2004 Fiscal Year Final Research Report Summary
Toward the realization of crystalline beams-----Overall investigation of the fundamental properties of ultracold ion beams-----
| Project/Area Number |
14340078
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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 |
素粒子・核・宇宙線
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
OKAMOTO Hiromi Hiroshima University, Graduate School of Advanced Sciences of Matter, Associated Professor, 大学院・先端物質科学研究科, 助教授 (40211809)
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| Co-Investigator(Kenkyū-buntansha) |
OGATA Atsushi Hiroshima University, Graduate School of Advanced Sciences of Matter, Professor, 大学院・先端物質科学研究科, 教授 (60023727)
ITOH Kiyokaza Hiroshima University, Graduate School of Advanced Sciences of Matter, Research Associate, 大学院・先端物質科学研究科, 助手 (70335719)
NODA Akira Kyoto University, Institute for Chemical Research, Professor, 化学研究所, 教授 (20114605)
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| Project Period (FY) |
2002 – 2004
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| Keywords | Crystalline beam / Linear Paul trap / Nonneutral plasma / Space charge effects / Laser cooling / Particle accelerator / Ion beam |
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| Research Abstract |
Theoretical Results :
1.We have derived the orbit equations that govern the motion of individual particles forming a coasting crystalline beam in a storage ring.
2.The necessary condition has been obtained to suppress the occurrence of severe collective instability during a beam cooling process.
3.A novel dispersive effect peculiar to bunched crystalline beams has been discovered.
4.In order to study the fundamental properties of ultracold ion beams systematically, we have developed a molecular dynamics (MD) code in which not only the exact lattice structure of a storage ring but also the dissipative interactions between laser photons and fast stored ions can be considered.
5.Employing the new MD simulation code, we have confirmed the effectiveness of the resonant coupling method. In addition, it has been demonstrated that one- or two-dimensional crystalline beams could be formed in a properly-designed storage ring by combining existing accelerator technologies.
Experimental Results :
1.We have designed and constructed a linear Paul trap dedicated to beam-physics purposes, in particular, the study of space-charge effects. In order to reproduce lattice-dependent phenomena in a particle accelerator, a radio-frequency power supply system that can generate an arbitrary pulse waveform has been developed.
2.Preliminary experiments have been done to check the performance of our system. Measurement data obtained with a MCP detector indicate that it is possible to confine a large number of ions in our trap for a sufficiently long time.
3.Several compact atomic ovens have been constructed to produce Ca plasmas. We have succeeded in confining an almost pure ^<40>Ca^+ plasma by applying proper bias voltages to the quadrupole electrodes.
4.We have equipped our trap system with a laser cooler that controls the phase-space density of a Ca plasma.
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