PETRA III at DESY
P08 High-Resolution Diffraction

P08 is designed for high resolution diffraction and scattering studies of condensed matter samples. High resolution in this context alludes to real space and simultaneously reciprocal space. In other words, in diffraction geometry crystal lattice parameters can be determined with an accuracy of 10-5 whereas small angle scattering and in some cases reflectometry is sensitive to length scales up to some micrometers, which corresponds to some 10‑4Å‑1. Larger objects can be investigated by tuning the beam spot down to 20x2 µm2 (horizontally x vertically) and rasterizing the sample.

P08 is an undulator beamline, and the beam properties can be adjusted in a wide range by the use of the high heat-load double crystal monochromator (DCM), the large offset monochromator (LOM) and two sets of compound refractive lenses (CRL), one at the optics hutch with 30 m focal length and one in the experimental hutch with 1.5 m focal length. The use of the CRLs determines the four modes at which P08 can run: the raw mode (RM) with unfocused beam, the collimation mode (CM), the focusing mode (FM) using the lenses in the optics hutch only, and the micro-focusing mode (µM). The photon energy can be tuned between 7 and 25 keV with a flux of 1011 to 1012 photons per second, a beam size between 1500x100 µm2 and 20x2 µm2 at an energy resolution of some 10-5. X-ray mirrors are not in use. The suppression of the higher harmonic radiation is realized by the monochromator crystals with an efficiency of 108.

In the experimental hutch two diffractometers are available. A high precision 6-circle diffractometer with Eulerial cradle serves for investigations at hard condensed matter samples. It can fit sample environments of 30kg weight with precision of 0.0005° and wobble of 20µm. It is mainly used for structural investigations and strain/stress determination of thin films, surfaces, and interfaces. Other applications are single crystal diffraction, powder diffraction at complex materials, reflectometry and small angle scattering. User setups can been adapted on request.

For liquid samples the specialized diffractometer LISA, which has been constructed by University of Kiel, is available. It can handle apparatus for liquids, such as Langmuir troughs.

Area detectors are available for the experiments: a Dectris Pilatus-100K pixel detector with 1 mm thick Si-sensor, a large area Perkin Elmer flat-panel detector, a Dectris Eiger-1M pixel detector from University of Kiel, and on request the DESY Lambda pixel detector and a Dectris Pilatus-300k pixel detector.

Beamline Resolving Power
1 * 10-5 [deltaE/E] @ 10000 [eV]
Beamline Energy Range
7000 - 25000 [eV]
Max Flux On Sample
2 * 1012 [ph/s] @ 8 [keV]
Spot Size On Sample Hor
20 - 1500 [um]
Spot Size On Sample Vert
2 - 1000 [um]
Monochromators

FMB Oxford DCM

Type
Si(111) double crystal monochromator

Large Offset Monochromator

Energy Range
5.4 - 29.8 [keV]
Type
Double crystal monochromator creating a vertikal beam offset of 1250 mm.
Four crystal pairs available: Si(311), Si(511), Ge(311), Ge(511)
Other Optics

compound refractive lenses (experimental hutch)

Description
A lens holder for compound beryllium refractive lenses is installed in the experimental hutch approximately 2m from the sample position (6 circle diffractomter) for micro focusing.
Using these lenses a spot size of 30x2 µm can be achieved.

compound refractive lenses (optics hutch)

Description
A lens changer for compound refractive beryllium lenses is installed in the optics hutch roughly in the center between source and sample.

The lenses can be either used for focusing or beam collimation
Endstations or Setup

6 circle diffractometer

Diffractometer
high-precision (6 + 2)-circle diffractometer (Kohzu Precision, Kawasaki, Japan) with Eulerian cradle
Detectors Available
Pilatus 100k
Mythen2
Eiger 1M
NaI point detector
APD

Sample

Sample Type
Crystal, Amorphous, Powder

Manipulator or Sample stage

Degrees Of Freedom
7
Translator Stages
3
Cradles
4
Positioning Precision
X = 0.5 [um], Y = 0.5 [um], Z = 0.5 [um]
Range Of Movement
X = 20 [mm], Y = 20 [mm], Z = 15 [mm]

Sample Environment

Pressure (min)
1 * 10-3 [mbar]
Pressure (Max)
1 [bar]
Temperature
298.15 - 1373.15 [K]

Langmuir film GID setup

Diffractometer
Diffractometer for scattering from liquid interfaces at fixed incident angle
Detectors Available
Mythen2
Endstation Operative
Yes

Sample

Sample Type
Liquid
Mounting Type
langmuir monolayers on langmuir trough

Techniques usage

Diffraction / Surface diffraction
fixed incident GID

Manipulator or Sample stage

Sample Environment

Liquid Scattering Apparatus (LISA)

Diffractometer
Diffractometer for scattering from liquid/gas and liquid/liquid interfaces
Detectors Available
Pilatus 100k
Eiger 1M
Lambda 750k GaAs
Endstation Operative
Yes

Sample

Sample Type
Liquid

Manipulator or Sample stage

Degrees Of Freedom
4
Translator Stages
3
Cradles
1
Detectors

APD

Passive or Active (Electronics)
Active

Detection

Detected Particle
Photon

Eiger 1M

Type
Hybrid Pixel Detector
Pixel Size
X = 75 [um], Y = 75 [um]
Passive or Active (Electronics)
Active

Detection

Detected Particle
Photon

Lambda 750k GaAs

Pixel Size
X = 55 [um], Y = 55 [um]
Passive or Active (Electronics)
Active

Detection

Detected Particle
Photon

Mythen2

Type
Line detector
Pixel Size
X = 50 [um]
Array Size
X = 1280 [pixel]
Passive or Active (Electronics)
Active

Detection

Detected Particle
Photon

NaI point detector

Passive or Active (Electronics)
Active

Detection

Detected Particle
Photon

PerkinElmer XRD 1621

Type
Flat Panel
Pixel Size
X = 200 [um], Y = 200 [um]
Array Size
X = 2048 [pixel], Y = 2048 [pixel]
Passive or Active (Electronics)
Active

Detection

Detected Particle
Photon

Pilatus 100k

Type
Hybrid Pixel Detector
Pixel Size
X = 172 [um], Y = 172 [um]
Thickness
1000 [um]
Passive or Active (Electronics)
Active

Detection

Detected Particle
Photon
contacts
Florian Bertram
Techniques
Diffraction
  • Powder diffraction
  • Surface diffraction
  • Time-resolved studies
Emission or Reflection
  • Reflectrometry
  • Time-resolved studies
Scattering
  • Elastic scattering
  • Small angle scattering
  • Time-resolved scattering
  • Wide angle scattering
control/Data analysis
Control Software Type
  • SPOCK (Sardana), Tango
Data Output Type
  • ascii: Spec-format, Fio-format / Detectors: cbf-format, tiff, nxs, hdf5
Data Output Format
  • ascii, TIF, cbf, nxs, hdf5, Online format fio
Softwares For Data Analysis
  • Python based scripts, matlab, fit2d