Compensated precessional beam extraction for cyclotrons
AssigneeMassachusetts Institute of Technology
InventorsTimothy A. Antaya, Jun Feng, Alexey Radovinsky, Stanislaw P. Sobczynski
Life of this patent
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Abstract
A plurality of magnetic extraction bumps are incorporated into a cyclotron that further includes (a) a pair of magnetic coils encircling a central axis and positioned on opposite sides of a median acceleration plane and (b) a magnetic yoke encircling the central axis and including a return yoke that crosses the median acceleration plane and a first and second pole on opposite sides of the median acceleration plane. The magnetic extraction bumps extend in series radially from the central axis on opposite sides of the median acceleration plane and can be used to extract an orbiting accelerated ion from the cyclotron.
Claims20
A cyclotron comprising:
- a pair of magnetic coils encircling a central axis and positioned on opposite sides of a median acceleration plane;
- a magnetic yoke encircling the central axis and including a return yoke that crosses the median acceleration plane and a first and second pole on opposite sides of the median acceleration plane;
- and
- a series of magnetic extraction bumps extending in series from the central axis on opposite sides of the median acceleration plane, wherein the extraction bumps are positioned non-axially symmetrically across distinct radial distances from the central axis and separated from each other by radial gaps such that the extraction bumps are configured to displace an ion that is accelerating through the median acceleration plane in an outwardly expanding orbit about the central axis out of its orbit and out of the cyclotron.
A method for ion extraction from a cyclotron, the method comprising:
- releasing an ion into an acceleration chamber contained in the cyclotron;
- accelerating the ion in an outward spiral orbit in the acceleration chamber;
- and
- extracting the accelerated ion from the acceleration chamber via a magnetic-field perturbation produced by a series of magnetic extraction bumps separated across distinct radial distances from the central axis and positioned orthogonal to the orbit of the accelerating ion such that the magnetic-field perturbation produced by the magnetic extraction bumps destabilizes the orbit of the accelerating ion.
Dependencies are inferred from the claim text.