Pulse Modulator Developments For Japan Linear Collider

Abstract

Accelerator Test Facility (ATF) is now under construction to develop the major accelerator components of Japan Linear Collider (JLC)[l]. The ATF consists of a 1.54 GeV S-band linear accelerator and 1.54 GeV damping ring. Nine 85 MW klystrons (TOSHIBA W712) are used as rf sources of the linac. Various components have been developed for compact size, high efficiency, high stability and long life of modulators. In order to make a compact modulator, a compact self-healing (SH) type of capacitor has been developed. Three compact pulse modulators have been designed and constructed to drive the 85 MW klystrons. In this paper, the design, specifications and results of performance tests of the modulators are described.