Mechanical design of a pinger system for the LBNL Advanced Light Source accelerator

A fast magnet "pinger system" has been designed for the Advanced Light Source 1.9 GeV electron storage ring. Intended for beam dynamics studies, its purpose is to provide a fast (<600 ns) transverse magnetic field pulse to perturb the orbit of an electron bunch in a single turn. A key component is the special resistive-coated ceramic beam tube which is needed for fast magnetic field penetration. The evolution of the design concept is described, with emphasis on simplifications to provide an economical and mechanically robust device.