Development and Application of a Medium Power, High Quality, Submillimeter Wave Gyrotron

1. 利用二、三次谐波运行的高频回旋管的发展(1)利用12t超导磁体构建了一个可拆卸式回旋管，并在二、三次谐波下运行。最大频率分别为636ghz和444ghz，在第二和第三次谐波共振。输出功率在100到700w之间。回旋管用于等离子体诊断和材料研究。(2)构建并测试了由17t超导磁体和尖端管组成的高频回旋管。回旋管在基频工作时达到了159 ~ 430 GHz的频率可调性，在二次谐波工作时达到了336 ~ 850 GHz的频率可调性。850ghz的最高频率是回旋加速器高频工作的新世界纪录。亚毫米波回旋管的振幅和频率调制回旋管的振幅和频率调制对于作为辐射源应用于宽领域是很重要的。我们的亚毫米波回旋管在1千赫到600千赫的频率范围内实现了正弦波和方波调制。回旋管还实现了257千兆赫和260千兆赫之间的频率阶跃切换（在两种基本模式之间切换）以及223千兆赫和444千兆赫之间的频率阶跃切换（在基本模式和第二模式之间切换）。这是回旋管频率开关的首次实验。我们将回旋管应用于亚毫米波光谱学，并在以下领域进行了研究。三、基本模式与谐波模式的竞争与合作；应用于亚毫米波回旋管的准光学器件，5。6.用回旋管作电源的等离子体散射测量。以回旋管为动力源的毫米波ESR实验。

1. Development of High Frequency Gyrotrons Using the Second and the Third Harmonic Operations(1) A demountable gyrtron using a 12 T superconducting magnet has been constructed and operated under the second and the third harmonic resonances. The maximum frequencies of 636 GHz and 444 GHz at the second and the third harmonic resonances, respectively. The output powers lie in the range from 100 to 700 W.The gyrotron is useful for plasma diagnostics and studies of materials.(2) A high frequency gyrotron consisting of a 17 T superconducting magnet and a tipped-off tube has been constructed and tested. The gyrotron has attained frequency tunabilities from 159 to 430 GHz at the fundamental operations and from 336 to 850 GHz at the second harmonic operations. The maximum frequency of 850 GHz is the new world record for high frequency operation of gyrotron.2. Amplitude and Frequency Modulations of Submillimeter Wave GyrotronsBoth modulations of gyrotrons are important for applications to wide fields as radiation sources. Our submillimeter wave gyrotrons have achieved both sinusoidal-wave and square-wave modulations in the frequency range from 1 kHz to 600 kHz. The gyrotrons also have achieved frequency step switchings between 257 GHz and 260 GHz (switching between two fundamental modes) and between 223 GHz and 444 GHz (switching between a fundamental mode and a second mode). This is the first experiment of frequency switching of gyrotron.We have applied our gyrotrons to submillimeter wave spectroscopy and studied on the following fields.3. Mode competitions and cooperations between the fundamental and the harmonic mode operations, 4. Quasi-optical devices applied for submillimeter wave gyrotrons, 5. Plasma scattering measurement using a gyrotron as a power source, 6. Millimeter wave ESR experiment using a gyrotron as a power source.