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Title: Direct Acceleration of Electrons in a Corrugated Plasma Channel

Abstract

Direct laser acceleration of electrons provides a low power tabletop alternative to laser wakefield accelerators. Until recently, however, direct acceleration has been limited by diffraction, phase matching, and material damage thresholds. The development of the corrugated plasma channel [B. Layer et al., Phys. Rev. Lett. 99, 035001 (2007)] has removed all of these limitations and promises to allow direct acceleration of electrons over many centimeters at high gradients using femtosecond lasers [A. G. York et al., Phys Rev. Lett 100, 195001 (2008), J. P. Palastro et al., Phys. Rev. E 77, 036405 (2008)]. We present a simple analytic model of laser propagation in a corrugated plasma channel and examine the laser-electron beam interaction. Simulations show accelerating gradients of several hundred MeV/cm for laser powers much lower than required by standard laser wakefield schemes. In addition, the laser provides a transverse force that confines the high energy electrons on axis, while expelling low energy electrons.

Authors:
 [1];  [2]; ; ; ; ; ;  [1];  [3]
  1. Institute for Research in Electrical and Applied Physics, University of Maryland, College Park, MD 20740 (United States)
  2. (United States)
  3. Lawrence Livermore National Laboratory Livermore, CA 94550 (United States)
Publication Date:
OSTI Identifier:
21255224
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1086; Journal Issue: 1; Conference: 13. advanced accelerator concepts workshop, Santa Cruz, CA (United States), 27 Jul - 2 Aug 2008; Other Information: DOI: 10.1063/1.3080910; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABLATION; ACCELERATION; CONTROL SYSTEMS; DIFFRACTION; ELECTRON BEAMS; ELECTRONS; LASERS; MEV RANGE 100-1000; PLASMA; PLASMA PRODUCTION; SIMULATION; WAKEFIELD ACCELERATORS

Citation Formats

Palastro, J. P., Lawrence Livermore National Laboratory Livermore, CA 94550, Antonsen, T. M., Morshed, S., York, A. G., Layer, B., Aubuchon, M., Milchberg, H. M., and Froula, D. H. Direct Acceleration of Electrons in a Corrugated Plasma Channel. United States: N. p., 2009. Web. doi:10.1063/1.3080910.
Palastro, J. P., Lawrence Livermore National Laboratory Livermore, CA 94550, Antonsen, T. M., Morshed, S., York, A. G., Layer, B., Aubuchon, M., Milchberg, H. M., & Froula, D. H. Direct Acceleration of Electrons in a Corrugated Plasma Channel. United States. doi:10.1063/1.3080910.
Palastro, J. P., Lawrence Livermore National Laboratory Livermore, CA 94550, Antonsen, T. M., Morshed, S., York, A. G., Layer, B., Aubuchon, M., Milchberg, H. M., and Froula, D. H. 2009. "Direct Acceleration of Electrons in a Corrugated Plasma Channel". United States. doi:10.1063/1.3080910.
@article{osti_21255224,
title = {Direct Acceleration of Electrons in a Corrugated Plasma Channel},
author = {Palastro, J. P. and Lawrence Livermore National Laboratory Livermore, CA 94550 and Antonsen, T. M. and Morshed, S. and York, A. G. and Layer, B. and Aubuchon, M. and Milchberg, H. M. and Froula, D. H.},
abstractNote = {Direct laser acceleration of electrons provides a low power tabletop alternative to laser wakefield accelerators. Until recently, however, direct acceleration has been limited by diffraction, phase matching, and material damage thresholds. The development of the corrugated plasma channel [B. Layer et al., Phys. Rev. Lett. 99, 035001 (2007)] has removed all of these limitations and promises to allow direct acceleration of electrons over many centimeters at high gradients using femtosecond lasers [A. G. York et al., Phys Rev. Lett 100, 195001 (2008), J. P. Palastro et al., Phys. Rev. E 77, 036405 (2008)]. We present a simple analytic model of laser propagation in a corrugated plasma channel and examine the laser-electron beam interaction. Simulations show accelerating gradients of several hundred MeV/cm for laser powers much lower than required by standard laser wakefield schemes. In addition, the laser provides a transverse force that confines the high energy electrons on axis, while expelling low energy electrons.},
doi = {10.1063/1.3080910},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1086,
place = {United States},
year = 2009,
month = 1
}
  • Historically, direct acceleration of charged particles by electromagnetic fields has been limited by diffraction, phase matching, and material damage thresholds. A recently developed plasma micro-optic [B. Layer et al., Phys. Rev. Lett. 99, 035001 (2007)] removes these limitations and promises to allow high-field acceleration of electrons over many centimeters using relatively small femtosecond lasers. We present simulations that show a laser pulse power of 1.9 TW should allow an acceleration gradient larger than 80 MV/cm. A modest power of only 30 GW would still allow acceleration gradients in excess of 10 MV/cm.
  • The corrugated plasma channel allows micron-scale control of the intensity and phase velocity of a guided intense femtosecond laser pulse. Direct electron acceleration by a radially polarized laser pulse can be achieved by quasi-phase matching in these channels.
  • The generation of quasimonoenergetic electron beams, with energies up to 200 MeV, by a laser-plasma accelerator driven in a hydrogen-filled capillary discharge waveguide is investigated. Injection and acceleration of electrons is found to depend sensitively on the delay between the onset of the discharge current and the arrival of the laser pulse. A comparison of spectroscopic and interferometric measurements suggests that injection is assisted by laser ionization of atoms or ions within the channel.
  • Refluxed electrons direct laser acceleration is proposed so as to generate a high-charge energetic electron beam. When a laser pulse is incident on a relativistic critical density target, the rising edge of the pulse heats the target and the sheath fields on the both sides of the target reflux some electrons inside the expanding target. These electrons can be trapped and accelerated due to the self-transparency and the negative longitudinal electrostatic field in the expanding target. Some of the electrons can be accelerated to energies exceeding the ponderomotive limit 1/2a{sub 0}{sup 2}mc{sup 2}. Effective temperature significantly above the ponderomotive scalingmore » is observed. Furthermore, due to the limited expanding length, the laser propagating instabilities are suppressed in the interaction. Thus, high collimated beams with tens of μC charge can be generated.« less