Linac Coherent Light Source
107 Proposals Received for November Call for LCLS Proposals

by Cathy Knotts
The third LCLS Call for Proposals ended on Wednesday, November 4 at 4 pm. This deadline was extended for an additional day after demand during the last few hours before the deadline temporarily overloaded our servers. We apologize for the delay and urge users to plan ahead and submit their proposals well in advance of the next deadline which is Thursday, April 1, 2010.

This last call resulted in 107 new proposals: 16 for AMO, 32 for SXR, and 59 for XPP. Proposals are now being processed to ensure completeness, then they will be forwarded to the LCLS Proposal Reviewer Panel (PRP) who will identify and coordinate external referees. The PRP will rank the proposals when they meet in Feburary 2010.

User assisted commissioning experiments scheduled for the current initial start up run, which ends December 17, 2009 are posted on the web at

The schedule for the next round of user assisted commissioning experiments is being finalized and should be announced shortly. These commissioning experiments should begin ~May 6 and continue through September 14, 2010.

To help users plan proposed experiments for the next call (due April 1st), please check the LCLS website for updated policies, see as well news about the latest operating parameters.

Currently we are limited to a spectral range down to 750 eV, and we will guarantee this spectral range for experiments scheduled in Spring and Fall 2010. We are also developing operations at lower energies, down to 510 eV. We cannot guarantee it at this time (subject to Radiation Physics review and approval), but we are confident enough to solicit proposals for the Fall 2010.

The minimum pulse duration in standard operation is ~ 70 femtoseconds FWHM. We have developed lower current operation which is now available for users. In this low current moded pulse lengths have been shown to be less than 20 femtoseconds. We believe the pulses are much shorter (for reference see and solicit proposals to measure this.

The maximum repetition rate of the X-ray flashes is expected to be 60 Hz and we are working on moving to 120 Hz.

Questions? Comments? You can contact the author at