Beat wave injection of electrons into plasma waves using two interfering laser pulses

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An electron injector concept that uses a single injection laser pulse colliding with a pump laser pulse in a plasma is analyzed. The pump pulse generates a large amplitude laser wakefield (plasma wave). The counter propagating injection pulse collides with the pump laser pulse to generate a beat wave with a slow phase velocity. The ponderomotive force of the slow beat wave is responsible for injecting plasma electrons into the wakefield near the back of the pump pulse. Test particle simulations indicate that significant amounts of charge can be trapped and accelerated ({approx} 10 pC). For higher charge, beam loading ... continued below

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29 pages

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Fubiani, G.; Esarey, E.; Schroeder, C.B. & Leemans, W.P. March 4, 2004.

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Description

An electron injector concept that uses a single injection laser pulse colliding with a pump laser pulse in a plasma is analyzed. The pump pulse generates a large amplitude laser wakefield (plasma wave). The counter propagating injection pulse collides with the pump laser pulse to generate a beat wave with a slow phase velocity. The ponderomotive force of the slow beat wave is responsible for injecting plasma electrons into the wakefield near the back of the pump pulse. Test particle simulations indicate that significant amounts of charge can be trapped and accelerated ({approx} 10 pC). For higher charge, beam loading limits the validity of the simulations. The accelerated bunches are ultrashort ({approx} 1 fs) with good beam quality (relative energy spread of a few percent at a mean energy of {approx} 10 MeV and a normalized rms emittance on the order 0.4 mm.mrad). The effects of interaction angle and polarization are also explored, e.g., efficient trapping can occur for near-collinear geometries. Beat wave injection using a single injection pulse has the advantages of simplicity, ease of experimental implementation, and requires modest laser intensity I {approx_equal} 8.8 x 10{sup 17} W/cm{sup 2}.

Physical Description

29 pages

Notes

INIS; OSTI as DE00835426

Source

  • Journal Name: Physical Review E; Journal Volume: 7001; Journal Issue: 1pt2; Other Information: Submitted to Physical Review E, Volume 7001, No.1, Part 2; Journal Publication Date: 07/2004

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  • Report No.: LBNL--54706
  • Report No.: CBP Note - 541
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 835426
  • Archival Resource Key: ark:/67531/metadc780056

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • March 4, 2004

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • April 4, 2016, 3:57 p.m.

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Fubiani, G.; Esarey, E.; Schroeder, C.B. & Leemans, W.P. Beat wave injection of electrons into plasma waves using two interfering laser pulses, article, March 4, 2004; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc780056/: accessed May 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.