微粒電漿液體微動力與非線性行為; Micro-Dynamics and Nonlinear Behaviors in Dusty Plasma Liquids

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題名:	微粒電漿液體微動力與非線性行為;Micro-Dynamics and Nonlinear Behaviors in Dusty Plasma Liquids
作者:	伊林
貢獻者:	物理學系
關鍵詞:	微粒電漿液體;2+1 維長鍊狀液體;波紊流;波-粒子交互作用;尾跡場;dusty plasma liquid;2+1 D liquid;nonlinear dust acoustic wave;wave turbulence;wake field;物理類
日期:	2010-08-01
上傳時間:	2011-07-13 16:23:33 (UTC+8)
出版者:	行政院國家科學委員會
摘要:	本計畫為期三年，為本實驗室近數年有關強耦合微粒電漿液體與非線性波動中微動力行為的系列實驗研究。懸浮於低壓電漿中的微米尺度微粒可透過強大庫倫交互作用力，形成強耦合固體或液體結構，可用數位光學顯微系統長期追蹤粒子運動軌跡，以瞭解一般液體中因尺度過小無法直接觀測的微動力問題。除了多年來本實驗室進行的有關二維微粒電漿液體微結構與微動力行為研究外，近三年來，我們更進一步擴展研究至2+1 維長鍊狀微粒電漿液體，與非線性波動中的微動力行為研究。系統中向下流動離子流對懸浮微粒形成的尾跡場可在微粒周圍形成電雙極導致長鍊狀的形成，為一絕佳探研2+1 維液體微動力行為的平台，我們建構三維立體影像掃瞄系統，進行了熱擾動的誘發的動力行為研究，另一方面，我們探討了脈衝雷射尾跡場的動力行為，與大振幅自發電漿聲波中，微粒如何透過波-微粒交互作用展開運動，控制波形時空演變，波碎行為等重要議題。本計畫將仍然沿此二軸線對不同重要議題進行探討。對2+1 維微粒電漿液體，將探討外加週期剪力對沿長鍊方向傳播的非線性橫波行為，崩盤式微結構重整的預測性問題，焠冷至冷液態或玻璃態的暫態動力行為等。在非線性微粒電漿聲波方面，將探討波紊流的統計行為及波紊流-微粒交互作用動力行為，電漿氣泡與微粒電漿聲波交互作用，與超音速入侵體所造成暴震波與尾跡場的動力行為研究。上述議題均為相關領域中尚未直接透過直接觀測探討的重要議題，其研究不僅對微粒電漿物理領域重要，更有助瞭解其他相關的非線性複雜系統中的非線性行為。研究主要將以實驗方式進行，並配合進行部分數值模擬。 This 3-year project continues our series experimental researches on micro-structure and motion in the liquid system and in waves excited in dusty plasma liquid. The dusty plasma liquid (DPL) can be formed by micro-meter sized dust particles negatively charged and suspended in low pressure gaseous discharges. The capability of direct dust tracking through optical microscopy makes it a good platform to mimic and understand the generic behaviors of the micro-dynamics of liquids at the kinetic level. After our past studies on the micro-structures and motions in the 2D dusty plasma liquids, we started, in the past three years, the research on the thermal induced chain-dynamics in the 2+1 D chain bundle dusty plasma liquids using a digital stereo particle tacking system. The 2+1 D chain bundle dusty plasma liquid is constituted by the long vertical dust chains induced by dipole field through the vertical ion wake effect. It is a good platform to understand the generic micro-behavior of the 2+1 D chain bundle liquid such as the electro-rheological liquids, magnetic colloidal suspensions, polymer brushes, etc. We also investigated the particle micro-dynamics and particle-wave interaction in the large amplitude nonlinear dust acoustic wave and pulsed laser induced micro-plasma bubble in sub-excited dusty plasma liquids to shed light on the understanding of wave-particle dynamics for other nonlinear acoustic type wave excitations. In this new project, we will continue our researches on the 2+1 D chain bundle dusty plasma liquid. We will use laser induced external shear to investigate the propagation of the nonlinear transverse wave along the chain, shear induced chain breaking, the transient dynamics of quenching the system to the cold liquid or glassy state, and the predictability of the avalanche type structural rearrangement. On the other hand, we will further investigate the nonlinear wave dynamics such as the statistical features of dust acoustic wave turbulence, the particle-wave interaction in wave turbulence, the collective wave excitations by ultra-sonic intruders in the dusty plasma, the intruder-wave interaction, and the bubble-wave interactions, etc.. The studies on the above unexplored issues are not only important for the dusty plasma physics, but also should be able to shed some light on understanding the generic nonlinear behaviors in other corresponding nonlinear extended complex systems. The investigation will mainly be conducted experimentally. 研究期間：9908 ~ 10007
關聯:	財團法人國家實驗研究院科技政策研究與資訊中心
顯示於類別:	[物理學系] 研究計畫

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