About this blogDiffraction is a technique to determine the atomic structure of materials very accurately. Most scientists use X-ray diffraction (XRD) for this, but hydrogen and neighbours in the periodic table of Mendeleev are sometimes hard to find or distinguish. Neutron diffraction can do precisely that! Moreover, magnetic structures can be revealed and atoms can be highlighted or masked by isotope substitution.
Since neutrons are difficult to generate, such a diffractometer is not avaible within 500km, so the Reactor Institute Delft (TU Delft) has taken up the initiative to provide such an instrument to Dutch users.
This blog is about the progress of the design and building of PEARL: the Dutch neutron (powder) diffractometer.
Tagsbeamline chemistry components crystals cu design detector detector diffraction first production drawings design ge germanium monochromator neutron diffraction ill isis location national facility neutron neutron diffraction diffractometer ready 2013 npm2 physics planning project reactor reflectometer report ranking instruments Oyster RID Netherlands neutron users rog rrr sapphire PEARL diffractometer neutron fast-neutrons gammas scattering scintillator shopping team tests tnw tudelft
Search in PEARL news
- TOF diffraction in reciprocal space - 19,135 views
- Institute colloquium on 12/May/2011 15h - 17,421 views
- Placement of neutron diffractometer - 16,315 views
- testing detectors… - 15,831 views
- First components are in. - 15,542 views
- first attempts in the mechanical design detector - 14,426 views
- Institute wide co-operation for the development project - 14,263 views
- radiation shielding progress - 14,028 views
- Shopping components - 14,022 views
- NICE results detector tests!! - 13,994 views
Tag Archives: reactor
The constant wavelength (CW) neutron diffractometer can be placed on one of two locations that are available at the reactor. Although one has a 20% higher thermal flux, the instrument would be better accessible at the other beam line. This practicality makes the daily operation easier, but also the installation of the (heavy) shielding at the beginning.
In Ruud’s drawing above: The (yellow) beam travels from the core to the (red) focussing monochromator which reflects 1.7AA neutrons to the (blue) sample. The scattered neutrons from the sample are counted by the (green) banana-shaped detector that is centered on the sample. The environment around the instrument is shielded from the gamma and neutron radiation by thick (grey semi-transparent) walls.