The phase stability of a 140-GHz, 1-kW pulsed gyro-amplifier system and the phase dependence on the cathode voltage were experimentally measured. To optimize the measurement precision, the amplifier was operated at 47 kV and 1 A, where the output power was ∼30 W. The phase was determined to be stable both pulse-to-pulse and during each pulse, so far as the cathode voltage and electron beam current are constant. The phase variation with voltage was measured and found to be 130 ± 30°/kV, in excellent agreement with simulations. The electron gun used in this device is non-adiabatic, resulting in a steep slope of the beam pitch factor with respect to cathode voltage. This was discovered to be the dominant factor in the phase dependence on voltage. The use of an adiabatic electron gun is predicted to yield a significantly smaller phase sensitivity to voltage, and thus a more phase-stable performance. To our knowledge, these are the first phase measurements reported for a gyro-amplifier operating at a frequency above W-band.

通过实验测量了 140 GHz、1 kW 脉冲陀螺放大器系统的相位稳定性和相位对阴极电压的依赖性。为了优化测量精度，放大器在 47 kV 和 1 A 下运行，其中输出功率约为 30 W。确定相位在脉冲到脉冲和每个脉冲期间都是稳定的，直到阴极电压和电子束电流是恒定的。测量随电压的相位变化，发现为 130 ± 30°/kV，与模拟非常吻合。该设备中使用的电子枪是非绝热的，导致电子束间距因子相对于阴极电压的斜率陡峭。发现这是相位对电压的依赖性的主要因素。预计绝热电子枪的使用会产生明显更小的电压相位敏感性，从而获得更稳定的相位性能。据我们所知，这些是针对工作在 W 波段以上频率的陀螺放大器报告的第一次相位测量。