| thyristor's turn-on time. The flatness of modulator pulses is 0.08% (2007) | |||||||||||||
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| INTRODUCTION The FELI is now operating two IR-FELs using an 80-MeV linac with a thermionic gun and is constructing a 165-MeV linac and a UV-FEL facility. It is essentially necessary for linac-based FELs using pulsed rf sources to get a stable and long rf pulse from a klystron. A stable and long rf pulse sources enables to yield a stable and saturated FEL pulse source. The FELIX group has succeeded in keeping a pulsed rf source stable to accelerate a 22.5-MeV, 10-s beam with an energy spread of 0.5%[1]. For this purpose, we have developed a 24-MW, 24-s pulse power modulator for an Sband klystron (Toshiba E3729) at three operation modes shown in Tab. 1. Mode 1 and Mode 2 are for FEL generation and Mode 3 is for injection to a storage ring. Table 1 Parameters of Klystron Modulator Mode Mode 1 Mode 2 Mode 3 Output voltage(kV) 285 304 390 Output current(A) 280 305 477 Pulse width(s) 24 12.5 0.5 Flat-top (p-p) | |||||||||||||
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