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研究生:黃子翔
研究生(外文):Tzu-Hsiang Huang
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
論文名稱(外文):Nonthermal electron acceleration due to a wakefield induced by an intense laser
指導教授:朱旭新藏滿康浩
指導教授(外文):Hsu-Hsin ChuYasuhiro Kuromitsu
學位類別:碩士
校院名稱:國立中央大學
系所名稱:物理學系
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:2018
畢業學年度:106
語文別:英文
論文頁數:58
中文關鍵詞:宇宙射線冪律尾場加速雷射電漿
外文關鍵詞:Comic raypower lawwakefield accelerationlaserplasma
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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。
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.
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
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[7] E.fermi. "On the Origin of the Cosmic Radiation", Physical Review,(1949), p.1169-1174.
[8] Y. Kuramitsu, Y. Sakawa, T. Kato, H. Takaba. "Nonthermal acceleration of charged particles due to an incoherent wakeeld induced by a large-amplitude light pulse, APJL 682, 113-116, 2008.
[9] Y. Kuramitsu, Y. Sakawa, M. Hoshino, S.-H. Chen, H. Takabe. "On the universality of nonthermal electron acceleration due to quasi-turbulent wakeelds", High Energy Density Physics 8, 266-270, 2012.
[10] M. Hoshino. Wakeeld Acceleration by Radiation Pressure in Relativistic Shock Waves", Astrophysical Journal,v672,940-956, 2008.
[11] P. Chen, T. Tajima, Y. Takahashi. "Plama Wakeeld Acceleration for Ultrahigh-Energy Cosmic Rays", Physical Review Letters, v89, 2002.
[12] Y. Kuramitsu, N. Nakanii, K. Kondo, Y. Sakawa, Y. Mori, E. Miura, K. Tsuji, K. Kimura, S. Fukumochi, M. Kashihara, T. Tanimoto, H. Nakamura, T. Ishikura, K. Takeda, M. Tampo, R. Kodama, Y. Kitagawa, K. Mima, K. A. Tanaka, M. Hoshino, H. Takaba. "Model experiment of cosmic ray acceleration due to an incoherent wakeeld induced by an intense laser pulse", Physics of Plasma 18, 010701, 2011.
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[14] Y.L. Liu, Y. Kuramitsub, T. Moritakac, S.H. Chen. "Transition from coherent to incoherent acceleration of nonthermal relativistic electron induced by an intense light pulse", High Energy Density Physics 22, 46-50, 2017.
[15] The introduction of High-Field Physics and Ultrafast Technology Laboratory : http://hfp.phy.ncu.edu.tw/en/research/facilities/100-TW
[16] Film-screen systems and KODAK LANEX screens, Eastman Kodak Company, 2005.
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