Blumlein-type X-band klystron modulator for Japan Linear Collider

A Blumlein-type X-band klystron modulator using magnetic-pulse-compression techniques was designed and constructed for the future Japan Linear Collider project. This modulator has been designed to produce pulses that are 200-ns wide, have a 600-kV peak voltage, a 1200-A peak current, a short rise time of approximately 70 ns, and a repetition rate exceeding 200 Hz. To realize a compact modulator, a spiral structure was adopted for conductors of the triaxial Blumlein. Special care was taken with the location of the magnetic switch and the charging reactor in order to eliminate any undesirable voltage during the charging process. Details concerning this X-band klystron modulator and its preliminary performance are described.<
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