D-Pace, Nelson, British Columbia, Canada
AccSys, Pleasanton, California, USA
D-Pace has developed a specialized high-power beamline for transporting a 20 mA 2.5 MeV CW proton beam for a BNCT (Boron Neutron Capture Therapy) application. The 2 m horizontal by 4 m vertical layout transports the space-charge dominated beam with less than 1% beam-spill using two sets of 10 T/m quadrupole doublets, DC xy steerer, 90 degree bending magnet, and AC x & y magnets for raster-scanned flat-topped round or square intensity distributions deposited over targets with 40 - 100 mm maximum dimensions. Diagnostics include New Parametric Current Transformers, graphite water-cooled electrically-isolated collimators with readbacks, and a low-power sapphire beam profile monitor for macro-pulsed beams (~100 micro-second wide pulses at low frequency). This paper describes the specialized: beam-optics, device designs, intensity distributions, and also the latest commissioning results.
