Speaker
Description
The FLASH hadron therapy accelerator proposed by Trbojevic uses permanent magnets with nonlinear fields to allow rapid cycling from 10 to 250MeV while keeping the ring tune constant. A test beamline of four cells from this ring (22.5 degree angle) was built at BNL and tested at the NSRL facility with protons and at the Tandem Van de Graaff with deuterons. The magnets consist of 24 neodymium-iron-boron (NdFeB) wedges magnetised in different directions and arranged to produce the required nonlinear field profile across the oval aperture for the beam movement, with fields of up to 1.85 Tesla. Beams were transmitted at all rigidities tested over a 5.3x momentum ratio, with output location moving systematically with energy as required.
Funding Agency
Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
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