Further Beam Breakup Simulations for the Scorpius Linear Induction Accelerator

Beam breakup (BBU) in linear induction accelerators (LIAs) used for flash radiography is problematic because the high-frequency beam motion can blur the source spot, thereby degrading resolution. BBU can be excited by any source of RF with frequencies coinciding with cell mode resonances. Amplification depends directly on details of cell design and is suppressed in operation by the solenoidal magnetic field used for transport of the electron beam. Previous work has studied BBU excited by RF, beam head rise time, or corkscrew motion. In this article, we extend these investigations to excitation by noise, finding that to grow to much lower amplitude.