Massachusetts Institute of Technology

Mevion Medical Systems, Inc.

Stanislaw P Sobczynski

Kenneth P Gall

Gerrit Townsend Zwart

Timothy A Antaya

Alexey L Radovinsky

Jan Van Der Laan

Jun Feng

An example particle accelerator includes a coil to provide a magnetic field to a cavity; a cryostat comprising a chamber for holding the coil, where the coil is arranged in the chamber to define an interior region of the coil and an exterior region of the coil; magnetic structures adjacent to the cryostat, where the magnetic structures have one or more slots at least part-way therethrough; and one or more magnetic shims in one or more corresponding slots. The one or more magnetic shims are movable to adjust a position of the coil by changing a magnetic field produced by the magnetic structures.

Magnetic shims to alter magnetic fields

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.

Compensated precessional beam extraction for cyclotrons

Growing community of inventors

Boxford, MA, United States of America

Stanislaw P Sobczynski