Abstract

The Loq small angle neutron scattering (SANS) instrument at ISIS target station one (TS1) has proved an extremely popular and immensely productive SANS facility over the last 20 years. Loq is routinely operated with a 25 Hz disc chopper removing alternate neutron pulses from the 50 Hz source to provide a usable wavelength range of 2.2 to 10 Å. Scattered neutrons are recorded on a 0.64 m square 3He multiwire proportional counter (Ordela 2661N) fixed at ∼ 4 m from the sample, with a total flight path of 15 m from the decoupled liquid hydrogen moderator [1].

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