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Experimental studies of amplification in a two-cavity X-band gyroklystron are reported. The system utilizes a thermionic magnetron injection gun at voltages up to 440 kV and currents up Our present efI'ort to increase gyroklystron power levels has focused on two issues. The first involves increasing the beam voltage above conventional (long pulse) levels as described in previous design papers [11,12] [14]. In this paper, we briefly describe the experimental configuration, discuss the microwave diagnostics, and present optimal twocavity gyroklystron performance.Details of the experimental setup, tube stability, and flat-field amplifier experiments that achieved peak powers of 2.7 MW appear elsewhere [15].A schematic of the overall system is shown in Fig. 1(a). A 1.5-ps, 500-kV, 400-A line-type modulator provides the required voltages to the MIG. Eight water-

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