Results from the initial operation of a high-power quasi-optical gyrotron based on the 90-kV, 50-A Varian VUW-8144 electron gun are reported. The output power and efficiency have been measured for a resonator mirror separation of 19.4 cm with a magnetic field of 4.95 T, corresponding to resonator output coupling of 1.9%, and for a resonator mirror separation of 21.4 cm with a magnetic field of 4.7 T, corresponding to a resonator output coupling of 3.1%. Operation was multimoded with 3-6 modes excited in the range of 125-130 GHz for the 4.95-T magnetic field. A peak efficiency of 15% at an output power of 161 kW was obtained for a gun voltage of 93 kV and a current of 12 A. A peak-output power of 364 kW at an efficiency of 10% was obtained at a voltage of 95.6 kV and 37.5 A.
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机译：报告了基于90 kV，50 A Varian VUW-8144电子枪的大功率准光学回旋管的初始运行结果。对于谐振器镜间距为19.4 cm，磁场为4.95 T（对应于1.9％的谐振器输出耦合）和谐振器镜间距为21.4 cm，磁场为4.7 T，测量了输出功率和效率，对应于3.1％的谐振器输出耦合。对于4.95-T磁场，在125-130 GHz范围内激发的3-6种模式对操作进行了多模处理。对于93 kV的喷枪电压和12 A的电流，在161 kW的输出功率下可获得15％的峰值效率。在95.6的电压下，在10％的效率下可获得364 kW的峰值输出功率。 kV和37.5 A.
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