雷射產生電漿體中磁重聯的時間演化

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姓名

彭政偉(Cheng-wei Peng) 查詢紙本館藏

畢業系所

物理學系

論文名稱

雷射產生電漿體中磁重聯的時間演化
(Time Evolution of Magnetic Reconnection in Laser Produced Plasma)

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摘要(中)

磁重聯是在宇宙中的基本現象之ㄧ，在磁場為拓撲結構的磁重聯過程可以使磁能轉換為電漿的動能。在宇宙中有許多物理量不能直接量測，在實驗室中我們可以測量一些關鍵參數的磁重聯，並控制電漿和磁場參數。在實驗室裡的實驗可以是研究太空和天文物裡現象的一種工具。透過使用高功率脈衝雷射聚焦在固態靶上，分別讓雷射聚焦在固態把上的兩個平行點，磁泡會因此而產生在固態靶上並且隨著電漿流。我們透過不同方向的高度感光耦合元件以及多幀攝像機來當作光學診斷系統來量測電漿隨時間及空間的演變，從觀察兩個方向的電漿噴射的結構可以讓我們解釋三維空間中的電漿結構。我們可以在一系列隨著時間變化的自發輻射影像清楚看到橫向電漿噴流的結構，自生的磁場重新連接並且釋放磁場能量來轉換成電漿的動能在我們的實驗中被強烈證明。

摘要(英)

Magnetic reconnection is one of the fundamental phenomena in the universe. Magnetic reconnection can change topology of magnetic fields, where magnetic energy is converted to plasma kinetic energy. In the universe there are many physical quantities cannot be measured directly. In laboratory we can measure some of the key parameters in magnetic reconnections and also control plasma and magnetic field parameters. Laboratory experiment can be a tool to investigate space and astrophysical phenomena. By irradiating a solid target with high-power laser pulses with finite focal spot displacements, magnetic bubbles are generated, associating with plasma flows. We measure spatial and temporal plasma evolutions with optical diagnostics from multiple directions and using multi-framing camera. Observations of a plasma jet from two directions allow us to interpret the plasma structure in three dimensions. A series of self-emission images provides the time evolution of plasma structures where the transverse plasma jets clearly seen.　Our experimental results strongly indicate that self-generated magnetic fields reconnect and release the magnetic field energy as plasma kinetic energy.

關鍵字(中)

★ 磁重聯
★ 電漿
★ 雷射
★ 實驗室天文學

關鍵字(英)

★ Magnetic reconnection
★ Plasma
★ Laser
★ Laboratory astrophysics

論文目次

1 Introduction1
1.1Simpledescriptionofthemagneticreconnection..............1
1.2Classicalsolutionofmagneticrconnection.................4
1.3Sweet-Parkermodel..............................6
1.4Reconnectionrate...............................10
2 Physicalmodel12
2.1Biermanne¤ect................................12
2.2Self-generatedmagneticeldinlaser-soildinteraction...........13
3 Experimentalsetupanddiagnosticsystem19
3.1GEKKOXII-HIPERlasersystem......................19
3.2Experimentaldesignanddiagnosticsystem.................20
3.2.1Self-emissionimaging.........................27
3.2.2Shadowgraphy.............................29
3.2.3Mach-Zehnderinterferometer....................30
4 Result39
4.1Structureoflaserproducedplasmainselfemissionimages........39
4.2Structureoflaserproducedplasmaininterferograms...........48
4.3Structureoflaserproducedplasmainshadowgrams............55
4.4Calculatingexpandingvelocityofbrightspotinsidetheshock......57
5 Discussion65
5.1Alfvénvelocityinlaserproducedplasma..................65
5.2EstimatingtheconductivityofHydrocarbons(CH)plasma........67
5.3Sweet-Parkermagneticreconnectionintimescale.............68
6 Summary70
Bibliography72

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指導教授

藏滿康浩(Yasuhiro Kuramitsu)

審核日期

2016-4-22

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