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US 10,278,277 B2Granted
Gradient corrector for cyclotron
AssigneeIon Beam Applications S.A.
InventorsWillem Kleeven, Szymon Zaremba
Life of this patent
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Abstract
The present disclosure relates to a magnet pole for an isochronous sector-focused cyclotron having hill and valley sectors alternatively distributed around a central axis, Z, each hill sector having an upper surface bounded by four edges: an upper peripheral edge, an upper central edge, a first and a second upper lateral edges, and a peripheral surface extending from the upper peripheral edge to a lower peripheral line. The upper peripheral edge of at least one hill sector may further include a concave portion with respect to the central axis defining a recess extending at least partially over a portion of the peripheral surface of the corresponding hill sector.
Claims20
A magnet pole for use in a cyclotron, comprising:
- at least three hill sectors, each associated with a magnetic field;
- and
- a same number of valley sectors comprising a bottom surface, where each valley sector is associated with a magnetic field, where the magnetic fields of the hill sectors are stronger than the magnetic fields of the valley sectors,
- said hill sectors and valley sectors being alternatively distributed around a central axis, and
- each hill sector comprising:
- an upper surface defined by:
- an upper peripheral edge, said upper peripheral edge being bounded by a first and a second upper distal ends, and being defined as the edge of the upper surface located furthest from the central axis,
- an upper central edge, said upper central edge being bounded by a first and a second upper proximal ends and being defined as the edge of the upper surface located closest from the central axis,
- a first upper lateral edge connecting the first upper distal end and first upper proximal end, and
- a second upper lateral edge connecting the second upper distal end and second upper proximal end;
- a first lateral surface and a second lateral surface, each extending transversally from the first and second upper lateral edges to the bottom surfaces of corresponding valley sectors located on either sides of a hill sector, thus defining a first and second lower lateral edges as the edges intersecting a lateral surface with an adjacent bottom surface, said first and second lower lateral edges each having a lower distal end located furthest from the central axis;
- and
- a peripheral surface extending from the upper peripheral edge to a lower peripheral line defined as the segment bounded by the lower distal ends of the first and second lower lateral edges,
- wherein the upper peripheral edge of at least one hill sector comprises a concave portion with respect to the central axis defining a recess extending at least partially over a portion of the peripheral surface of a corresponding hill sector.
11 more elements
A cyclotron for accelerating a particle beam over a given path within a gap, the cyclotron comprising:
- a first magnet pole and a second magnetic pole, wherein at least one of the first and second magnetic poles comprises:
- at least three hill sectors, each associated with a magnetic field;
- and
- a same number of valley sectors comprising a bottom surface, where each valley sector is associated with a magnetic field, where the magnetic fields of the hill sectors are stronger than the magnetic fields of the valley sectors,
- said hill sectors and valley sectors being alternatively distributed around a first central axis, and
- each hill sector comprising:
- an upper surface defined by an upper peripheral edge bounded by a first and a second upper distal ends and being defined as the edge of the upper surface located furthest from the first central axis, an upper central edge bounded by a first and a second upper proximal ends and being defined as the edge of the upper surface located closest from the first central axis, a first upper lateral edge connecting the first upper distal end and first upper proximal end, and a second upper lateral edge connecting the second upper distal end and second upper proximal end;
- a first lateral surface and a second lateral surface, each extending transversally from the first and second upper lateral edges to the bottom surfaces of corresponding valley sectors located on either sides of a hill sector, thus defining a first and second lower lateral edges as the edges intersecting a lateral surface with an adjacent bottom surface, said first and second lower lateral edges each having a lower distal end located furthest from the first central axis;
- and
- a peripheral surface extending from the upper peripheral edge to a lower peripheral line defined as the segment bounded by the lower distal ends of the first and second lower lateral edges,
- wherein the upper peripheral edge of at least one hill sector comprises a concave portion with respect to the first central axis defining a first recess extending at least partially over a portion of the peripheral surface of a corresponding hill sector.
8 more elements
Dependencies are inferred from the claim text.