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All-Optical Injection Donald Umstadter

AAC, Santa Fe, NM, 2000. All-Optical Injection Donald Umstadter. Supported by the High-Energy Physics Division of the U.S. Department of Energy and the National Science Foundation. Low-divergence Self-trapped MeV Beam.  = 1  10 10 e -.

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All-Optical Injection Donald Umstadter

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  1. AAC, Santa Fe, NM, 2000 All-Optical Injection Donald Umstadter Supported by the High-Energy Physics Division of the U.S. Department of Energy and the National Science Foundation.

  2. Low-divergence Self-trapped MeV Beam  = 1 1010 e-

  3. Electron beam profiles for various laser powers: multiple components Phys. of Plasmas, 7, 403 (2000).

  4. Two-temperature Distribution

  5. Slope of Distribution “Jumps” with Density or Laser Power

  6. Laser Injected Laser Accelerator: LILAC

  7. Various LILAC Concepts • D. Umstadter et al., Phys. Rev. Lett.76, 2073 (1996). • Ponderomotive kick w/ or w/o ionization • E. Esarey et al.,Phys. Rev. Lett. 79, 2682 (1997). • Beatwave ponderomotive kick • B. Rau et al.,Phys. Rev. Lett. 78, 3310 (1997). • Half-cycle pulse, sharp density gradient • R. G. Hemker et al.,Phys. Rev. E57, 5920 (1998). • Colliding wakes • S.V. Bulanov,Plasma Phys. Rep.25, 468 (1999). • Sharp density gradient • C.I. Moore et al.,Phys. Rev. Lett.82, 1688 (1999). • Ionization

  8. 150-terawatt Laser Construction. • Preamplifier and cleaner • Large aperture high energy (~100mJ) regenerative amplifier • 15J green pump laser.

  9. Current kHz Laser • Intensity • 3x1018W/cm2 • Pulse Duration • 8 to 21 fs • PulseEnergy • 3 mJ (21fs) • Focal Spot Size • 1mm 1.2 mm Intensity Efocused/Etotal=83%

  10. Summary of Our Experimental Observations • Electron acceleration in a relativistically self-guided plasma channel • Electron beam: D = 1°, e = 0.06 pmm-mrad • Multiple electron beam components explained • Relativistic filamentation and electron acceleration w/o significant Raman scatter • Proton Acceleration by vacuum heating • Measured acceleration gradients • 2 GeV/cm (108 A/cm2)

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