Development of a novel high power sub-THz second harmonic gyrotron.
Development of a novel high power sub-THz second harmonic gyrotron.
复制标题
DOI：
10.1103/physrevlett.103.225002
复制
发表时间：
2009-11
影响因子：
8.6
通讯作者：
T. Notake;T. Saito;Y. Tatematsu;A. Fujii;Shinya Ogasawara;L. Agusu;I. Ogawa;T. Idehara;V. Manuilov
中科院分区：
文献类型：
--
作者：
T. Notake;T. Saito;Y. Tatematsu;A. Fujii;Shinya Ogasawara;L. Agusu;I. Ogawa;T. Idehara;V. Manuilov
利用二次谐振模的回旋管在亚太赫兹频段获得了破纪录的高功率相干辐射。为了同时实现高功率和高频率，对振荡模式进行了仔细的选择，以实现无模式竞争的稳定辐射。从振荡频率、电子束之间的耦合系数和射频电场的角度确定了腔体半径。为了获得最高的垂直效率，对腔长进行了优化。此外，还介绍了一种能产生大电流薄层流束的新型电子枪。获得了功率分别为52kW和37kW的单模二次谐波辐射，频率分别为349 GHz和390 GHz。
Record-breaking high power coherent radiation at a subterahertz frequency region from a gyrotron utilizing second harmonic resonance modes was attained with a simple cavity. In order to aim at high power and high frequency simultaneously, the oscillation mode was selected carefully enough to realize stable radiation free from mode competition. The cavity radius was determined from the viewpoints of the oscillation frequency, the coupling coefficient between the electron beam, and the rf-electric field. The cavity length was also optimized for the highest perpendicular efficiency. In addition, a new electron gun which is capable of generating a thin laminar beam for a large current was introduced. Consequently, single mode second harmonic radiation with powers of 52 and 37 kW at frequencies of about 349 and 390 GHz, respectively, was achieved.