| Budget Amount *help |
¥26,000,000 (Direct Cost: ¥26,000,000)
Fiscal Year 1989: ¥10,900,000 (Direct Cost: ¥10,900,000)
Fiscal Year 1988: ¥15,100,000 (Direct Cost: ¥15,100,000)
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| Research Abstract |
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.
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