The Development of a Prototype Transmission Positron Microscope

近年来，我们对正电子（电子的反物质）的理解得到了很好的扩展。因此，将其用作显微探针变得现实。本项目的主要目标是发展透射正电子显微镜的基本技术。设计制造了一个原型透射正电子显微镜与最简单的设置，2。在能量、束直径、角度偏转方面，产生良好聚焦的正电子束; 3.本文主要研究了聚焦光束的加速和扫描问题。透射正电子显微镜原型的设计和制造：超高真空系统，正电子计数系统等的引入使我们能够以最简单的设置构建原型显微镜。2.高亮度正电子枪的设计与制造：采用几种静电透镜，产生了高亮度正电子束。光束的特性被认为是适合于微光束入射到显微镜。3.通过静电加速透镜、扫描电极、聚光透镜、物镜透镜和投影透镜等的组合，建立了100键透射正电子显微镜的样机，并利用上述研究结果，对该显微镜进行了详细的测试，使100键左右的正电子与固体相互作用的研究成为可能。

In recent years, our understanding of a positron, an antimatter of an electron has been well expanded. As a result, the use of it as a microscopic probe becomes realistic. The aim of the present project is the development of basic techniques for a transmission positron microscope as follows: 1. the design manufacture of a prototype transmission positron microscope with the simplest setup, 2. the production of well focused positron beam with respect to energy, beam diameter, angular diversion, 3. the acceleration and scanning of such a well focused beam.Research results are summarized as follows: 1. the design and manufacture of a prototype transmission positron microscope: The introduction of a ultra high vacuum system, a positron counting system and so on enabled us to construct a prototype microscope with the simplest setup. 2. the design and manufacture of a high brightness positron gun: By the use of several types of electrostatic lenses, a high brightness positron beam was produced. The feature of the beam was found to be suitable for the micro beam incident into the microscope. 3. the acceleration and scanning of such a high quality beam:By the combination of acceleration electrostatic lenses, scanning electrodes, condenser lens, objective lens and projector lens and so on, a prototype 100 key transmission positron microscope was constructed.By the above research results, the testing of the microscope in details and the study of the interaction of positrons of around 100 key with solids were made possible.