铁电阴极相对论行波管初步研究

 研究了铁电材料的电子发射特性，根据实验和数值模拟结果给出了铁电发射特性的定性解释，并指出目前的几种铁电发射理论都不足以完备地解释各种实验现象。设计了Pierce型铁电阴极电子枪，实现了束流的二级压缩，其总束流大于100 A。在此基础上，分析和设计了具有盘荷波导慢波结构的相对论行波管，得到了带宽500 MHz，增益约25 dB的X波段行波放大输出。

High power traveling wave tube using ferroelectric electron gun

A high power traveling wave tube (TWT) using a ferroelectric cathode as the electron source is reported. The Ferroelectric electron gun (FEG) consists of PLZT ceramic and field enhancing grids, which allows an electron beam to be extracted from the FEG with relatively high beam quality. With the peak current exceeding 100 A, the electron beam is compressed downstream, before it enters into the slow wave structure of the TWT. Both the theoretical analysis and the experimental results show that the mechanism of electron emission is rather complicated. Nevertheless, the radio frequency experiment suggests that the TWT be capable of producing a microwave output at X-band (9.15 GHz), with a band-width of 580 MHz. The measured maximum output power is 5.8 MW, corresponding to 25.2 dB gain. This proof-of-principle study has validated the electron emission capability of ferroelectric materials in intensive electric fields and its potential application as a high` quality electron beam source.