内导体倾斜对同轴回旋管高频特性及欧姆损耗分布影响的研究

The Study on the Effects of Tilted Inner Conductor on the High-Frequency Characteristics of Coaxial-Gyrotron and Its Ohmic Loss Distribution

论文研究了内导体微小倾斜对品质因数Q值、谐振频率、电子效率以及欧姆损耗密度的影响,并分析了一支170 GHz兆瓦级同轴回旋管。结果表明,品质因数Q值随倾斜角θ增大而略微降低。在0°-0.5°范围内,当θ稍微增大时,电子互作用效率稍微减少。因为模式竞争,当θ大于0.5°时,电子互作用效率减少率加快。如果θ增加到1.5°,由于模式竞争加剧,电子互作用效率降低到只有4.1%。对于冷腔和热腔,随着θ增大,谐振频率都稍微减小。对于欧姆损耗密度分布,内导体倾斜改变了欧姆损耗密度在内导体的分布,形成了以倾斜的内导体为轴的对称分布。然而,倾斜内导体对外导体的欧姆损耗密度分布几乎没影响。

The effects of the small tilted inner conductor in a coaxial-gyrotron on the quality factor Q,resonant frequency,electronic interaction efficiency,and Ohmic losses are investigated.A 170 GHz megawatt coaxialgyrotron is analyzed.The results show that the quality factor Q decreases slightly when the tilt angle θ increases.The electronic interaction efficiency drops slightly when θ increases within the range of 0°-0.5°.However,it drops at a faster rate when θ is larger than 0.5° because of mode competition.If θ increases to 1.5°,due to mode competition,the efficiency decreases sharply to only about 4.1%.For both cold and hot cavities,the resonant frequency decreases very small with θ increasing.As regards Ohmic loss density distribution,the tilted inner conductor changes the Ohmic loss density distribution on the inner conductor and makes it form a symmetrical distribution with a tilted axis.Meanwhile,it has little effect on the Ohmic loss density distribution on the outer conductor.