| Project/Area Number |
09555186
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Physical properties of metals
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| Research Institution | Teikyo University of Science and Technology |
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Principal Investigator |
DOYAMA Masao Professor, Faculty of Science and Engineering, Teikyo University of Science and Technology, 理工学部, 教授 (40010748)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAHARA Seiichi Director, Research and Development, JEOL, 電子光学技術本部, 研究開発部長
KURIHARA Toshikazu Research Associate, KEK, 物理学研究所, 助手 (60215069)
KOGURE Yoshiaki Professor, Faculty of Science and Engineering, Teikyo University of Science and Technology, 理工学部, 教授 (20016124)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥9,300,000 (Direct Cost: ¥9,300,000)
Fiscal Year 1999: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1998: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1997: ¥6,100,000 (Direct Cost: ¥6,100,000)
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| Keywords | POSITRON MICROSCOPES / Scanning Positron Microscopes / Imaging Plates / 陽電子 / イメジングプレート / 陽電子の減速 |
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| Research Abstract |
The final goal of the research projects is to make a positron microscope converting a used commercial electron microscope. A used scanning electron microscope JMS-25S has been moved from the Teikyo University of Science and Technology to KEK, Tsukuba and set near a liniac. A cooling system has been completed. However, the liniac reformed recently and positron beam has not been available to the microscope area. So the microscope has not been directly connected to the liniac.
Positron lenses have been designed. Kinetic energies of positrons are not monovalued but continuous, either from nuclear decays or creation of positron and electron pairs. A broad beam is coming from the liniac. First, we will use a tungusten foil to reduce the kinetic energies. The work function of positrons is negative, this means thermalized positrons will be ejected from the surface with a low energy of the order of 1 eV. The ejected positrons will be focused on a nickel foil and this is repeated twice. The diameter of focused point will be of the order of one hundredth of millimeter. This is replaced with the electron gun of the scanning electron microscope.
For recording positron images, we have shown for the first time in the world, that imaging plates are suitable to record positron images. We have obtained a characteristic curve of imaging plates for positrons.
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