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An Office of Science User Facility

X-ray Pump Probe (XPP)

This site is OBSOLETE as of 30 Oct. 2017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

 

Specifications

Scientific Capabilities

Scientific Applications Femtosecond Structural Dynamics
X-ray Interactions with Matter
X-ray Techniques Wide Angle X-ray Scattering/Diffraction
Small Angle X-rays Scattering
X-ray Absorption Spectroscopy
X-ray Emission Spectroscopy

 

Source Parameters

Undulator 28 planar hybrid undulators (30 mm gap)
Source Size ~ 40 microns FWHM
Repetition Rate Single pulse, 0.5, 1, 5, 10, 30, 60, 120 Hz
Pulse Duration 80 fs (nominal)
100-200 fs in chirped beam mode
< 20 fs in short pulse mode
Pulse Energy 2 mJ nominal
~ 0.5 mJ in chirped beam mode
0.2 mJ in short pulse mode
Bandwidth ~ 0.1% in nominal and short pulse mode (example spectra)
Up to 1% in chirped beam mode (example spectra)
Harmonic Content ~1% for 3rd Harmonic

 

XPP Photon Beam Properties

Energy Range 4-10 keV (fundamental)
10 - 25 keV (harmonics)
Beam Size ~ 0.5 mm FWHM (unfocused)
Down to 3 x 3 um FWHM focused (Beryllium lenses)
Energy Resolution (ΔE/E) Silicon (111): 1.4 x 10-4
Beamline Control UNIX Workstation, Linux PC, VME-based EPICS control system, Python based control software

 

Optical Laser Properties

Wavelength 800 nm fundamental (nominal)
Harmonic Crystals (400 nm, 266 nm)
OPA (478-590 nm)
Other wavelengths availible upon request
Pulse Energy 10 mJ (800 nm)
1 mJ (400 nm)
0.3 mJ (266 nm)
OPA (> 50 uJ)
Pulse Duration 45 fs FWHM
Up to 5 ps chirped
Timing ~ 200 fs FWHM time resolution
~ 0.5 ps/hr stability
~30-50 fs resolution and drift correction possible using timing diagnostics, application is
dependent on experimental setup. Please discuss with beamline scientists.

 

Detectors

CS-PAD 1520 x 1520 pixels
110 x 110 um2 pixel size
1-2 photon sensitivity at 8 keV
103 per pixel dynamic range at 8 keV
120 Hz readout rate
CS-PAD 140K 388 x 370 pixels
110 x 110 um2 pixel size
single photon sensitivity at 8 keV
103 per pixel dynamic range at 8 keV
120 Hz readout rate
Rayonix MX170-HS 1920 x 1920 pixels
89 x 80​ um2 pixel size
3-4 photon sensitivity at 8 keV
106 per pixel dynamic range at 8 keV
10 Hz readout rate

 

Diagnostics

Relative Intensity Monitor ~0.5% with > 0.2 mJ incident pulse energy

 

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