为满足惯性约束聚变(ICF)实验等离子体诊断中对X射线条纹相机大动态和高时空分辨能力的需求, 设计了一款利用板状电极对加电四极透镜聚焦方式的变像管。此款变像管最主要的特点为时空方向聚焦方式不同, 在时间方向上采用两对平板电极聚焦电子, 而在空间方向上采用电四极透镜对电子进行聚焦, 其空间分辨能力在阴极边缘处达到了40 lp/mm, 时间分辨能力在10 ps左右, 阴极有效长度为20 mm。由于变像管采用时空方向分别聚焦方式, 相对传统轴对称管型来说, 电子不会聚焦成点, 空间电荷效应更弱, 所以具有大动态能力。

In ICF experiments, high dynamic range, high temporal and spatial resolution X-ray streak camera is a necessary diagnosis tool. To meet this requirement, a streak tube which uses bilamellar electrode lens and quadrupolar lens to focus electrons has been designed. This tube uses different ways to focus electrons in temporal axis and spatial axis. In temporal axis, it uses two bilamellar electrode lenses to focus electrons and in spatial axis it uses quadrupolar lens which can reduce image aberration effectively. The spatial resolution of this tube reaches 40 lp/mm even at the edge of photocathode, the temporal resolution is about 10 ps and the effective length of photocathode is 20 mm. Using different focusing ways in temporal and spatial directions, the tube will not focus electrons to a small spot, compared with conventional rotary and symmetric tubes, and thus its space charge effect is much weaker, and dynamic range is much larger.