簡易檢索 / 詳目顯示

回結果列表
研究生： 古承立
Ku, Cheng-Li
論文名稱： 從極短電子束團產生太赫茲同調渡越輻射之研究
Generation of THz Coherent Transition Radiation from Ultrashort Electron Pulses
指導教授： 柳克強
Leou, Keh-Chyang
劉偉強
Lau, Wai-Keung
口試委員: 張存續
Chang, Tsun-Hsu
周明昌
Chou, Ming-Chang
學位類別： 碩士
Master
系所名稱： 理學院 - 先進光源科技學位學程
Degree Program of Science and Technology of Synchrotron Light Source
論文出版年： 2017
畢業學年度： 106
語文別： 中文
論文頁數： 60
中文關鍵詞： 同調渡越輻射 、極短電子束 、太赫茲輻射
外文關鍵詞： coherent transition radiation, short electron bunch, terahertz
相關次數： 點閱：7  下載：0 
分享至:
查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報

    • 當相對論性電子束通過不同介質時，會在其介面處產生渡越輻射。當其產生的輻射波長長於電子束長時，則能夠產生同調渡越輻射。同調渡越輻射可以作為高強度遠紅外光、太赫茲輻射源，也能夠做飛秒等級的電子束長量測。本研究是利用國家同步輻射中心之高亮度直線加速器系統所產生之飛秒電子束進行太赫茲同調度越輻射實驗。我們預期產生的電子能量為33.5 MeV，電子電量為100 pC，束長為27 μm (~90飛秒)，所產生的同調渡越輻射頻率將落在太赫茲波段。
    實驗上使用鋁箔來產生太赫茲同調渡越輻射，其強度為289 nJ。我們利用干涉儀系統測量太赫茲輻射之脈寬長度為109.57μm。經傅立葉變換後獲得輻射頻譜，其頻譜範圍落在0.1-2 THz之內。

    When a relativistic electron bunch passes through two different media, transition radiation (TR) is generated from the interface. When the radiation wavelengths are much longer than the bunch length, coherent transition radiation (CTR) will be generated. CTR is high intensity far infrared radiation and terahertz radiation source. It can also be used for short electron bunch length measurements. In this study, the femtosecond electron beam generated by the NSRRC high brightness photoinjector linac system will be used for terahertz CTR experiments. We expect that the resulting CTR frequency will fall in the terahertz band when the electron beam energy is 33.5 MeV, bunch charge is 100 pC, and the beam length is 27 μm (~ 90 femtosecond). In our experiment, the CTR generated from a thin aluminum foil has a pulse energy of 289 nJ. The bunch length measured by the THz interferometer system is 154.94 μm. The radiation spectrum can be obtained from the Fourier transformation of the interferogram and its spectral range falls within 0.1-2 THz.

    摘要 i Abstract ii 致謝 iii 目錄 iv 第一章 簡介 1 1.1 研究背景 1 1.2 研究目的 3 第二章 文獻回顧 4 2.1 T. Takahashi, Y. Shibata 研究團隊[4-7] 4 2.2 C.S. Thongbai , T. Vilaithong研究團隊[8] 7 2.3 STANFORD Settakorn, Chitrlada[9] 12 2.3.1 分光鏡效率 12 2.3.2水氣對於太赫茲的吸收、散射影響 15 2.4 由同調渡越輻射產生可調窄帶的太赫茲脈衝[10] 18 2.5 藉由使用同調渡越輻射來量測自由電子雷射microbunching[11] 20 2.6 文獻回顧總結 23 第三章 研究原理 24 3.1渡越輻射(Transition Radiation)基本原理 24 3.2同調渡越輻射(Coherent Transition Radiation)基本原理 30 3.2.1前方向上的同調增強 32 3.2.2任意方向上的同調增強 33 第四章 實驗架設與儀器介紹 35 4.1 實驗架設示意圖 35 4.1.1探測電子束的位置 37 4.1.2量測太赫茲的能量 38 4.1.3量測太赫茲的光譜 39 4.2實驗架設流程圖 40 4.2.1實驗量測THz能量流程圖 40 4.2.2實驗量測THz干涉圖流程圖 40 4.3實驗儀器 43 4.3.1 CCD 43 4.3.2 Golay cell 43 4.3.3 移動平台 44 4.3.4 拋物面鏡 45 4.3.5 Filter 46 4.3.6 THz window 47 4.3.7 干涉儀 47 4.3.8 實驗總架設 49 4.4實驗參數 50 4.5實驗結果 52 4.5.1測量觀察到的輻射 53 4.5.2電子束團的束長量測 55 4.5.3同調渡越輻射頻譜 56 第五章 結論 58 參考文獻 59

    [1] G. P. Williams, "Compact, high-power, room-temperature, narrow-line terahertz source," Reports on Progress in Physics, vol. Volume 69, Number 2, 5 December 2005
    [2] 刘尚建, "太赫兹光谱与成像在生物医学领域中的应用," 物理, 2013 年.
    [3] 張存續, "高功率可調頻太赫茲波源," 物理雙月刊, 2009 年四月.
    [4] Y. Shibata, K. Ishi, T. Takahashi, F. Arai, M. Ikezawa, K. Takami, et al., "Observation of coherent synchrotron, Čerenkov, and wake-field radiation at millimeter wavelengths using anL-band linear accelerator," Physical Review A, vol. 44, pp. R3449-R3451, 1991.
    [5] Y. Shibata, K. Ishi, T. Takahashi, T. Kanai, M. Ikezawa, K. Takami, et al., "Observation of coherent transition radiation at millimeter and submillimeter wavelengths," Physical Review A, vol. 45, pp. R8340-R8343, 1992.
    [6] T. Takahashi, Y. Shibata, F. Arai, K. Ishi, T. Ohsaka, M. Ikezawa, et al., "Coherent transition radiation at submillimeter and millimeter wavelengths," Physical Review E, vol. 48, pp. 4674-4677, 1993.
    [7] Y. Shibata, T. Takahashi, T. Kanai, K. Ishi, M. Ikezawa, J. Ohkuma, et al., "Diagnostics of an electron beam of a linear accelerator using coherent transition radiation," Physical Review E, vol. 50, pp. 1479-1484, 1994.
    [8] C. S. Thongbai and T. Vilaithong, "Coherent transition radiation from short electron bunches," Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 581, pp. 874-881, 2007.
    [9] C. Settakorn, "Generation and Use of Coherent Transition Radiation from short electron bunches," Ph.D. thesis,Stanford University, 2001.
    [10] Y. Shen, "Generation of Tunable Narrowband Terahertz Pulses from Coherent Transition Radiation," Lasers and Electro-Optics (CLEO) 2012, OSA Technical Digest CTu1B.1.
    [11] A. Tremaine, "Measured free-electron laser microbunching using coherent transition radiation," Nuclear Instruments and Methods in Physics Research A, vol. 429, pp. 209-212, 1999.
    [12] V. Ginsburg and I. Frank, "Radiation of a uniformly moving electron due to its transition from one medium into another," Zhurnal Eksperimentalnoi I Teoreticheskoi Fiziki, vol. 16, pp. 15-28, 1946.
    [13] M. L. Ter-Mikaelian, High-energy Electromagnetic Process in Condensed Media. New York: Wiley-Interscience, 1972.
    [14] V. L. Ginzburg, "Transition Radiation and Transition Scattering," Physica Scripta., vol. T2/1, pp. 182-191, June 15, 1982.
    [15] U. Happek, A. J. Sievers, and E. B. Blum, "Observation of coherent transition radiation," Phys Rev Lett, vol. 67, pp. 2962-2965, Nov 18 1991.
    [16] H. Motz, "Applications of the Radiation from Fast Electron Beams," Journal of Applied Physics, vol. 22, pp. 527-535, 1951.
    [17] D. Klocke, A. Schmitz, H. Soltner, H. Bousack, and H. Schmitz, "Infrared receptors in pyrophilous ("fire loving") insects as model for new un-cooled infrared sensors," Beilstein J Nanotechnol, vol. 2, pp. 186-97, 2011.
    [18] H.-W. H. Erik Bründermann, Maurice FitzGerald Kimmitt, Terahertz Techniques. USA: Springer, 2012.
    [19] "http://phluxi.com/P91-2-002.pdf."
    [20] H.Lihn, "Stimulated coherent transition radiation," Ph.D. thesis,Stanford University, 1996.

    QR CODE