Phase Stability of Locked Gyrotrons

Phase measurements between a master oscillator and its slave gyroklystron have been made.The pulsed gyroklystron was operated both as an amplifier and as a phase triggered oscillator. As an amplifier, the phase jitter during the 3 microsec pulse was 20 deg; from pulse-to-pulse the jitter was 0.86 deg. As a phase triggered oscillator the jitter of the firing point from shot-to-shot was less than 7 deg even at input-to-output power ratios as large as 52 dB. The significance of these results for linear accelerator applications is discussed.