KWS 2 High Intensity / Wide-Q
Small Angle Neutron Diffractometer

- the flux at sample position:

- monochromatization: Astrium velocity selector, Δλ/λ=0.2

- the Q-range (pinhole mode): 0.0007 - 0.5 Å^-1

- the actual Qmax: 0.5Å^-1

- the available Q-range for different configurations:

- sample environments:

- the main detector: based on the Anger principle; consists of an array of 8 x 8 photomultipliers, a 60 cm x 60 cm 6Li glass scintillator and a light disperser glass; space resolution 5.25mm

Source ZEL, Forschungszentrum Jülich

- actual dead-time (150kHz for 10% dead-time):

- variable size beam-stop with monitor in center for measuring the transmission simultaneously with the SANS measurement

Source: ZAT, Forschungszentrum Jülich

- high resolution (second) detector (0.5mm): to be installed in January 2012

- double-disc chopper (max. 200Hz) with variable opening: in commissioning

- MgF₂ aspherical lenses: in commissioning

- Full Q-range at KWS-2 (lenses & standard pinhole)

- example of 2D rawdata measured at KWS-2:

- example of 2D data corrected for the detector sensitivity:

- absolute calibration: Plexiglas standard sample

- software for data correction, calibration, radial average and fit: qtiKWS for Windows and Linux