The multimodal XAS-XRD endstation at Balder allows for simultanous measurements of XAS and XRD for in-situ / in-operando investigations. It adds a 2D EIGER 1M detector, which is mounted on a robot arm for flexible positioning, to the experimental setup.

Schematic representation of the combined XAS-XRD setup at Balder.

Data aquisition is currently implemented in sequential mode: XRD-XAS-XRD-XAS… This allows to freely choose the energy of XRD acquisition (within a window of ~3keV from the XAS energy range. The overall achieved time resolution for combined measurements is dominated by XAS acquisition and currently reaches down to approx. 20s. The q-range and resolution can be varied taking advantage of the flexibility in positioning the detector. However, measurements are performed with a stationary detector, with fixed q-range.

Sequential mode XAS-XRD data acquisition

Example in-situ XRD data can be found here.

Diffraction rings obtained from LaB6 with 1s exposure time.

In the current state, the XRD system is given in raw data mode. Users have to be able to perform calibration, azimuthal integration and full data analysis.

Please contact the beamline staff prior to submission, if you intent to use complementary XRD in your proposal!

Forseeable Upgrades

  • We are currently implementing a new motion control and data acquisition scheme for combined XAS-XRD measurements allowing for combined time resolutions down to sub-seconds.
  • A live view data reduction and azimuthal integration pipeline is currently developed
  • We will offer soon a parallel data acquisition scheme to achieve ms time resolution for XRD