STRUCTURE OF 3-D COULOMB CRYSTAL DEPENDING ON OUTER ENVIRONMENT

取决于外部环境的 3 维库仑晶体结构

• 批准号: 13480127
• 负责人: HAYASHI Yasuaki
• 金额: $ 10.69万
• 依托单位: Kyoto Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13480127/
• 关键词: coulomb crystal; plasma; fine partcile; microgravity; dusty plasma; self-organization; fine particle plasma; crystal; クローン結晶; 構造相転位; 相変態; 構造相転移

Negatively charged fine particles in a plasma are surrounded by positive ions and is crystallized. such a crystal is expected to be applied to the analyses of physical phenomena in a real crystal, however the formation of 3-d structure of the crystal is difficult due to the anisotropic forces by gravity and ion flows. Therefore, under microgravity, a 3-D Coulomb crystal was tried to be formed and the behavior of fine particles were analyzed in this research.Microgravity experiments of fine-particle plasma were carried out by the use of a drop experiment facility and parabolic flights, and fine-particle ordering and behavior have been analyzed in the change of gravitational conditions. Fine particles aligned in radical directions were observed under microgravity, while they were aligned in the vertical direction under gravity. It has been suggested that under gravity the mutual influence between positive ion flow and negative fine particles results in the vertical alignment of fine particles and the vertical flow of ions toward fine particles along with the deformation of plasma. Thus fine particle plasmas are self-organized, so that the method of injection of fine particles should affect the arrangement of fine particles. Although the final goal that is the formation of a 3-D Coulomb crystal in a isotopic force field was not achieved, the new finding should be useful for the development of the research in future.

等离子体中带负电荷的微粒被正离子包围并结晶。这种晶体有望应用于分析真实的晶体中的物理现象，然而，由于重力和离子流的各向异性力，晶体的3-D结构的形成是困难的。为此，本研究尝试在微重力条件下形成三维库仑晶体并分析细粒子的行为，利用落滴实验装置和抛物飞行器进行了细粒子等离子体的微重力实验，分析了重力条件变化下细粒子的有序性和行为。在微重力条件下观察到径向排列的微粒，而在重力条件下观察到垂直排列的微粒。在重力作用下，正离子流和负粒子流的相互影响，导致了等离子体中粒子的垂直排列和离子沿着向粒子的垂直流动。因此，细颗粒等离子体是自组织的，因此细颗粒的注入方法应该影响细颗粒的排列。虽然最终的目标是在同位素力场中形成三维库仑晶体，但这一新发现对今后的研究有一定的指导意义。

项目成果

林康明: "ダストプラズマとカーボン微粒子"プラズマ・核融合学会誌. 78巻5号. 320-324 (2002)

Yasuaki Hayashi：“尘埃等离子体和碳粒子”日本等离子体和核聚变学会杂志，第 78 卷，第 5 期。320-324（2002 年）。

Yasuaki Hayashi: "Structural Transition of 3D Coulomb Crystals in Dusty Plasmas"Non-Neutral Plasma Physics. IV. 191-200 (2002)

Yasuaki Hayashi：“尘埃等离子体中 3D 库仑晶体的结构转变”非中性等离子体物理学。

M.Salimullah, P.K.Shukla, S.K.Ghosh, H.Nitta, Y.Hayashi: "Electron-phonon coupling effect on wakefields in piezoelectric semiconductors"J.Phys.D : Appl.Phys.. 36. 958-960 (2003)

M.Salimullah、P.K.Shukla、S.K.Ghosh、H.Nitta、Y.Hayashi：“电子声子耦合对压电半导体尾场的影响”J.Phys.D : Appl.Phys.. 36. 958-960 (2003)

林 康明: "ダストプラズマとカーボン微粒子"プラズマ・核融合学会誌. 78. 320-324 (2002)

Yasuaki Hayashi：“尘埃等离子体和碳粒子”日本等离子体与核聚变学会杂志 78. 320-324 (2002)。

Yasuaki Hayashi: "Structural Transition of 3D Coulomb Crystal in Dusty Plasmas"Non-neutral Plasma Physics. VI. 191-200 (2002)

Yasuaki Hayashi：“尘埃等离子体中 3D 库仑晶体的结构转变”非中性等离子体物理。