Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Cédric Hugon

Guy Aubert

Dimitrios Sakellariou

The cylindrical permanent magnet device includes at least one basic structure () having a longitudinal axis (z) and a set () of coaxial magnetized structures () that are in the form of non-contiguous rings of axis that is the longitudinal axis (z) and that are disposed on the same side of the basic structure (), defining an exterior surface perpendicular to the longitudinal axis (z) to produce a magnetic field (B) outside the magnet device in an exterior area of interest () situated at a predetermined distance from the exterior surface along the longitudinal axis (z). At least one of the coaxial magnetized structures () in the form of rings is divided into components in the form of non-contiguous identical sectors. The basic structure () and the set () of coaxial magnetized structures () in the form of rings are magnetized in the same direction (M) to create in the exterior area of interest () an induced magnetic field (B) that is homogeneous or that has a constant gradient and that is oriented at a predetermined angle (&#x3b8;) relative to the longitudinal axis (z).

Cylindrical permanent magnet device generating a controlled magnetic field at a distance from the surface thereof

A magnetized structure that induces in a central area of interest a homogeneous magnetic field of predetermined orientation relative to a longitudinal axis (z) of the structure comprises at least two magnetized rings () disposed symmetrically relative to a plane (P) that is perpendicular to the longitudinal axis (z) and that contains the central area of interest, and at least one median annular magnetized structure disposed at least partly between the two magnetized rings () and also disposed symmetrically relative to the plane (P) of symmetry, one of the two magnetized rings () being magnetized radially relative to the longitudinal axis (z) with divergent magnetization and the other of the two magnetized rings () being magnetized radially relative to the longitudinal axis (z) with convergent magnetization, and the median annular magnetized structure being magnetized with an orientation different from that of the magnetization of the two magnetized rings (). The median annular magnetized structure comprises at least one magnetized ring () having a magnetization distribution of orientation that varies as in Halbach dipoles and the first two magnetized rings () and the median annular magnetized structure are each divided into individual components in the form of regularly distributed identical sectors.

Magnetised structure inducing a homogeneous field, in the centre thereof, with a pre-determined orientation

The magnetized structure that induces in a central area of interest a homogeneous magnetic field oriented along a longitudinal axis (z) of the structure comprises first and second magnetized rings () disposed symmetrically relative to a plane (P) that is perpendicular to said longitudinal axis (z) and that contains said central area of interest, and one median annular magnetized structure () disposed between the first and second magnetized rings () and also disposed symmetrically relative to the plane (P) of symmetry. The first magnetized ring () is magnetized radially relative to the longitudinal axis (z) with divergent magnetization, the second magnetized ring () is magnetized radially relative to the longitudinal axis (z) with convergent magnetization, and the median annular magnetized structure () is magnetized along the longitudinal axis (z). The median annular magnetized structure () is divided into at least two slices (A,B,A,B) along the longitudinal axis (z) and the first and second magnetized rings () and the various slices (A,B,A,B) of the median magnetized structure () are each divided into identical components in the form of regularly distributed sectors.

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Clamart, France

Cédric Hugon