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TUYB01 |
Vertical Orbit-excursion Fixed Field Alternating Gradient Accelerators (V-FFAGs) and 3D Cyclotrons |
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- S.J. Brooks
BNL, Upton, Long Island, New York, USA
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FFAGs with vertical orbit excursion (VFFAGs) provide a promising alternative design for rings with fixed-field (e.g. superconducting) magnets. They have a vertical magnetic field component that increases with height in the vertical aperture, yielding a skew quadrupole focussing structure. Scaling type VFFAGs have fixed tunes and no intrinsic limitation on momentum range; they are also isochronous in the ultra-relativistic limit. Extending isochronism to lower velocities requires a slanted orbit excursion: a three-dimensional analogue of a spiral sector cyclotron from 40 to 1500MeV is developed, which is flat at low energies and acquires a slope as the protons become relativistic. This provides more stable tunes than a comparable planar cyclotron. Such machines are promising future candidates for nuclear transmutation using high average power CW beams at ~GeV energies.
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Slides TUYB01 [16.187 MB]
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2014-TUYB01
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