ray Pump Probe (XPP)
Coherent X-ray Imaging (CXI)
X-ray Correlation Spectroscopy (XCS)
The split and delay capability is still under commissioning for the XCS instrument.
Matter in Extreme Conditions (MEC)

We have demonstrated FEL operations over the energy range 280 eV to 11.2 keV using the fundamental with pulse energies of at least 1-3 mJ depending on the pulse duration and photon energy (please note that operation above 10 keV requires special accelerator conditions that may not be available at all times). Third harmonic radiation is available up to 25 keV at about 1% of the fundamental pulse energy. The pulse length can be varied from 40 fs to 300 fs for hard X-rays, while for soft X-rays the range is extended to 500 fs. Shorter pulses, <10 fs, with a reduced number of photons per pulse can also be provided. The maximum repetition rate of the LCLS is 120 Hz (please note that this may be reduced to 115 Hz at certain time periods).

For users who require a monochromator, seeded beams can provide 2 to 4 times more photons per pulse than SASE beams, and with similar pulse durations and shot-to-shot intensity fluctuations. The narrow seeded line, 0.4 to 1.1 eV fwhm, for 50 fs pulse duration typically contains an average pulse energy of 0.3 mJ, with occasional shots up to 1 mJ. It is accompanied by a relatively broadband SASE background of comparable total energy. Seeded beams are available from 5.5 keV to 9.5 keV and can be tuned up from a SASE beam in about 30 minutes.

We are continuing to upgrade the soft x-ray source parameters of LCLS. Soft x-ray self-seeding has been demonstrated across the range of 500-1000 eV and the Delta Undualtor will be installed in the fall of 2014 providing variable polarization, including left/right circular. Both capabilities are planned to be in routine operation for Run 12 and might be available in Run 11. For more information please contact the Soft X-ray instrument scientists. srd-sxd @at

LCLS is currently developing "two color" operating modes, where pairs of FEL pulses are produced with about 1% photon energy separation, in both the hard and soft X-ray regimes. We will accept proposals utilizing two color operation. A polarization control undulator is planned to be installed in the LCLS this fall and will provide arbitrarily polarized radiation with limited intensity in the soft x-ray regime. Please contact the respective instrument scientists for updated performance parameters as you prepare your proposal.

SUBMIT NEW PROPOSALS BY 4 pm PACIFIC on February 3, 2015. View the latest long range operating schedule.

See PCS details.

Check back later for details related to OPTICAL-LASER-ONLY PROPOSALS for the MEC instrument

Instruments Included in Call for Proposals Proposal Deadline
AMO, SXR, XPP, CXI, XCS, MEC February 3, 2015
CXI, XPP (Protein Crystal Screening) May 5, 2015

Proposals, safety training, user registration and user check-in are centralized to ensure prompt and efficient service to our users. A call for proposals will be solicited twice per year, and a successful proposal will be eligible to receive beam time about 9 months after being submitted.

Prior to arrival at LCLS, users are required to register as a new user or update their contact information through the User Portal. See step-by-step instructions above and links related to information for foreign users and logistics

We look forward to working with you and to highlighting your research through our website and newsletter.

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