XPP Specifications
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-ray 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 μm 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 μJ) | |
| 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 μm2 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 μm2 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 μm2 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 |
|---|
XPP Links
XPP Contact Info
Sebastien Boutet
Department Head
(650) 926-8676
sboutet@slac.stanford.edu
Diling Zhu
Scientist
(650) 926-2913
dlzhu@slac.stanford.edu
Roberto Alonso-Mori
Scientist
(650) 926-4179
robertoa@slac.stanford.edu
Matthieu Chollet
Scientist
(650) 926-2458
mchollet@slac.stanford.edu
Takahiro Sato
Scientist
(650) 926-3749
takahiro@slac.stanford.edu
Sanghoon Song
Scientist
(650) 926-2255
sanghoon@slac.stanford.edu
Daniel Stefanescu
XPP Area Manager
(650) 926-3662
daniel@slac.stanford.edu
Control Room: (650) 926-1703
XPP Hutch: (650) 926-7463
XPP Location
Near Experimental Hall (NEH), Hutch 3
Complete Instrument Map
