PETRA III at DESY
P09 Resonant Scattering and Diffraction

Beamline P09 operates at X-ray energies between from 2.7 to 31 keV .  It is dedicated to resonant X-ray scattering and general diffraction experiments on single-crystals and thin films. A double phase retarder and a polarization analyzer are available in order to control the polarisation of the incoming beam and analyze the polarization of the scattered beam in the energy range between 2.7 and 13.7 keV. Fast switching of the incident circular polarization is also possible allowing for circular dichroic experiments. The supported techniques are single-crystal diffraction, resonant and non resonant X-ray scattering (REXS, magnetic diffraction), diffraction anomalous fine structure (DAFS), X-ray resonant magnetic reflectivity (XRMR)   and X-ray magnetic circular dichroism (XMCD). The diversity of sample environments available at the beamline allow for experiments in a wide range of temperature to take place, in high magnetic fields, at high pressure and in electric fields.

Experimental Hutch 1 is equipped with a high-precision ‘4S + 2D’ six-circle diffractometer allowing for experiments in the horizontal and vertical scattering planes with small sample environments of weight loads till 15 kg. Closed-cycle cryostats covering the temperature range between 1.7K and 800K and a He-flow cryostat are available. Windowless operation  is possible for experiments in the tender X-ray range. A 4 coils electromagnet allows for XRMR+XMCD experiments till 0.4 T at low temperatures.

Experimental hutch 2 is equipped with a non-magnetic heavy-load six-circle diffractometer in horizontal Psi-geometry allowing for experiments in the horizontal scattering plane with heavy sample environment till 800 kg. A 14 Tesla split-coil cryomagnet is available operating in the temperature range from 1.8 K up to 300 K with the variable temperature insert or down to 320 mK using the He-3 insert. A pulse tube cryostat with large cooling power is also available allowing high pressure experiments with DACs down to 4 K (P < 30 GPa). A 6/2/2 T vector magnet and a 1 T electromagnet allows for XMCD experiments at low temperatures.

Experimental hutch 3 is open port as of September 3rd, 2018.

Beamline Energy Resolution
1 * 10-4 [meV] @ 10 [eV]
Beamline Energy Range
2700 - 50000 [eV]
Max Flux On Sample
2 * 1013 [ph/s] @ 8 [eV]
Spot Size On Sample Hor
50 - 2000 [um]
Spot Size On Sample Vert
4 - 1500 [um]
Photon Sources

PETRA III - Spectroscopy Undulator

Type
Undulator
Available Polarization
Linear horizontal
Source Divergence Sigma
X = 8 [urad], Y = 4 [urad]
Source Size Sigma
X = 142 [um], Y = 5 [um]
Energy Range
2.7 - 50 [keV]
Monochromators

Fixed-exit Double-Crystal-Monochromator

Energy Range
2700 - 50000 [eV]
Type
Si111 / Si311
Resolving Power
1.3 * 10-4 [deltaE/E]
Grating Type
No grating
Pre-focusing Mirror Type
No
Refocusing Mirror Type
No
Other Optics

Double Phase Retarder

Description
Circular and rotated linear polarization can be obtained using quarter-wave plates (QWPs) and half-wave plates (HWPs) at P09. Diamond and Silicium phase-plates are available allowing for variable polarization between 2.7 and 13 keV. A piezo-actuator below the plates allows oscillation with frequencies of up to 40 Hz for fast switching the helicity of circular polarization.

Focusing Mirrors

Description
Beamline P09 is equipped with two 1 m-long and 130 mm-wide fused silica mirrors for the purpose of harmonic suppression and focusing.
The first mirror deflects vertically, the second vertically down to preserve a parallel beam.
The first mirror has two cylinders with sagittal radii of curvature of r1 = 88 mm and a flat section in between, half of which is coated with 40 nm Pd.
The second mirror has one cylinder with a sagittal radius of curvature r2= 167 mm and two flat sections at the side, with one of them coated with Pd.
In addition, the second mirror is equipped with a bender for vertical focusing.
By combining different trays and choosing different glancing angles, energy cut-offs are:
-- 5.7, 11.5 and 24 keV in the 1st experimental hutch yielding a beam size, for instance, of ~145 x 45 um^2 at 8 keV [vs. 2 x 1.4 mm^2 (unfocused)]]
-- 7.4, 14.3 and 31 keV in the 2nd experimental hutch yielding a beam size, for instance, of ~200 x 70 um^2 at 8 keV (focused) [vs. 1.7 x 1.2 mm^2 (unfocused)]
Detectors

Avalanche Photo Diode

Type
Point Detector
Passive or Active (Electronics)
Active

Detection

Detected Particle
Electron

Energy Dispersive Vortex EX30

Type
Energy Dispersive Fluorescence Detector
Passive or Active (Electronics)
Active

Detection

Detected Particle
Electron

NaI Scintillator

Type
Point Detector
Passive or Active (Electronics)
Active

Detection

Detected Particle
Electron

Pilatus 300K

Type
2D detector
Passive or Active (Electronics)
Active

Detection

Detected Particle
Electron
contacts
Sonia Francoual
Techniques
Absorption
  • XMCD
Diffraction
  • Crystallography
  • Surface diffraction
Scattering
  • Elastic scattering
  • Magnetic scattering
Disciplines
Material Sciences
  • Other - Material Sciences
Address
Beamline P09 at PETRA III
Deutsches Elektronen-Synchrotron
Max von Laue Hall / Geb 47c EG Sektor 6
Notkestra├če 85
22607 Hamburg
Germany
control/Data analysis
Control Software Type
  • SPOCK (Sardana), Tango
Data Output Type
  • ascii: Spec-format
    Pilatus: cbf-format
Data Output Format
  • ascii, cbf
Softwares For Data Analysis
  • in-house: iint