太赫兹史密斯-珀塞尔辐射源带状电子注阴极的研究

Development of Sheet Electron Beam for THz Smith-Purcell Radiation Source

为适应太赫兹史密斯-珀塞尔辐射源的迫切需求,研究从阴极表面直接产生微米尺度带状电子注的技术和检测方法,获得电流密度50 A/cm2,600μm×100μm的矩形层流电子注。

High current density sheet electron beams have been attracted great attention for their potential application in THz vacuum electron devices like Smith-Purcell radiation sources and encouraged the development of cathodes emitted small dimension sheet electron beams with high current density in reasonable operating time. Scandia Doped Impregnated （SDI） cathode has the capability of operating stably with pulsed current densities of 60-70 A/cm^2 at 950 ℃b so as to become the most promising cathode to meet the requirements. In this paper we reported the approaches and results of directly generation of 600μm× 100 μm sheet beams with current density of over 50 A/cm^2 from these cathodes.