Studies on Halo Formation in a Long Magnetic Quadrupole FODO Channel First Experimental Results

Abstract

A study is progress to prepare an experiment on the transport of an intense proton beam, with high optical qualities, through a periodic magnetic quadrupole FODO channel (29 periods). It is intended to provide a better understanding of how halo develops and can be controlled as a crucial issue for the design of high-intensity linear accelerators. Simulations were done showing that this experiment can be performed with a high-brightness proton, beam produced by a duoplasmatron source, with an energy of 500 keV and a current of tens of mA. Beam pulse length will be less than 1 ms and normalized emittance better than 1.p mm.mrad (90% of total beam).Thus, transverse tune can be sufficiently depressed in the transport channel to allow instabilities to grow and halo to develop or stay under control