Linac Coherent Light Source

MEC Specifications

Specifications

Instruments

MEC Source Parameters

Photon Energy 2.5-25 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)
Focusing Capability Lens stacks appropriate to given photon energy. Tuned from a couple of microns to several tens of microns by moving target out of focus.
Unfocused Beam Size (8 keV) Up to 1,000 x 1,000 µm2 FWHM @ 8.3 keV
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)

* Energies below 4 keV are in principle usable but the beam size at the end station is large leading to reduced flux. Fundamental goes to 25 keV and both fundamental and harmonics are cut off by the HOMS transport mirrors common to all hard X-ray instruments.

Long Pulse Laser System

Technology Frequency Doubled Nd:Glass system
Wavelength 527 nm
Pulse Length 5 - 35 ns ("best effort" for pulse duration down to 2 ns)
Pulse Energy on Target 4 arms polarization multiplexed into two beams with energy depending on pulse length and shape: each arm up to 15 J at 527 nm in 10 ns square pulse. Contact MEC staff for details.
Repetition Rate 7 minutes (3.5 minutes for one beam interleaved; pulse shaping quality may be reduced)
​Focusing Capability
  • Flat top spatial profile: 150, 300, and 600 µm diameter spot size with Continuous Phase Plates
  • Direct focus: 250 mm focal length aspheric 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), 10 mJ (at 120 Hz)
Repetition Rate 5 Hz
​ASE Contrast ​​>108
​Focusing Capability

​f/6 OAP in standard delivery, <10 µm FWHM focus;

Other OAP focal lengths available for non-standard beam delivery

More Laser Details »

Diagnostics

X-ray Thomson Scattering 
Spectrometers
  • Energy range: 4-25 keV
  • Crystals: HAPG @ ~30 eV, HOPG @ ~9 eV resolution
  • Resolution : 4 x 10-3 at 8 keV for HAPG crystal
  • Scattering angles: 15 - 90 degrees or fixed
  • DAQ rate: up to 120 Hz

Pixel Array Detectors (updating)
  • 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 4π
  • DAQ rate: up to 0.2 Hz (with 1 MHz controller)
  • Detector: PI-MTE 2048B
​Line imaging VISAR
  • Dual camera to remove phase ambiguity
  • Temporal window: 1 ns - 1 ms
  • Temporal resolution: 20 ps
  • Field of view: 0.265 mm at the streak cameras
  • Imaging resolution: 10 µm
  • 0.1 Hz
X-ray Transmission Crystal Spectrometer
  • Energy range at high resolution of about 1.5 keV at central photon energy in range: 6-21 keV
  • Energy range of low resolution mode: 20-200 keV
  • Crystals: Quartz (101) plan for low resolution and assymetric cut (203) for high resolution
  • Resolving power: 3 x 10-4 at 8 keV
  • Fully shielded with 12 mm of tungsten
  • DAQ rate: up to 120 Hz
Alignment diagnostics
  • Questar long distance microscopes
  • Spatial resolution: 20 µm
  • Field of view: 0.5-5 mm adjustable
  • Motorized focus

MEC Links

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MEC Contact Info

Eric Galtier

Scientist (Instrument Lead)
(650) 926-6227
egaltier@slac.stanford.edu

Jonathan Ehni

Area Manager
(650) 926-4562
jonehni@slac.stanford.edu

Dimitri Khaghani

Scientist (Instrument)
(650) 926-5009
khaghani@slac.stanford.edu

Hae Ja Lee

Scientist (Instrument)
(650) 926-2049
haelee@slac.stanford.edu

Bob Nagler

Scientist (Instrument)
(650) 926-3810
bnagler@slac.stanford.edu

Philip Heimann

Scientist (Instrument, X-ray Beam Delivery)
(650) 926-8772
paheim@slac.stanford.edu

Eric Cunningham

Scientist (Lasers)
(650) 926-2548
efcunn@slac.stanford.edu

Hai-En Tsai

Project Scientist (Lasers)
(650) 926-5092
haien@slac.stanford.edu

Marc Welch

Engineer (Lasers)
(650) 926-3754
mwelch@slac.stanford.edu

Gilliss Dyer

Scientist (MEC Dept Head)
(650) 926-3414
gilliss@slac.stanford.edu

Control Room: (650) 926-7970
MEC Hutch: (650) 926-7974
Vestibule: (650) 926-7976

MEC Location

MEC Location

Far Experimental Hall (FEH), Hutch 6

LCLS Instrument Map

Complete Instrument Map

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