Laser Wakefield Acceleration at Reduced Density in the Self-Guided Regime

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Experiments conducted using a 200TW 60 fs laser have demonstrated up to 720 MeV electrons in the self-guided laser wakefield regime using pure Helium gas jet targets. Charge and energy of the accelerated electrons was measured using an electron spectrometer with a 0.5T magnet and charge callibrated image plates. The self-trapped charge in a helium plasma was shown to fall off with decreasing electron density with a threshold at 2.5 x 10{sup 18} (cm{sup -3}) below which no charge is trapped. Self-guiding however is shown to continue below this density limitation over distances of 14 mm with an exit spot ... continued below

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PDF-file: 13 pages; size: 3.4 Mbytes

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Ralph, J E; Albert, F; Glenzer, S H; Palastro, J P; Pollock, B B; Shaw, J L et al. November 18, 2009.

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Experiments conducted using a 200TW 60 fs laser have demonstrated up to 720 MeV electrons in the self-guided laser wakefield regime using pure Helium gas jet targets. Charge and energy of the accelerated electrons was measured using an electron spectrometer with a 0.5T magnet and charge callibrated image plates. The self-trapped charge in a helium plasma was shown to fall off with decreasing electron density with a threshold at 2.5 x 10{sup 18} (cm{sup -3}) below which no charge is trapped. Self-guiding however is shown to continue below this density limitation over distances of 14 mm with an exit spot size of 25{micro}m. Simulations show that injection of electrons at these densities can be assisted through ionization induced trapping in a mix of Helium with 3% Oxygen.

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PDF-file: 13 pages; size: 3.4 Mbytes

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  • Journal Name: Physics of Plasmas, vol. 17, no. 5, April 22, 2010, pp. 056709/1-6; Journal Volume: 17; Journal Issue: 5

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  • Report No.: LLNL-JRNL-420517
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 986058
  • Archival Resource Key: ark:/67531/metadc1013091

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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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  • November 18, 2009

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  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 27, 2017, 5:36 p.m.

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Ralph, J E; Albert, F; Glenzer, S H; Palastro, J P; Pollock, B B; Shaw, J L et al. Laser Wakefield Acceleration at Reduced Density in the Self-Guided Regime, article, November 18, 2009; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc1013091/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.