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Development of a 140GHz 3rd cyclotron harmonic gyro-peniotron oscillator

140GHz第三回旋加速器谐振陀螺-正负电子振荡器的研制

基本信息

批准号：
62880001
负责人：
ONO Shoichi
金额：
$ 11.33万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

High power millimetre wave tubes are great important devices in fusion plasma researches for the electron cyclotron resonance heating and plasma diagonostics. The development of tube with shorter wavelength up to submillimetre wave range is especially required in large fusion devices. The high harmonic gyro-peniotron is desirable for such high power and high frequency applications as the above because of its lower magnetic field requirement and higher operation frequency due to the favorable peniotron operation mechanism than these of other cyclotron fastwave tubes.In this project, wa have performed the following tasks concerning with the 3rd cyclotron gyro-peniotron development.1. Design of 140GHz gyro-peniotron We designed the TE<@2021<@D2 mode cavity and the electron gun, thich were used for the test tube operating at the third harmonics of the cyclotron frequency and at the beam conditions of acceleration voltage and curent of 60KV and 10A, respectively. The design specifications of the test tube are as follows: Oscillation frequency is 140GHz, starting current is 4A and the output power and the efficiency are 45.5KW and 9.0%, respectively. The test tube was fabricated at Toshiba corporation.2. Experimental results and discussions The 3rd cyclotron harmonic oscillation at 139.5GHz initiates at the beam current of 5A and the output power increases with increase of the beam current. The mode of oscillation is verified to be TE_<021> mode by measuring the radiation pattern from the output waveguide. Up to date, the maximum output power of 3.3KW was obtained at beam current of 6A. We are expecting to be able to increase considerably its output power by readjusting the arrangement of centre axes of the test tube and the used magnets. No mode compitition has been observed as expected from the simulation results.

高功率毫米波管是聚变等离子体研究中用于电子回旋共振加热和等离子体诊断的重要器件。在大型聚变装置中，尤其需要研制波长更短、可达亚毫米波范围的电子管。与其他回旋快波管相比，高次谐波回旋加速器具有较低的磁场要求和较高的工作频率，适合于上述高功率和高频应用。在本项目中，我们完成了关于第三代回旋加速器发展的以下工作。140 GHz回旋加速器的设计我们设计了TE&lt；@2021&lt；@D2模腔和电子枪，分别用于回旋频率的三次谐波和加速电压为60KV、电流为10A的束流条件下的试管。试管的设计指标为：振荡频率140 GHz，启动电流4A，输出功率45.5KW，效率9.0%。试管是东芝公司制造的。实验结果和讨论139.5 GHz的第三回旋谐振荡器在束流为5A时发生振荡，输出功率随束流的增大而增大。通过测量输出光波导的辐射方向图，验证了振荡模式为TE_(021)&gt；模。到目前为止，在束流为6A时，获得了3.3KW的最大输出功率。我们希望通过调整试管和用过的磁铁的中心轴的排列，能够大大增加它的输出功率。从模拟结果来看，没有观察到预期的模式竞争。