XPP Specifications

Femtosecond Structural Dynamics

X-ray Interactions with Matter

Wide Angle X-ray Scattering/Diffraction

Small Angle X-ray Scattering

X-ray Absorption Spectroscopy

X-ray Emission Spectroscopy

28 planar hybrid undulators (30 mm gap)

~ 40 microns FWHM

Single pulse, 0.5, 1, 5, 10, 30, 60, 120 Hz

40 fs (nominal)

100-200 fs in chirped beam mode

< 20 fs in short pulse mode

2 mJ nominal

~ 0.5 mJ in chirped beam mode

0.2 mJ in short pulse mode

~ 0.1% in nominal and short pulse mode (example spectra)

Up to 1% in chirped beam mode (example spectra)

~1% for 3^rd Harmonic

Vertical (from the undulators), horizontal and circular (with a diamond phase retarder)

4-25 keV (fundamental)

10-25 keV (harmonics)

~ 0.5 mm FWHM (unfocused)

Down to 3 x 3 μm FWHM focused (Beryllium lenses)

Main beamline monochromator Silicon (111): 1.4 x 10^-4 , Diamond (111): 0.6 x 10^-4 ,

Postmono(High quality channelcut crystal) Si(440):0.1 x 10^-4, Si(660):0.03 x 10^-4

UNIX Workstation, Linux PC, VME-based EPICS control system, Python based control software

800 nm fundamental (nominal)

Harmonic Crystals (400 nm, 266 nm)

OPA (478-590 nm)

Other wavelengths (Intense THz, Mid-IR) availible upon request

10 mJ (800 nm)

1 mJ (400 nm)

0.3 mJ (266 nm)

OPA (> 50 μJ)

45 fs FWHM

Up to 5 ps chirped

~ 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. 

1470 x 1470 pixels

100 x 100 μm² pixel size

1 photon sensitivity at 8 keV

10⁴ per pixel dynamic range at 8 keV

120 Hz readout rate

388 x 370 pixels

50 x 50 μm² pixel size

single photon sensitivity at 8 keV

10² per pixel dynamic range at 8 keV

120 Hz readout rate

1024 x 1024 (1024 x 512) pixels

75 x 75​ μm² pixel size

1 photon sensitivity at 8 keV

10⁴ per pixel dynamic range at 8 keV

120 Hz readout rate

~0.5% with > 0.2 mJ incident pulse energy