V1

Membrane Diffractometer

 

Instrument description

The design of the instrument is dedicated for biological samples or other samples with large unit cells (5 -10 nm in cell length). The vertically focusing graphite monochromator provides adjustable wavelengths between 0.4 nm and 0.6 nm, making use of the full cross section of the neutron guide (3 cm wide, 12.5 cm high). A movable Be-filter at liquid nitrogen temperature may be used to suppress second order wavelengths below 0.39 nm. If less stringent collimation conditions allow, high flux at short monochromator - sample distances (approx. 80 cm) are made possible by a compact construction of shieldings. Sample and detector supports are movable on aircushions. The maximum Q value in all configurations with Be-Filter is limited to 22 nm-1.

Applications

The instrument is designed for experiments with biological membranes, polymers, microemulsions, micelles and other partly oriented systems. The high spatial resolution of the detector is appropriate for studying reflections from biological single crystals and magnetic satellite reflections.

Selected examples

Interaction of β-amyloid with lipid membranes

 



Liste von Publikationen
Instrument Data
Beam tube NL 1A
Collimation α0 = 1° at 0.45 nm (resulting from the 58Ni-neutron guide)
α1: defined by two slit systems
Monochromator PG (002), vertically focusing
Take off angle of monochromator M = 60°-120° (not alterable during experiment)
Wave length λ = 0.4-0.6 nm
Flux 1 x 107 n/(cm2 s)
Range of scattering angles -10° < 2Θ > 120°
Angle resolution
Range of lattice spacing
d resolution
Sample size
Detector 3He, 19 x 19 cm2
pixel size 1.5 x 1.5 mm2
height and inclination adjustable
Polarized neutrons no
Instrument options
Sample environment Special sample containers with humidity and temperature control
Software CARESS with special features for area detector and powder diffraction data evaluation
Monochromator/sample distance 0.8 m - 1.5 m (extendable)
sample-to-detector distance 0.8 m - 2.0 m, 1.0 m standard