V16

Very Small Angle Neutron Scattering (VSANS)

Instrument description

The second SANS instrument at BER II is dedicated to soft matter research. V16 covers a Q-range from 10-3 nm^-1 to 8.5 nm^-1. In standard time-of-flight mode an offset of the detector to the instrument axis to extend the Q range will be possible.

The instrument works in the time-of-flight mode with ordinary pinhole collimation and in an optional high resolution mode using multi pinhole grid collimation. The latter mode will allow for gravitational velocity selection and focuses many beams on a high resolution detector, only used for this option.

Applications

Selected examples

Instrument layout

V16 instrument overview

Instrument Data
Neutron guide	NL 4C straight behind bender, SM coated, m=1 cross section 80x80 cm² with cut-off λ=0.35 nm
Collimation	exchangeable pinhole and guide optics on up to 12m length
Monochromator	TOF
Wave length	0.35 nm < λ < 3 nm
Wave length resolution
Flux
Q range	0.01 nm ^-1 < Q < 8.5 nm ^-1
Q resolution	5% < ΔQ/Q < 18%
Detector	2D ³He detector • 60x60 cm² area • physical pitch: 5..7 mm
Sample-to-detector distance	1m up to 12m
Polarized neutrons	not yet
Instrument options	• High-resolution mode (see specifics below)
Sample environment	Hellma cuvettes (120, 404), cryostats and magnets from sample environment group, Rheometer (later in 2012)
Software	Caress (control), Evalstat (in-house DAQ), Mantid (data reduction)
High resolution mode
Neutron guide	NL 4C straight behind bender, SM coated, m=1 cross section 80x80 cm² with cut-off λ=0.35 nm
Collimation	multi pinhole-grids, on 12m length
Monochromator	gravitational velocity selection through multi pinhole-grids
Wave length	0.35 nm < λ < 3 nm
Wave length resolution
Flux
Q range	0.001 nm ^-1 < Q < 8.5 nm ^-1
Q resolution
Detector	2D detector with 2x2 mm² pitch
Sample-to-detector distance
Polarized neutrons
Instrument options
Sample environment
Software