Second harmonic gyrotron based on a 12 T superconducting magnet

A. Fliflet, S. Gold
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Abstract

Near-THz gyrotrons are of interest for applications such as remote sensing, materials processing, and dynamic nuclear polarization (DNP) enhanced nuclear magnetic resonance (NMR) applications. We are setting up a gyrotron test-bed based on a Cryomagnetics 12-T cryogen-free, 3-inch warm-bore, superconducting magnet to investigate second- and higher-harmonic gyrotrons operating at frequencies up to 1 THz. A Varian VUW-8010 triode electron gun originally designed for a 35 GHz gyrotron and driven by a hard-tube modulator will be used initially. The cathode radius is 7 mm and the gun can be operated at voltages up to 70-keV. Adiabatic scaling laws have been used to determine the approximate parameters of the gyrating electron beam that can be produced by this gun in the axial magnetic field profile of the 12-T magnet. The first experiments will operate at the second harmonic at frequencies up to 600 GHz and powers in the kilowatt range. A cavity has been designed with an interaction length of about 1 cm and a Q of 8400. Operating modes of interest include the TE18,2 and the TE57 modes. A Vlasov-type output coupler has been designed using geometric optics. Design calculations and the status of the experiment will be discussed.
基于12t超导磁体的二次谐波回旋管
近太赫兹回旋管在遥感、材料处理和动态核极化(DNP)增强核磁共振(NMR)等应用中很有意义。我们正在建立一个回旋加速器试验台,该试验台基于crymagnetics公司的12 t无低温、3英寸暖孔超导磁体,用于研究频率高达1太赫兹的二次谐波和更高次谐波回旋加速器。最初将使用瓦里安VUW-8010三极管电子枪,该电子枪最初设计用于35 GHz回旋管,并由硬管调制器驱动。阴极半径为7毫米,枪可以在高达70 kev的电压下操作。利用绝热标度定律确定了该电子枪在12-T磁体轴向磁场剖面上可产生的旋转电子束的近似参数。第一个实验将在频率高达600千兆赫的二次谐波下进行,功率在千瓦范围内。设计了一个相互作用长度约为1cm, Q为8400的空腔。感兴趣的操作模式包括TE18,2和TE57模式。利用几何光学技术设计了一种vlasov型输出耦合器。本文将讨论设计计算和实验的现状。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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