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ACCELERATING ELECTRONS WITH LIGHT

ACCELERATING ELECTRONS WITH LIGHT. Laser-Based Acceleration of Nonrelativistic Electrons at a Dielectric Structure ( Phys. Rev. Lett.  111 , 134803 (2013) ) John Breuer Peter Hommelhoff. Reporter ：吳艾凌 10/31.2013. 大綱. 前言. 目前加速器. 原理 + 條件.

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ACCELERATING ELECTRONS WITH LIGHT

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  1. ACCELERATING ELECTRONS WITH LIGHT Laser-Based Acceleration of Nonrelativistic Electrons at a Dielectric Structure (Phys. Rev. Lett. 111, 134803 (2013)) John Breuer Peter Hommelhoff Reporter：吳艾凌 10/31.2013

  2. 大綱 前言 目前加速器 原理+條件 儀器 未來設計 模擬圖 發展限制

  3. 前言 • 用熔融石英作為光柵來加速非相對論性的電子實驗已經發表了 →光柵是用來產生和電子同週期的的電磁波並有效率的傳導動量(Max：25MeV/m) • Many simulations • all-optical compact accelerator

  4. - + + - - + - + - + 現今的加速器 • NOW： Radio frequency e- e- e- 20-50MeV http://www.antonine-education.co.uk/Salters/PRO/Accelerators.htm

  5. 使用/設計中加速器 http://www.ihep.ac.cn/kejiyuandi/news/LC-ALL/LC-ALL1.gifhttp://upload.wikimedia.org/wikipedia/commons/d/dd/ILC_SchemeTDR.jpg ILC 100MeV/m

  6. 研究中 • 用可見光+介電材料可比用金屬承受約100倍大的場強度，若加強場(短脈衝)那dielectric laser acclerators(DLAs)加速度梯度可達~GeV/m

  7. 用振盪場加速帶電粒子 • 條件：1.電磁波Vp=粒子速度 2.電場分量和粒子行進方向平行

  8. 目前雷射加速採用： • 電漿波的縱向電場 • 高集中的雷射 →但是加速模態下Vp達不到光速 所以相對性粒子只能加速小距離，可達到的 能量便受限

  9. 光柵的利用 • 用光柵的近場可以連續加速相對性和非相對性粒子(光柵修正振盪場，和現今加速器相似) • 單光柵→非相對性粒子 (inverse Smith-Purcell effect) • 雙光柵(光柵面對面)→相對論性粒子

  10. →光柵週期(長)(m) → sychronicity condition 同步條件sychronicity condition • n階諧波就振盪n次(每個光柵) 且

  11. n=1 Laser n=3

  12. SEM 脈衝

  13. 各項變數對電子加速比率的關係

  14. →11.2μm MAX Ep=2.85GV/m Ep=2.36GV/m

  15. 60nm away from grating surface 模擬 量測

  16. 50nm away from grating surface MAX:350MeV/m n=1 MAX:1.75GeV/m n=3 0.3 0.95

  17. 電子槍 Fiber-based laser nonrelativistic relativistic

  18. 目前發展限制 • DLA需要做的很小 • 光纖雷射的發展 • 單/雙光柵的取捨 • 電子束的品質(FELs)

  19. Scanning Electron Microscope(SEM) http://www.materialsnet.com.tw/AD/ADImages/AAADDD/MCLM100/download/equipment/EM/FE-SEM/FE-SEM005.pdf

  20. Ti:Sapphire laser • 波長輸出範圍在650到1100nm →紅外光 • 四階的電子震動雷射 • 功率較大 • 輸出頻率穩定 • 極短脈衝→不必擔心反射的脈衝干擾

  21. Thanks for your attention!

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