432-MHz RF source for the JHP proton linac

A high duty UHF (432-MHz) RF source for the intense proton linac of the Japanese Hadron Project (JHP) has been constructed at KEK. A test-linac consisting of a RFQ and a drift-tube (DTL) structures is under construction. The UHF RF power generated by 2-MW peak power klystron will be fed into these structures with 650 /spl mu/sec pulse-duration and 50 Hz repetition-rate through an waveguide system with a Y-junction circulator. A dc high voltage (max. 95 kV) is applied to a cathode of the klystron and a beam current is modulated up to 40 A by a pulsed high voltage (max. 80 kV) applied to a modulating anode. The klystron power supply can operate two such klystrons simultaneously with two individual anode modulators. The first operation of this RF power source and the preliminary test of an RF signal processing such as PLL and ALC are reported.<>