Mapping the Ionization State of Laser-Irradiated Ar Gas Jets With Multi-Wavelength Monochromatic X-Ray Imaging

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Two-dimensional monochromatic images of fast-electron stimulated Ar K{alpha} and He-{alpha} x-ray self-emission have recorded a time-integrated map of the extent of Ar{sup {approx}6+} and Ar{sup 16+} ions, respectively, within a high density (10{sup 20} cm{sup -3} atomic density) Ar plasma. This plasma was produced by irradiating a 2 mm wide clustering Ar gas jet with an ultra-high intensity (10{sup 19} W/cm{sup 2}, 200 fs) Ti:Sapphire laser operating at 800 nm. Spherically bent quartz crystals in the 200 (for K{alpha}) and 201 (for He-{alpha}) planes were used as near-normal incidence reflective x-ray optics. We see that a large (830 {micro}m long) ... continued below

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Kugland, N L; Doppner, T; Kemp, A; Schaeffer, D; Glenzer, S H & Niemann, C April 8, 2010.

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Two-dimensional monochromatic images of fast-electron stimulated Ar K{alpha} and He-{alpha} x-ray self-emission have recorded a time-integrated map of the extent of Ar{sup {approx}6+} and Ar{sup 16+} ions, respectively, within a high density (10{sup 20} cm{sup -3} atomic density) Ar plasma. This plasma was produced by irradiating a 2 mm wide clustering Ar gas jet with an ultra-high intensity (10{sup 19} W/cm{sup 2}, 200 fs) Ti:Sapphire laser operating at 800 nm. Spherically bent quartz crystals in the 200 (for K{alpha}) and 201 (for He-{alpha}) planes were used as near-normal incidence reflective x-ray optics. We see that a large (830 {micro}m long) region of plasma emits K{alpha} primarily along the laser axis, while the He-{alpha} emission is confined to smaller hot spot (230 {micro}m long) region that likely corresponds to the focal volume of the f/8 laser beam. X-ray spectra from a Bragg spectrometer operating in the von Hamos geometry, which images in one dimension, indicate that the centroids of the K{alpha} and He-{alpha} emission regions are separated by approximately 330 {micro}m along the laser axis.

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PDF-file: 6 pages; size: 1.9 Mbytes

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  • Journal Name: Review of Scientific Instruments, vol. 81, no. 10, October 21, 2010, pp. 10E526; Journal Volume: 81; Journal Issue: 10

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  • Report No.: LLNL-JRNL-428351
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1009219
  • Archival Resource Key: ark:/67531/metadc830761

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  • April 8, 2010

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  • May 19, 2016, 3:16 p.m.

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  • Nov. 29, 2016, 7:27 p.m.

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Kugland, N L; Doppner, T; Kemp, A; Schaeffer, D; Glenzer, S H & Niemann, C. Mapping the Ionization State of Laser-Irradiated Ar Gas Jets With Multi-Wavelength Monochromatic X-Ray Imaging, article, April 8, 2010; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc830761/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.