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TECHNI Report Summary

Project ID: HPRI-CT-1999-50005
Country: Germany

Correction elements for highest resolution in neutron scattering technique

Currently the resolution of neutron spin-echo spectrometers is mainly limited by the ability to achieve very high homogeneity of the magnetic field integrals within a beam, i.e. a bundle of paths. Especially if a large solid angles for sample illumination and in particular also for detection of the scattered neutrons shall be covered. In principle the combined effect of different lengths and variations of magnetic fields from a set of cylindrical coils can be “homogenized” by three correction elements.
The correction elements represent radial current distributions in the neutron beam.

The following milestones have been achieved:
- Finishing to build test stand for the cooling test.

- First prototype can be presented and a series of four test planoconcave FC pieces has been ordered with optimised manufacturing method (splitted backplane).

- Single crystal material has been ordered for the backplate.

- Manufacturing of first prototype of biconcave Fresnel coil underway.

- Simulation of contact finger hints to biconcave Fresnel coils (decrease current).

- Cooling test apparatus has been finished (CCD etc.) - optimising air and water-cooling mechanism for highest current carrying capability

- Simulation of finite thickness Fresnel coils - better simulation of the reality

- Developing of amagnetic highly accurate positioning devices necessary.

Reported by

Forschungszentrum Julich GmbH
Leo-Brandt Str.
52425 Julich
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