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An Office of Science User Facility

Matter in Extreme Conditions (MEC)

This site is OBSOLETE as of 30 Oct. 2017
Please go to the new MEC site




Source Parameters

Photon Energy 2.5-12 keV for 1st harmonic*
Up to 25 keV for 2nd and 3rd harmonic
Source Size 60 x 60 µm2 (HxV) FWHM @ 8.3 keV
Source Divergence 2 x 2 µrad2 (HxV) FWHM @ 8.3 keV
Repetition Rate 120 Hz
Pulse Duration 60 - 300 fs (high charge mode)
<10 fs (low charge mode)
Pulse Energy 1-3 mJ (high charge mode)
~ 0.2 mJ (low charge mode)
Photons per Pulse ~1 x 1012 (high charge mode @ 8.3 keV)
~1 x 1011 (low charge mode @ 8.3 keV)
* Energies below 4 keV are in principle usable but the beam 
  size at the end station is large leading to reduced flux.


Photon Beam Properties

Focusing Capability A selection of compound refractive lenses
can be inserted in the beam to provide focusing
at a given energy. By locating the sample at or
out of focus, the beam size at the sample can be
tuned from a couple of microns to several tens of microns.
Unfocused Beam Size (8 keV) Up to 1,000 x 1,000 µm2 FWHM @ 8.3keV
Energy Range 2.5-12 keV (1st harmonic)*
10-25 keV (2nd and 3rd harmonic)
Energy Resolution ΔE/E ~0.2% (bandwidth of LCLS beam)
1.4 x 10-4 (with a Si(111) monochromater)
​Beamline Transmission ​Depends on photon energy, 10% (4 keV) - 40% (8 keV)


Long Pulse Laser System

Technology Frequency Doubled Nd:Glass system
Wavelength 527 nm (1054 nm in principle available)
Pulse Length 2 - 200 ns
Pulse Energy on Target 2 beams of energy depending on pulse length and shape,
typically 3 J for 3 ns and 20 J for 20 ns,
contact MEC staff for details
Repetition Rate 7 minutes (3.5 minutes for one beam interleaved)
​Focusing Capability Flat top spatial profile: 100, 150, 250, 500 µm diameter spot size with
Hybrid Phase Plates
Gaussian spatial profile: 250 and 500 mm focal length lenses

Short Pulse Laser System

Technology Ti:Sapphire CPA laser system
Wavelength 800 nm (400 nm also available)
Pulse Length 40 fs
Pulse Energy on Target at 800 nm 1 J (at 5 Hz), 20 mJ (at 120 Hz)
Repetition Rate 5 Hz
​ASE Contrast ​>108
​Focusing Capability ​depedent on the Parabola in use



X-ray Thomson Scattering
Energy range: 4-8 keV
Crystals: HAPG @ ~30 ev, HOPG @ ~9 ev resolution
Resolution : 4x10-3 at 8 keV for HAPG crystal
Scattering angles: 15 - 90 degrees or fixed
DAQ rate: 1 or 120 Hz
​CSPAD (Cornell-SLAC Pixel
Array Detector) detectors
2-Dimensional pixel array detectors, 110 x 110 µm2 pixel size
Single photon sensitivity, 103 dynamic range at 8.3 keV
120 Hz operation
CSPAD 140K (380 x 380 pixels)
Quad CSPAD (758 x 758 pixels)
XUV spectrometer Wavelength range: 7 - 35 nm
Resolution: 0.08 nm
Collection efficiency: 2.5 10-5 photons
detected per emitted photon in 4
DAQ rate: up to 10 Hz
​Line imaging VISAR ​Temporal window: 1 ns - 1 ms
Temporal resolution: 20 ps
Field of view: 0.5-1 mm
Imaging resolution: 10 µm
FDI Time resolution: 40 fs
Spatial resolution: 10 µm
Chirped operation possible
DAQ rate: up to 10 Hz
Alignment diagnostics Questar long distance microscope
Spatial resolution: 20 µm
Field of view: 0.5-5 mm adjustable
Motorized focus


Characteristic Laser Data





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