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Magnetism

The "Projects and Calculations" labs (BPC) has two main roles : achievement of innovative projects and carrying out complex calculations in many physical fields for all ILL divisions.

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Magnetism

The BPC provides magnetic field and magnetic gradient mapping services for various applications (instrument design...).

 

Magic Box Design

The first example given here shows results obtained from the study of a Magic Box and is part of the more general feasibility study for the draft CRYOPAD IV project. The Magic Box concept has already been used numerous times at the ILL, but never where its length is 10 times superior to its height. The study has shown that it is possible to use such a large Magic Box with high homogeneity.

Magic Pastis Project

The second example shows results obtained for the Magic Pastis project. Magic Pastis full optimization was carried out for the X, Y and Z directions with a homogeneity of around 1.10-3 cm-1.

Magnetic field calculation for a 120° coil on IN20/IN22

In the picture below we show the Bx component of the magnetic field created by the grey coil at 120°. The x direction is normal to the plane crossing the coil frame. The whole experimental set-up has 3 coils at 120°. It is possible, by changing the coil's inner current, to adjust the magnetic field direction in the equatorial plane.

Magnetic field mapping of monochromator blades

The monochromator is considered from the magnotostatic point of view as two permanent magnets in an iron U. For reasons of symmetry, only one half of the U and the upper magnet have been modeled.

The monochromator blades are set up in the magnets' air gap. As the blades are Heusler crystals, they are magnetised by the magnetic field created by the magnets. The blade field map helps to estimate the neutron beam depolarisation on the blades.

 

 

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