The powder diffractometer E3 is equipped with a position sensitive detector (multicounter). It is installed at the beam tube T2.
The diffractometer is equipped with a curved position sensitive BF3 - multicounter (400 cells) of 2Theta = 80° with a resolution of delta 2Theta = 0.2°, the usable 2Theta range is 3° - 115°. The detector shall be replaced by a new curved position sensitive ³He multicounter (1024 cells) of 2Theta = 80° with a resolution of 2 mm (delta 2Theta = 0.08°).
The 100 mm (in future 150 mm) high detector cells allow the integral measrement of the reflection profile and the detection of weak powder reflections or diffuse scattering contributions. A flexible choice of the wavelength between lambda = 0.9 Å and 3.6 Å is achieved by three vertically focusing monochromators and two fixed take-off angles.
The primary beam and its resolution is defined by a sapphire filter (reducing fast neutron contaminations), a removable graphite filter, two collimators (alpha1 = 10', 30') and the monochromator in use (see table). The local resolution of the measurements can be defined by automatically positioned primary and secondary diaphragms of adjustable geometry. Sample and detector installed on a "Tanzboden" are controlled by a VAX3200 workstation via CAMAC instrumentation.
|Beam Tube for E3:||T2|
| Wavelengths at 2Theta |
|neutron flux|| 2.3*106 n s-1 cm-2 |
(lambda = 2.4 Å, no collimation)
|Collimations|| alpha1 = 10', 30' |
alpha2 = 10', 15', 30'
| maximal beam section |
at sample position:
|60 x 30 mm2|
|Detector|| present: curved position sensitive BF3
in future: Curved position sensitive ³He multicounter
|Channels||400 (in future 1024)|
|Angle Range (2Theta)||3° - 115° (detector width 80°)|
|Auxiliary equipment|| Eulerian cradle with integrated
xyz translation device;
xyz translation device (400 kg);
high T oven (1200°C);
focusing mirror heating device (2000°C);