Pulsed Bending Magnet System for the Stanford Two-Mile Accelerator

The electron beam from the Stanford two-mile linear accelerator is analyzed by a high-quality magnetic deflection system in the beam switchyard. The first magnet element in this system is a pulsed switching magnet capable of switching beams of different energies and intensities to either transport system on a pulse-to-pulse basis. This magnet actually consists of five one-meter sections and is powered by pulsed high-voltage supplies (modulators). Each magnet section is excited with two modulators because it must pulse in either polarity in order to switch the beam left or right; the pulse height should be continuously variable to accommodate any beam energy. The magnetic field in these magnets rises sinusoidally 360 times a second and has a peak value at 1700 gauss. In this paper the optical properties of pulsed magnet will be discussed briefly. Detailed descriptions of the pulsed magnet modulators, the instrumentation for the magnet, and the test results will be given. The problems connected with high-power switching at high repetition rates will be discussed.