Magnet Structure For An Isochronous Superconducting Compact Cyclotron
AssigneeIon Beam Applications S.A.
InventorYves Jongen
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Abstract
The invention relates to a magnet structure for a superconducting isochronous cyclotron for use in particle therapy. The cyclotron according to the invention is using two sets of three or more superconducting sector coil elements for generating an azimuthally varying magnetic field across the acceleration region. In this way, high-field (e.g. above 4 T) isochronous cyclotrons are provided which do not suffer the problem of a low flutter amplitude.
Claims25
A magnet structure for an isochronous compact cyclotron for generating a magnetic field across an acceleration region and whereby said magnetic field is perpendicular to a median plane of said acceleration region, said magnet structure comprising:
- a superconducting coil assembly,
- a ferro-magnetic assembly for guiding a magnetic flux, and
- a cavity forming said acceleration region,
- wherein
- said superconducting coil assembly comprises a series of three or more superconducting sector coil elements located on top and below said acceleration region, each sector coil element having legs for leading a current in different directions, said sector coil elements being configured for varying azimuthally said magnetic field between a lower magnetic field value and a higher magnetic field value, and
- said ferro-magnetic assembly comprises magnetically interconnected portions for guiding a magnetic flux from each of said sector coil elements.
A magnet structure for an isochronous compact cyclotron for accelerating charged particles, configured for generating a magnetic field across an acceleration region, said magnetic field being perpendicular to a median plane of said acceleration region,
- said magnetic structure is comprising a series of three or more superconducting sector coil elements located on top and below said acceleration region, each sector coil element having legs for leading a current in different directions, said sector coil elements being configured for varying azimuthally said magnetic field between a lower magnetic field value and a higher magnetic field value and each of said sector coil elements has an outbound leg for leading a current in an outwards direction out of said acceleration region, an inbound leg for leading a current in an inwards direction in said acceleration region, and an external return leg at the periphery of said acceleration region for leading a current from said outbound leg to said inbound leg,
- wherein an internal return leg is provided for leading a current from a said inbound leg to an outbound leg of an adjacent sector coil element, the sector coil elements thereby forming a clover-leaf shaped closed coil below and on top of said acceleration region.
Dependencies are inferred from the claim text.