二次諧波磁旋震盪器之效率提升研究

Abstract

諧波震盪交互作用已經被發現可以降低磁場的需求s倍。然而諧波藕合係數會隨著s降低並且隨著rL增加，這代表著需要更高的功率及電子能量，才可以產生足以和電子進行諧波藕合的場強。可以利用這樣的趨勢來產生超越一次諧波的功率。本研究試圖找尋磁旋震盪器在二次諧波環境下的最佳條件，並探討線性磁場對一次即二次諧波產生的效率提升效果。

It is shown that harmonic cyclotron interaction can alleviate the magnetic-field requirement by a factor of s . However, the harmonic coupling coefficient decreases with s and increases with rL, which suggests that greater beam power and higher electron energy are required to generate the required field strength for efficient harmonic interaction. This trend may be exploited for the generation of high peak power beyond that obtainable in the fundamental harmonic interaction. In this study, we try to find the optimum working condition for a gyrotron oscillator at second harmonic mode. We also investigate the advantage of taper magnetic field in the enhancement of efficiency.