I have no idea if this is the right place for this topic. Recently, I have been reading about particle accelerator operation and theory. I had never realized exactly how the particles were accelerated. Turns out the particles are are bunched together in clumps by an ac wave and accelerated. Question: since the particles are in clumps rather than spread out in the tube, is the magnetic field they produce uniform or non-uniform? In other words, could the magnetic field produced by these particles in motion induce a current in a nearby coil? Thanks in advance!