Non-scaling fixed field alternating gradient permanent magnet cancer therapy accelerator
AssigneeThe United States of America as represented by the Department of Energy
InventorDejan Trbojevic
Life of this patent
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Abstract
A non-scaling fixed field alternating gradient accelerator includes a racetrack shape including a first straight section connected to a first arc section, the first arc section connected to a second straight section, the second straight section connected to a second arc section, and the second arc section connected to the first straight section; an matching cells configured to match particle orbits between the first straight section, the first arc section, the second straight section, and the second arc section. The accelerator includes the matching cells and an associated matching procedure enabling the particle orbits at varying energies between an arc section and a straight section in the racetrack shape.
Claims17
A non-scaling fixed field alternating gradient accelerator, comprising:
- a racetrack shape comprising a first straight section connected to a first arc section comprising permanent Halbach magnets, the first arc section connected to a second straight section, the second straight section connected to a second arc section comprising permanent Halbach magnets, and the second arc section connected to the first straight section;
- and
- matching cells configured to match particle orbits into one orbit between the first straight section, the first arc section, the second straight section, and the second arc section, wherein the magnets create a permanent magnetic field accepting all proton energies between 31-250 MeV.
A non-scaling fixed field alternating gradient accelerator, comprising:
- a first matching cell connecting a first arc section comprising permanent magnets to a second arc section comprising permanent magnets with an intermediate first straight section, wherein the first matching cell is configured to match particle orbits between the first straight section and the first arc section and between the first straight section and the second arc section;
- and
- a second matching cell connecting the first arc section to the second arc section with an intermediate second straight section, wherein the second matching cell is configured to match particle orbits between the second straight section and the first arc section and between the second straight section and the second arc section, wherein the two arc sections have radii of approximately 2.85 meters.
A method of designing a non-scaling fixed field alternating gradient accelerator as a racetrack, comprising:
- determining stable particle orbits for a ring structure comprising repeating cells;
- breaking the ring structure into two separate arc structures;
- providing two straight sections between the two separate arc structures;
- and
- providing magnets in each of the two straight sections, wherein the magnets are configured to take values of the orbits and betatron amplitude functions and propagate them through a straight section for all proton energies in a range between 31-250 MeV under the fixed magnetic field.
Dependencies are inferred from the claim text.