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An Office of Science User Facility

Matter in Extreme Conditions (MEC)



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