Abstract
A laser-switched power linac is an alternate technology for producing high-energy electron beams proposed by Willis at CERN.1 The rf-driven drift tube structure of the conventional linear accelerator is replaced by a series of circular metallic plates with a hole in the center. The electron beam is coaxial with the axes of the disks. A high-voltage pulse is applied to the outer rim of the disks, which propagates inward on the radial transmission line formed by the disks. A schematic of one of these structures is shown in Fig. 1. As the pulse travels inward it sees a continuously increasing impedance.2 Thus the transmission line acts as a step-up voltage transformer scaling as r−s, where 1/2 < s < 1. for a disk 12 cm in diameter, a hole of 1 mm, and a rise time of 1 ps, the voltage gain should be ~20.
© 1986 Optical Society of America
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