Experiments and simulations of tunnel-ionized plasmas

Leemans, W.P.; Clayton, C. E.; Mori, W. B.; Marsh, K. A.; Kaw, P. K.; Dyson, A.; Joshi, C.; Wallace, Jessica

doi:10.1103/physreva.46.1091

Cited by 184 publications

(96 citation statements)

References 31 publications

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“…A 60 fs, 15 mJ ignitor pulse was focused at f/15 near the downstream edge of the gas jet. The focal location and f/number were chosen so that beam convergence roughly balanced ionization induced refraction [33,34], producing a cylindrical plasma of nearly uniform radius. This plasma was subsequently heated to tens of eV by inverse Bremsstrahlung using ∼ 50 mJ from a 250 ps, 150 mJ pulse cylindrically focused and incident on the jet from the side.…”

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confidence: 99%

Guiding of Relativistic Laser Pulses by Preformed Plasma Channels

et al. 2005

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Guiding of relativistically intense ( > 10 18 W/cm 2 ) laser pulses over more than 10 diffraction lengths has been demonstrated using plasma channels formed by hydrodynamic shock. Pulses up to twice the self guiding threshold power were guided without aberration by tuning the guide profile. Transmitted spectra and mode images showed the pulse remained in the channel over the entire length. Experiments varying guided mode power and simulations show a large plasma wave was driven. Operating just below the trapping threshold produces a dark current free structure suitable for controlled injection.

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Guiding of Relativistic Laser Pulses by Preformed Plasma Channels

et al. 2005

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“…From these measurements, the guided intensity was between 10 18 and 2.5 × 10 18 W/cm 2 , with the lower limit set by the 12 µm mode imager observation and the upper limit set by the input spot size. In the absence of any plasma, a large mode size consistent with vacuum diffraction is observed (c), and with the gas jet on but the channel off (d) diffraction is increased by ionization effects (Rankin et al 1991;Leemans et al 1992), showing that self guiding alone is insufficient to efficiently guide the beam. Energy transmission at 4 TW was 35%, a reduction of one third from the low power case at 0.5 TW, indicating that substantial power was deposited in plasma waves.…”

Section: (B) Guiding Relativistic Intensities In Plasma Channelsmentioning

confidence: 95%

Laser guiding for GeV laser–plasma accelerators

Leemans

Esarey

Geddes

et al. 2006

Phil. Trans. R. Soc. A.

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Guiding of relativistically intense laser beams in preformed plasma channels is discussed for development of GeV-class laser accelerators. Experiments using a channel guided laser wakefield accelerator (LWFA) at LBNL have demonstrated that near mono-energetic 100 MeV-class electron beams can be produced with a 10 TW laser system. Analysis, aided by particle-in-cell simulations, as well as experiments with various plasma lengths and densities, indicate that tailoring the length of the accelerator, together with loading of the accelerating structure with beam, is the key to production of mono-energetic electron beams. Increasing the energy towards a GeV and beyond will require reducing the plasma density and design criteria are discussed for an optimized accelerator module. The current progress and future directions are summarized through comparison with conventional accelerators, highlighting the unique short term prospects for intense radiation sources based on laser-driven plasma accelerators.

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“…Hence, the guided intensity is between 10 18 and 2.5x10 18 W/cm 2 with the lower limit set by the 12µm mode imager observation and the upper limit set by the input spot size. In the absence of any plasma, a large mode size consistent with vacuum diffraction is observed (c), and with the gas jet on but the channel off (d) diffraction is increased by ionization effects [45,46], showing that self guiding alone is insufficient to efficiently guide the beam.…”

Section: Guiding Relativistic Intensities In Preformed Plasma Channelsmentioning

confidence: 95%

Advances in Laser Driven Accelerator R&D

Leemans

2004

AIP Conference Proceedings

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Abstract. Current activities (last few years) at different laboratories, towards the development of a laser wakefield accelerator (LWFA) are reviewed, followed by a more in depth discussion of results obtained at the L'OASIS laboratory of LBNL. Recent results on laser guiding of relativistically intense beams in preformed plasma channels are discussed. The observation of mono-energetic beams in the 100 MeV energy range, produced by a channel guided LWFA at LBNL, is described and compared to results obtained in the unguided case at LOA, RAL and LBNL. Analysis, aided by particle-in-cell simulations, as well as experiments with various plasma lengths and densities, indicate that tailoring the length of the accelerator has a very beneficial impact on the electron energy distribution. Progress on laser triggered injection is reviewed. Results are presented on measurements of bunch duration and emittance of the accelerated electron beams, that indicate the possibility of generating femtosecond duration electron bunches. Future challenges and plans towards the development of a 1 GeV LWFA module are discussed.

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Experiments and simulations of tunnel-ionized plasmas

Cited by 184 publications

References 31 publications

Guiding of Relativistic Laser Pulses by Preformed Plasma Channels

Guiding of Relativistic Laser Pulses by Preformed Plasma Channels

Laser guiding for GeV laser–plasma accelerators

Advances in Laser Driven Accelerator R&D

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