• Experimental station
• Diffractometer
• Sample Environment
• Detectors
• Special Equipment

G3 experimental station

The 4-circle diffractometer with x,y,z-table employs a CCD detector (13 µm pixel size) behind a micro channel collimator for position resolved diffraction of polycrystalline materials [1]. The collimator array suppresses crossfire of radiation scattered from different locations on the specimen thus allowing the position resolved investigation of large areas in a single shot (in contrast to conventional µ-beam techniques). This makes the technique especially suited for dynamic processes like re-crystallization [2]. Further applications include the position resolved determination of composition, strain and orientation (texture) [3, 4].
An additional scintillation detector behind a Soller collimator serves for measurements integrating over the illuminated area and adjustment (definition of regions of interest).

1. T. Wroblewski et al., "A Diffractometer for materials science and imaging at HASYLAB beamline G3", Nucl. Instrum. Meth. A428, 570 (1999)
   
2. T. Wroblewski,"Self organized criticality-a model for recrystallization ?",
   Z. Metallkd.. 93, 1228 (2002)
   
3. W. Wild, W. Reimers, “Residual stress and microstructure in the rail/wheel contact zone of a worn railway wheel”, Mat. Sci. Forum 524-525, 911 (2006)
   
4. W.W. Schmahl, “Investigation of the phase evolution in a super-elastic NiTi shape memory alloy (50.7 at.%Ni) under extensional load with synchrotron radiation”,
   Mat. Sci. Eng. A 378, 81 (2004)