經由高強度雷射引發尾場所產生的非熱效 應電子加速

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姓名

黃子翔(Tzu-Hsiang Huang) 查詢紙本館藏

畢業系所

物理學系

論文名稱

經由高強度雷射引發尾場所產生的非熱效應電子加速
(Nonthermal electron acceleration due to a wakefield induced by an intense laser)

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★ 雷射電漿中無碰撞激震波的全域與局域量測

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摘要(中)

在宇宙中的宇宙射線或含有能量的粒子所展現能譜的並非熱效應Maxwell分布，而是遵循著冪次定律而分布。為了解釋此非熱效應的宇宙射線能譜，科學家們提出各式各樣的加速機制。然而，我們難以直接從宇宙中的電漿直接測量到絕大部分的物理量，故我們使用高強度雷射系統去模擬宇宙中的空間與電漿來進行實驗。經由一百兆瓦的雷射照射後的氫氣靶材會因尾波加速機制產生非相對論性加速電子，這些被加速的電子可使用架設好的電子能譜儀 (ESM) 所測，而電漿的尾波結構也可以透過影圖與干涉儀觀測到。

摘要(英)

Cosmic rays in the universe show power law distributions rather than the Maxwell-Boltzmann distribution. Acceleration mechanisms have been proposed to explain the ultrahigh energy cosmic rays, and wakefield acceleration is one of candidates. However, many fundamental physical quantities are highly challenging to be measured directly in astrophysical plasmas. We use the 100 TW laser facility at the National Central University. By irradiating hydrogen gas jet with the 100 TW laser, relativistic electrons are generated by wakefield acceleration. The accelerated electrons are detected with electron spectrometer, and the plasma structures associated with the wakefields are observed with shadowgraphy. We integrate the energy distribution functions over different shots. The energy distribution functions of energetic electrons show nonthermal tails well represented by power law.

關鍵字(中)

★ 宇宙射線
★ 冪律
★ 尾場加速
★ 雷射
★ 電漿

關鍵字(英)

★ Comic ray
★ power law
★ wakefield acceleration
★ laser
★ plasma

論文目次

1 Introduction 1
1.1 Cosmic ray.......................1
1.2 First-order Fermi acceleration (Diffusive shock acceleration).........................3
1.3 wakefield acceleration...........4

2. Experimental setup 7
2.1 Laser system.....................7
2.2 Setup in station.................7
2.2.1 Off-axis parabolic mirror.....8
2.2.2 Relay-imaging system..........10
2.2.3 Shadowgraphy..................10
2.2.4 Electron spectrometer.........12

3. Experimental results...............17
3.1 Zero displacement................17
3.2 Gas density calibration..........19
3.3 Analysis.........................22
3.3.1 Energy interval in logarithmic scale........23
3.3.2 Consider a pixel as an energy interval......25
3.3.3 Plasma channel in Shadowgraphy..............30

4. Discussion and Summary.............39
4.1 Discussion.......................39
4.2 Summary..........................40

Bibliography 41

參考文獻

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指導教授

朱旭新藏滿康浩(Hsu-Hsin Chu Yasuhiro Kuromitsu)

審核日期

2018-8-17

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