Development of Medium Power, High Quality, Submillimeter Wave Gyrotron and Its Application to Plasma Measurement

项目的目标如下：1.项目目标；发展中功率、高质量、亚毫米波回旋管；它作为亚毫米波源在等离子体散射测量中的应用。1991-1993年期间取得的主要成果如下：1。两所大学利用12 T超导磁体研制了高频亚毫米波回旋管。在福井，利用电子回旋共振的基次、二次和三次谐波实现了高达636 GHz的频率可调回旋加速器（gyrotron FU III）。输出功率为几百瓦。在悉尼，通过引入福井开发的二次谐波操作，实现了从150 GHz到615 GHz的频率可调性。回旋管具有连续工作的重要优点，而输出功率低，即几毫瓦到几十瓦。在福井，更多的米波回旋加速器是脉冲的。长脉冲操作是等离子体散射测量的必要条件。利用GYROTRON FU II，实现了0.6 msec, TE_<161>模式的二次谐波（频率为352 GHz）工作。输出功率150w，适用于等离子体测量作为电源。亚毫米波回旋管的调幅调制和调频调制回旋管的调幅调制和调频调制对其在更广泛领域的应用具有重要意义。这种调制是通过调制电子枪的阳极电压和阴极电压来实现的。基频和二次谐波的模式竞争与合作通过抑制与基频的模式竞争，实现了高频回旋管发展所必需的二次谐波单模操作。另一方面，在一定运行条件下，二次谐波运行触发基态运行（一种模式合作）。结果，基波的起始电流减小，从电子束中提取的总能量增加。利用回旋管作为电源的等离子体散射测量利用回旋管FU II作为亚毫米波源，与美国国家聚变科学研究所合作，成功地完成了在CHS装置中漂移波的散射测量。在悉尼的等离子体加热实验中，对TORTUS托卡马克中的阿尔芬波进行了散射测量。少

Objectives of the project are as follows, 1. Development of medium power, high quality, submillimeter wave gyrotron, and 2. Its application to plasma scattering measurement as a submillimeter wave source.Main results obtained through the term (1991-1993) are as follows,1. Development of high frequency gyrotron using the second and the third harmonic operationsHigh frequency, submillimeter wave gyrotrons are developed in both universities using 12 T superconducting magnets. In Fukui, a frequency tunable gyrotron (GYROTRON FU III) up to 636 GHz is realized by the fundamental, the second and the third harmonics of electron cyclotron resonance. Output powers are several hundred watts. In Sydney, a frequency tunability from 150 GHz to 615 GHz is attained by introducing the second harmonic operation developed in Fukui.The gyrotron has a important advantage of continuous operation, while output power is low, that is, several milliwatt to several ten watts.2. Long pulse operation of a submilli … More meter wave gyrotronGyrotrons in Fukui are pulsed. Long pulse operation is necessary for its application to plasma scattering measurement. Using GYROTRON FU II, 0.6 msec, TE_<161> mode operation at the second harmonic (frequency is 352 GHz) has been achieved. The output power is 150 W, which is applicable to plasma measurement as a power source.3. Amplitude modulation and frequency modulation of a submillimeter wave gyrotronBoth modulations of a gyrotron are important for its application to wider fields. Such modulations have been achieved by modulating anode voltage and cathode voltage of electron gun, respectively.4. Mode competition and cooperation between the fundamental and the second harmonic operationsSingle mode operations at the second harmonic which are necessary for development of high frequency gyrotron have been achieved by suppressing mode competition with the fundamental operations. On the other hand, under some operation condition, the second harmonic operation triggers a fundamental operation (a kind of mode cooperation). As the results, a starting current of the fundamental decreases and total energy extracted from the electron beam increases.5. Plasma scattering measurement using a gyrotron as a power sourceUsing GYROTRON FU II as a submillimeter wave source, a scattering measurement of a drift wave in CHS device is successfully done under collaboration with National Institute of Fusion Science. In Sydney, a scattering measurement of Alfven wave in TORTUS Tokamak is also done in the plasma heating experiment. Less