| Project/Area Number |
02804011
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
核・宇宙線・素粒子
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| Research Institution | Osaka University |
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Principal Investigator |
FUJITA Yoshitaka Osaka University, College of General Education Research Associate, 教養部・物理教室, 助手 (60093457)
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| Co-Investigator(Kenkyū-buntansha) |
SASAKI Shosuke Osaka University, College of General Education Lecturer, 教養部・物理教室, 講師 (60029717)
TAKAHASHI Noriaki Osaka University, College of General Education Professor, 教養部・物理教室, 教授 (10028152)
SHIMODA Tadashi Osaka University, College of General Education Associate Professor, 教養部・物理教室, 助教授 (70135656)
MIYATAKE Hiroari Osaka University, College of General Education Research Associate, 教養部・物理教室, 助手 (50190799)
NISHIJIMA Shigehiro Osaka University, Institute for Industrial Science Research Associate, 産業科学研究所, 助手 (00156069)
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| Project Period (FY) |
1990 – 1991
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 1991: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1990: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | cryostat / SQUID / Detection of a Charged Particle Without Touching |
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| Research Abstract |
A weak magnetic field follows a moving charged particle and the strength of the field increases with the velocity of the particle. Accoridng to our calculation using the theory of special relativity, it is predicted that the strength of the magnetic field induced by a charged prticle moving with a relativistic speed have an order of magnitude detectable by a SQUID. This fact opens a possibility of detecting a charged particle without directly "touching". As a first step we develop a crystal for the installation of the SQUID which should be operated at the helium temperature. The crystal is characterized with a hole through which charged particles can come and go.
Thinking of the future development, we decided to use FRP material instead of metal such as stainless steel. The type of the FRP was examined in order to survive the low temperature and to achieve good magnetic character. For the liquid and the vacuum seal, a screw system has been tested and developed, which makes the assembling and the deassembling easy. In a preliminary test we succeeded in sealing the liquid nitrogen and also the liquid helium. The prototype crystal could keep the liquid nitrogen for a while, but it was not possible to reach the stage of keeping the liquid helium. The cause of the leakage was detected and we hope we can keep them after the improvement progressing now.
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