Innovation and Partnerships Office

Left-Right Canted-Cosine-Theta (CCT) Windings for Charged Particle Beam Optics 2014-163

APPLICATIONS OF TECHNOLOGY:

Any application that requires strong alternating fields including

  • Ion beam therapy gantry systems
  • Transportation and focusing of beams with larger momentum spread
  • Synchrotron light sources

ADVANTAGES:

  • Compact design allows efficient alternating of multipole sign (dipole, quadrupole, etc.)
  • Using superconductors, lightweight resulting optics can achieve field strengths not attainable with traditional resistive magnets
  • Compatible with achromatic gantry optics layout for pencil beam scanning

ABSTRACT:

Berkeley Lab scientists and staff Shlomo Caspi, Lucas Brouwer, Weishi Wan, David Robin, Soren Prestemon have developed a compact, effective winding configuration, denoted left-right canted-cosine-theta (LR-CCT) windings, to generate compact alternating multipole coils. The technology overcomes the challenge of efficiently changing multipole field sign for the design of compact charged particle beam optics.

Applied to proton or ion medical therapy gantries, the technology consists of multiple CCT quadrupole winding sections placed in sequence on a curve so the effective current direction is reversed between sections, producing alternating, tunable quadrupole field regions along the bend. The quadrupole focusing fields are superimposed on a dipole bending field, resulting in a very compact beam optics system.

The Berkeley Lab system of compact alternating multipole coils with the use of LR-CCT windings can achieve fields not possible with conventional resistive magnets by reducing the size, weight, and cost of the superconducting gantry systems.

DEVELOPMENT STAGE: A magnet model is being constructed and tested.

STATUS: Patent pending. Available for licensing or collaborative research.

SEE THESE OTHER BERKELEY LAB TECHNOLOGIES IN THIS FIELD:

High Energy Gamma-Ray Imaging and Proton Therapy Dose Verification, 2013-076

Modular, High Precision Collimator, IB-2883

REFERENCE NUMBER: 2014-163