The XPP/KMC-3 is a hard x-ray beamline dedicated to time-resolved x-ray diffraction and absorption spectroscopy experiments (EXAFS, XANES). It is equipped with an x-ray mirror assembly and a double monochromator, which can be removed from the x-ray beam path to allow for experiments with a monochromatic or a white x-ray beam. The energy range extends from 2 keV to 14 keV. In addition, the beamline comprises an ultrafast laser as a pump source for time-resolved experiments. In the near furture, a four-circle diffractometer setup in a vacuum chamber will allow for sample cooling down to 30°K.
Typical applications of the beamline are:
- Time-resolved x-ray diffraction in solids and soft matter
- Debey-Scherrer and Laue diffraction
- Extended X-ray Absorption Fine Structure spectroscopy and X-ray Absorption Near Edge Spectroscopy ( (EXAFS, XANES)
Currently the beamline is only equipped for time-resolved x-ray diffraction experiments. If you wish to submit a proposal please contact the beamline scientist in advance to discuss the feasibility of your experiment.
List of publications
|Energy range||2 - 14 keV|
|Energy resolution||1/5000 - 1/4000|
|Divergence horizontal||-- mrad|
|Divergence vertical||-- mrad|
|Focus size (hor. x vert.)||350 µm x 350 µm|
|Fixed endstation||CryoEXAFS, X-Ray Pump Probe (XPP)|
|User endstation||not possible|
|Distance Focus/last valve||mm|
|Height Focus/floor level||1480 mm mm|
|Phone||+49 30 8062 14695|
Our laser in the Optics Hutch is a multi-stage Yt-doped oscillator - amplifier system (Impulse, Clark-MXR). It is synchronized to the RF-signal of the storage ring with an accuracy better than 5 ps. The main laser parameters are:
- pulse energy = 10 µJ
- pulse duration = 250 fs
- center wavelength = 1030 nm
- repetition rate = 200 kHz - 1.25 MHz (adjustable)
For time-resolved experiments, the laser is coupled to the experimental hutch via a chicane. The optics hutch provides several nonlinear wavelentgh conversion setups, e.g., NOPA, SHG and DFG.