Development of a Frequency Tunable, Sub-Millimeter Wave Gyrotron and Its Application to the Spectroscopy in the Sub-Millimeter Wave Range

目的：1.利用回旋谐振脉塞工作原理，研制一种频率可调谐的亚毫米波回旋管。高输出功率和高效率的预期。2.将其应用于亚毫米波段光谱学光源，将促进许多领域的新技术的发展。亚毫米波回旋管的研制，（1987）研制了一种用于亚毫米波回旋管的超导磁体。场强的最大值为8 T，这对应于回旋加速器基波在220 GHz和回旋加速器二次谐波在440 GHz的操作。在已为回旋管准备好的磁体系统和电源条件下，对电子枪和谐振腔进行了计算机模拟。利用电子枪和谐振腔分别进行了二次谐波和三次谐波的实验。（1988）研究了炮-腔系统的计算机模拟程序。亚毫米波 ...更多信息 利用该代码设计了一个回旋管，并由东芝公司制造。它被设置在8 T SC磁体系统中。高压脉冲电源（最大电压70 kV，最大电流10 A）可以驱动回旋管，对于二次谐波操作在380 CHz的频率下，对于三次谐波操作在560 CHz的频率下。2.回旋管在亚毫米波光谱学源中的应用：（1）我们举办了两次研讨会，讨论了亚毫米波回旋管光谱学在凝聚态研究中的应用。首先，我们建立了2 mm波长的测量系统，并开始了该波长的ESR研究。(2)我们用回旋管作为等离子体散射源，对京都大学理学院的WT-3托卡马克和悉尼大学的TORTUS托卡马克进行了测量。(3)我们研制了准光学天线，它具有两个优点，即回旋管输出的圆波导模到线偏振模的清晰模式转换和二维良好的聚焦。我们已经用这种天线对TORTUS等离子体进行了空间分辨散射测量。少

Objectives; 1.Development of a frequency-tunable, sub-millimeter wave gyrotron by using a cyclotron harmonic maser operation. High output power and high erriciency are expected. 2. Its application to the source for spectroscopy in the sub-millimeter wave range, which will enhance new technologys in many fields.Results; 1. Development of a sub-millimeter wave gyrotron, (1987) An SC magnet for the sub-millimeter wave gyrotron was built up. The maximum value of field intensity is 8 T, which corresponds to operations at 220 GHz for a cyclotron fundamental and 440 GHz for a second cyclotron harmonic. Computer simulation for an electron gun and a cavity were carried out under the conditions of the magnet system and the power supply, which have been ready for the gyrotron. The operations at the second and the third harmonics are tried by the gun and the cavity. (1988) The study of a computer simulation code for the system consisting of a gun and a cavity has been done. The submillimeter wave … More gyrotron was designed by using the code and built up by Toshiba Corporation. It was set in the 8 T SC magnet system. High voltage, pulse power supply (Its maximum voltage and current are 70 kV and 10 A, respectively.) can drive the gyrotron, at the frequency of 380 CHz for the second harmonic operation and at 560 CHz for the third harmonic operation. 2. The application of the gyrotron to the source for spectroscopy in the sub-millimeter wave range, (1) We had workshops two times, to discuss the application of the spectroscopy using the sub-millimeter wave gyrotron to the studies of condensed matters. First of all, we have built up the measuring system at 2 mm wave length and begun the study of ESR at the wavelength. (2) we have used the gyrotron as the source for a plasma scattering experiment and measured WT-3 tokamak of Kyoto University (Faculty of Science) and TORTUS tokamak of Sydney University. (3) We have developed the quasi-optical antenna, which has two advantages, that is, the clear mode conversion from the circular waveguide mode of gyrotron output to the linearly polarized mode and the two dimensionally good focusing. We have used the antenna for the spatially resolved scattering measurement of TORTUS plasma. Less