| Project/Area Number |
08554014
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Space and upper atmospheric physics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
NAKMURA Masato The University of Tokyo, Graduate School, Faculty of Science, associate professor, 大学院・理学系研究科, 助教授 (20227937)
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| Co-Investigator(Kenkyū-buntansha) |
TSUKAGOSHI Osamu ULVAC,Chiel Engineer, 技術開発部, 主任研究員
HIYAGON Hajime The University of Tokyo, Graduate School, Faculty of Science, assistant, 大学院・理学系研究科, 助手 (70192292)
SUGIURA Naoji The University of Tokyo, Graduate School, Faculty of Science, associate professo, 大学院・理学系研究科, 助教授 (80196716)
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| Project Period (FY) |
1996 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥13,400,000 (Direct Cost: ¥13,400,000)
Fiscal Year 1998: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1997: ¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1996: ¥8,300,000 (Direct Cost: ¥8,300,000)
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| Keywords | mass spectrometer / second stage stable region / field emission |
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| Research Abstract |
We have developed a high resolution quadrapole mass spectrometer used in space since 1996. The key techniques are the field emission electron source on the semi-conducting baseplate for gas ionization and using the second stage stable region for mass spectroscopy.
1. Test circuit built in 1996 to confirm the concept of second stage stable region for mass spectroscopy did not work at first. Et was due to the oscillation in the circuit caused by the current loop. Removing the problem, the circuit using all solid state components was found to be very stable and worked well with the quadrapole mass spectrometer sensor head. The linearity, the stability, and the mass resolution were as good as we expected.
2. Field emission electron source constructed on the semi-conducting baseplate was provided by the Electrotechnical Laboratory. We have tested it with its stability, the tolerance to the poor vacuum condition, and the gas ionization rate. Stability of the electron emission was poor with single tip but is improved with tip array up to 1000. It can be controlled by the current limitter circuit using FET.We found the electron emission was normal with 10^<-6> Torr but degraded with lO^<-3> Torr vacuum condition. The emission recovered 1-2 hours later after the vacuum condition was improved. The gas ionization rate was measured by detecting the ion current and was found to be consistent to the theoretical study.
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