Permanent Magnets for a Fixed Tune Proton Therapy FFA

Very rapid cycling is required for FLASH hadron therapy accelerators, to allow multiple depths to be treated in a short space of time.  A recent design by Trbojevic uses an non-linear, non-scaling FFA with flat tunes to achieve this.  The protons are accelerated in the range from 10-250MeV, with tune variation +/-0.001 per cell.  The arc can be implemented using permanent magnets, which have now been ordered from a vendor to make a demonstration beamline at the NSRL beamline at BNL.