Fast high voltage pulser for the southern advanced photon source

Abstract

The Southern Advanced Photon Source (SAPS) is a planned fourth-generation synchrotron radiation facility featuring a low-emittance storage ring. For the H-7BA lattice design, the dynamic aperture is significantly smaller than the physical aperture, necessitating the use of a strip-line kicker based on an on-axis injection scheme. To minimize interference from the pulser on adjacent beams, a nanosecond pulser with stringent rise and fall time requirements is essential. A prototype pulser, based on a semiconductor opening switch, was developed to meet these demands. A nonlinear transmission line loaded with ferrite was utilized for pulse shaping, yielding favorable results. The prototype generated a pulse at a 50 Ω load with a rise time (10%–90%) of 2.4 ns, a fall time (90%–10%) of 3.9 ns, a pulse width (10%–10%) of 7.8 ns, and an amplitude of 19.8 kV. This paper presents the detailed design, optimization, and performance evaluation of the pulser.