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Design and Experimental Considerations for Multi-stage Laser Driven Particle Accelerator at 1 μ m Driving Wavelength

ORION Workshop Feb.18-20,2003. Design and Experimental Considerations for Multi-stage Laser Driven Particle Accelerator at 1 μ m Driving Wavelength. Y.Y. Lin( 林元堯） , A.C. Chiang （蔣安忠） , Y.C. Huang （黃衍介） Department of Electrical Engineering, National Tsing Hua University, Hsinchu,300, Taiwan.

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Design and Experimental Considerations for Multi-stage Laser Driven Particle Accelerator at 1 μ m Driving Wavelength

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  1. ORION Workshop Feb.18-20,2003 Design and Experimental Considerations for Multi-stage Laser Driven Particle Accelerator at 1μm Driving Wavelength Y.Y. Lin(林元堯）, A.C. Chiang（蔣安忠）, Y.C. Huang（黃衍介） Department of Electrical Engineering, National Tsing Hua University, Hsinchu,300, Taiwan NTHU Relativistic Photon-Electron Dynamics Laboratory

  2. OUTLINE • Motivation • Review on the multi-stage CO2-laser-acceleration Project at ATF BNL • Scaled to 1-μm Wavelength • A Proposed Muti-stage Experiment at ORION NTHU Relativistic Photon-Electron Dynamics Laboratory

  3. MOTIVATION • 10-μm Wavelength using 70 MeV beam at ATF BNL a. large structure size b. high-power CO2 laser available at ATF c. easier for alignment d. good for proof-of-principle experiment • 1-μm Wavelength using 350 MeV beam at ORION a. higher material damage field with 1-μm wavelength b. higher laser damage threshold with ~100 fs laser pulse c. smaller phase slip with 350 MeV beam d. smaller beam size for electron transmission aperture e. higher acceleration gradient f. solid-state laser stability and efficiency NTHU Relativistic Photon-Electron Dynamics Laboratory

  4. CO2-laser-acceleration Project at ATF BNL Lens-array structure (I):Accelerating Stages Laser beam waist ~280μm 1.5cm f=5z0/3=3.81cm Electron transit on each lens is 100μm in diameter 2/3*z0 24 cm = 15cm x 16 Each lens’ temperature is varied independently by a TE cooler Ref: E.J. Bochove, G.T. Moor, ad M. O. Scully, Phy. Rev. A, Vo. 46, No. 10 ,pp. 6640-53,Nov. 1992 NTHU Relativistic Photon-Electron Dynamics Laboratory

  5. CO2-laser-acceleration Project at ATF BNL TEM01 Mode filter Phase offset TEM00 W0= 104mm Lens-array structure (II): System setup of the multi-stage lens array accelerator structure E_max=132M V/m Energy gain=240 keV f=10” 100 mm 30.48 cm W0= 2000 mm Chamber f=2” 120 mm f=0.5” f=3” Iris & mirror iris Accelerator cell W0= 280 mm Si detector (movable) 120 mm 24 cm 5.32 cm 9.19 cm 2 cm 48.15 cm NTHU Relativistic Photon-Electron Dynamics Laboratory

  6. CO2-laser-acceleration Project at ATF BNL Numerical simulation for 1st stage NTHU Relativistic Photon-Electron Dynamics Laboratory

  7. CO2-laser-acceleration Project at ATF BNL Numerical simulation for 2nd stage NTHU Relativistic Photon-Electron Dynamics Laboratory

  8. CO2-laser-acceleration Project at ATF BNL Lens-array structure (III): Energy Gain along axis Damage threshold: 0.45 J/cm2 for ZnSe and 1.2 J/cm2 for CVD diamond Total energy Gain over 24 cm: 240 keV (ZnSe) 400 keV (CVD diamond) NTHU Relativistic Photon-electronics dynamic Laboratory

  9. CO2-laser-acceleration Project at ATF BNL Lens-array structure (IV): The Design Parameters for the Multistage Accelerator at ATF BNL NTHU Relativistic Photon-Electron Dynamics Laboratory

  10. CO2-laser-acceleration Project at ATF BNL Lens array structure at (V):Temperature phase tuning B.S. Mirror laser HeNe Si detector (det210) iris L1 Mirror TE cooler B.S. L1: ZnSe lens temperature controlled by TE cooler NTHU Relativistic Photon-Electron Dynamics Laboratory

  11. CO2-laser-acceleration Project at ATF BNL Lens array resonator structure at (V):Phase tuning over temperature experiment ,where d is the thickness of lens(~0.98mm), and λ0 is the wavelength of He-Ne laser in vacuum (~632.8nm) For 10.6 um Or NTHU Relativistic Photon-Electron Dynamics Laboratory

  12. Scaled to 1 m wavelength at ORION • Formation/coherence length ~ γ2λ • Acceleration field ~ √(damage threshold) NTHU Relativistic Photon-Electron Dynamics Laboratory

  13. A Proposed Muti-stage Experiment at ORION Lens-array structure (I): The Design Parameters for the Multistage Accelerator NTHU Relativistic Photon-Electron Dynamics Laboratory

  14. Quantities to be Measured • 1. Coherent transition radiation by tuning the optical phase on individual lens  wake field impedance • 2. Multistage phase control • 3. Acceleration energy gain and gradient A Proposed Muti-stage Experiment at ORION

  15. A Proposed Muti-stage Experiment at ORION Summary Table of Laser Acceleration Project at ORION (I) Electron beam parameter NTHU Relativistic Photon-Electron Dynamics Laboratory

  16. A Proposed Muti-stage Experiment at ORION Summary Table of Laser Acceleration Project at ORION (II) Laser beam parameters NTHU Relativistic Photon-Electron Dynamics Laboratory

  17. A Proposed Muti-stage Experiment at ORION Summary Table of Laser Acceleration Project at ORION (III) Electron Beam Diagnostics Laser Beam Diagnostics: power, pulse width, wavelength etc. NTHU Relativistic Photon-Electron Dynamics Laboratory

  18. Summary • The 1 MeV/m Multi-stage CO2-laser-acceleration Project at ATF BNL is a proof-of-principle experiment for vacuum acceleration • ORION facility is suitable for high-gradient, small-size vacuum acceleration. • With 350 MeV beam, 1 μm wavelength, and 100 fsec laser pulse width, an acceleration gradient of 280 MeV/m can be obtained near the material damage. • The electron energy gain from the proposed 14 accelerator stages is 3.6 MeV over a overall accelerator length of 1.3 cm. NTHU Relativistic Photon-Electron Dynamics Laboratory

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