Speaker
Description
TOFTOF is a direct geometry disc-chopper timeof-
flight spectrometer located in the Neutron Guide
Hall West. It is suitable for both inelastic and quasielastic
neutron scattering and the scientific questions
addressed range from the dynamics in disordered
materials in hard and soft condensed matter
systems (such as polymer melts, glasses, molecular
liquids, or liquid metal alloys), properties of new
hydrogen storage materials to low-energy magnetic
excitations in multiferroic compounds, and molecular
magnets.
A cascade of seven fast rotating disc choppers
which are housed in four chopper vessels is used
to prepare a monochromatic pulsed beam which is
focussed onto the sample by a converging supermirror
section. The scattered neutrons are detected
by 1000 3He detector tubes with a time resolution up
to 50 ns. The detectors are mounted at a distance of
4 m and cover 12 m2 (or 0.75 sr). The high rotation
speed of the chopper system (up to 22 000 rpm)
together with a high neutron flux in the wavelength
range of 1.4 -14 Å allows free tuning of the energy
resolution between 3 meV and 2 μeV.
