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LCLS Run 16 Proposals Due

Category: Experiment


This is a call for proposals for experiments at LCLS  using the AMO, SXR, XPP, CXI, MFX, XCS, and MEC Experimental Stations for the period November, 2017 – June, 2018 (“Run 16”).

The DEADLINE is  4 pm  PACIFIC on  May 4, 2017
For full details of the call, see:
Please note the following important information specific to this call:
1.   Since Run 13, LCLS has been running in a new mode of operation, called  Standard Configuration Beam Time . Selected areas will operate for ~25% of Run 16 (possibly more if user demand is high) in a contiguous block of time during which the instrument will be in a Standard Configuration. The intent is to reduce the amount of time that is taken each run tearing down, setting up, and testing the same configurations at different times throughout the run. The reduced amount of setup and test time has resulted in significantly more users and experiments being allocated beam time. If you feel your experiment is able to operate in a Standard Configuration for one of the instruments, please indicate this in your proposal and follow the directions provided.  See further details.

2.   SSRL Beam Time. User feedback has suggested that for some LCLS proposals, the science case can be significantly enhanced by having access to SSRL beam time in addition to proposed LCLS time. For this run 16 proposal call, LCLS will consider a limited number of proposals that make a strong scientific case for beamtime access to SSRL. These proposals should indicate how much time is requested, when the time would be needed relative to the LCLS time, as well as which SSRL beamline would be needed. If Users have questions about which SSRL beamlines would be appropriate for the proposed scientific goals, please contact Piero Pianetta ( Scheduling of time across facilities is complicated and availability depends strongly on which of the SSRL beamlines is requested.

3.  New capabilities offered for Run 16: Sub-Femtosecond Operation, during Run 16 we expect to be able to deliver sub-fs soft-X-ray pulses with a new XFEL configuration known as XLEAP. This will use a high-power infrared laser to compress a short fraction of the electron bunch to very high current. The setup is anticipated to be able to deliver ~0.5 fs pulses with a large coherent bandwidth, which is controllable using the space-charge boost given by the long LCLS undulator. XLEAP is predicted to be able to deliver a single sub-fs pulse or a train of pulses separated by ~ 6.8 fs. The expected XLEAP performance is as follows. Please note however that testing of this system will occur during Run 15, and so actual performance is not yet known. The system is thus being offered “at risk”.

  • ~ 30-50 uJ per pulse
  • ~ 0.5 fs FWHM pulse duration
  • 4 to 8 eV FWHM bandwidth

Expected setup times are on the order of 3-4 hours.  Submitted proposals shouldn't rely solely on XLEAP’s performance & robust operation, but preparing experiments/proposals that would work without XLEAP, but could benefit from it when it becomes available is strongly advised. For more information, please contact Mike Minitti (

Split-and-Delay for XCS, a crystal-based split-and-delay system will be commissioned during Run 15 and is planned to be available for user experiments in Run 16. It consists of two four-bounce monochromator branches delayed relative to each other. It will be available exclusively on the XCS instrument. It will operate in a range of 7-12 keV with a delay range from roughly -5 to 350 ps at 8 keV, with varying ranges as a function of energy. Up to 1 ns delay is possible if one branch is bypassed. Contact Diling Zhu ( for more details. 

New modes of beam operation, for up-to-date information on LCLS performance, please contact the respective instrument e-mail address listed below, and see the FAQ at:
A number of 2-pulse modes of operation are under constant development. See LCLS for up-to-date information. For a summary of some key options, see:   

Experimental stations available to users:
Atomic, molecular and optical science (AMO)  - contact
Soft X-ray Material Science (SXR)  - contact
X-ray Pump Probe (XPP)  - contact
Coherent X-ray Imaging  (CXI)  - contact
Macromolecular Femtosecond Crystallography (MFX)  - contact
X-ray Correlation Spectroscopy (XCS)  - contact
Matter in Extreme Conditions (MEC)  - contact

For more general information about LCLS, see:

When: Thursday, May 4 2017, 08:00 AM - 5:00 PM (ET) (UTC -05:00) Eastern Time (US & Canada), Bogota, Lima
Where: LCLS