| Project/Area Number |
11440126
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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 | 一般 |
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| Research Field |
物理学一般
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| Research Institution | Tokyo University of Science |
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Principal Investigator |
MORINAGA Atsuo Faculty of Science & Technology.,Tokyo University of Science Professor, 理工学部, 教授 (90246687)
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| Project Period (FY) |
1999 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥14,900,000 (Direct Cost: ¥14,900,000)
Fiscal Year 2001: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 2000: ¥5,100,000 (Direct Cost: ¥5,100,000)
Fiscal Year 1999: ¥7,300,000 (Direct Cost: ¥7,300,000)
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| Keywords | Bose-Einstein condensation / magneto-optical trap / polarization gradient cooling / magnetic trap / evaporative cooling / non-resonant light field / atom interferometer / scalar Aharonov-Bohm effect / スカラーアハラノフ・ボーム効果 / ダーク磁気光学トラップ |
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| Research Abstract |
In this project, we aimed to examine the interaction of the Bose-Einstein condensation for gaseous atoms with nonresonant light fields for the purpose of searching a possibility of application of the Bose-Einstein condensation to industry. Concretely, we tried to condense the sodium atoms in a magnetic trap. The project was done from 1999 for three years and got the following results. 1.We developed a clover-leaf magnetic trap consist of a quadruple magnetic field and a bias field, and made a glass cell, in which sodium atoms could be trapped magneto-optically or magnetically. Also, we developed a timing sequence of controlling light fields and magnetic fields in time-domain.
2.Sodium atoms were trapped with a phase-space density of 3 × 10^<-5> by the dark and polarization gradient cooling, which was enough for achieving a Bose-Einstein condensation. We could transferred the cold sample to a magnetic trap through an appropriate mode matching. However, the present lifetime of magnetic trap was limited only 0.35 s due to a vacuum pressure of 5X 10^<-9> Torr, which is not enough time to condense cold atoms by the evaporative cooling. Now we are trying to improve the vacuum.
3.Instead of the condensed atoms, we use cold atoms and investigated the interaction with a non-resonant light field We used a stimulated Raman transition to split wave packet coherently and developed a time-domain atom interferometer and verified the scalar Aharinov-Bohm effect.
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