Abstract
This work is related to neutron detection in the context of the polarised neutron optics technique of spatial magnetic spin resonance. By this technique neutron beams may be tailored in their spectral distribution and temporal structure. We have performed experiments with very cold neutrons (VCN) at the high-flux research reactor of the Institut Laue Langevin (ILL) in Grenoble to demonstrate the potential of this method. A combination of spatially and temporally resolving neutron detection allowed us to characterize a prototype neutron resonator. With this detector we were able to record neutron time-of-flight spectra, assess and minimise neutron background and provide for normalisation of the spectra owing to variations in reactor power and ambient conditions at the same time.
Highlights
Polariser, resonator, broadband spinflipper and analyser will act as a monochromator for polarised neutron beams which may be pulsed with an appropriate operation mode of the resonator
In recent years we have developed resonators with independent elements which allow us to tailor the neutron beam with high flexibility
First experiments were performed at a dichromatic thermal neutron beam at the TRIGA reactor of the Atominstitut in Vienna [7,8]
Summary
Polariser, resonator, broadband spinflipper and analyser will act as a monochromator for polarised neutron beams which may be pulsed with an appropriate operation mode of the resonator. In recent years we have developed resonators with independent elements which allow us to tailor the neutron beam with high flexibility. First experiments were performed at a dichromatic thermal neutron beam at the TRIGA reactor of the Atominstitut in Vienna [7,8]. First experiments at a polychromatic white neutron beam were performed recently with very cold neutrons (VCN) at the instrument PF2/VCN at ILL. These slow neutrons are ideal for tests with relaxed conditions on resonator field strength and resonator timing
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