An analysis of x-rays emitted from laser-produced noble gas jet plasmas and a comparison of gas jet nozzles

ORAL

Abstract

The study of fs laser interaction with underdense gas jet plasmas is important for understanding the mechanisms of x-ray (1-20keV) emission. Clusterized gas jets produced by a linear supersonic nozzle were irradiated with a high-intensity laser pulse generated by the UNR Leopard laser (at 1-2x10$^{\mathrm{19}}$W/cm$^{\mathrm{2}})$. Jets of Ar, Kr, and Xe were studied as well as triple mixtures with different percentages of each of the noble gases. Absolute x-ray outputs of the laser-gas jet interactions measured by PCDs are presented and show a strong anisotropy of x-ray radiation with respect to laser beam polarization direction. The triple mixtures each exhibited a higher x-ray yield compared to pure gases and a factor of 10$^{\mathrm{-3}}$ of laser energy was converted into x-rays. Characterization of gas jets was also performed at the Radiation Physics Laboratory at UNR using interferometry and Rayleigh scattering. The combination of density and cluster measurements results in the calculation of the cluster parameter $\eta $N$_{\mathrm{c}}$. The characterization was performed for the linear supersonic nozzle and a new, complex conical nozzle with applications in Z-pinch and laser-produced plasma research. The linear nozzle has a larger line-integrated density.

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Authors

  • K.A. Schultz

    Physics Department, University of Nevada, Reno

  • V.L. Kantsyrev

    Physics Department of the University of Nevada, Reno, Physics Department, University of Nevada, Reno

  • V.V. Shlyaptseva

    Physics Department of the University of Nevada, Reno, Physics Department, University of Nevada, Reno

  • I.K. Shrestha

    Physics Department of the University of Nevada, Reno, University of Nevada, Reno, Physics Department, University of Nevada, Reno

  • E.E. Petkov

    Physics Department of the University of Nevada, Reno, Univ of Nevada - Reno, Physics Department, University of Nevada, Reno

  • A.S. Safronova

    Physics Department of the University of Nevada, Reno, University of Nevada, Reno, Physics Department, University of Nevada, Reno

  • Chi-Yu Hu

    University of California - Berkeley, National Institute for Materials Science, Caifornia State University, Long Beach, University of Michigan, Stockholm University, California State University, Long Beach, Utrecht University, Carl von Ossietzky University of Oldenburg, Germany, Hartnell Community College, Department of Physics, Stockholm University, GRAPPA, University of Amsterdam, Paul Scherrer Institute, Switzerland, California State University, Fresno, California State University Long Beach, Cal State Univ- Long Beach, University of Nevada, Reno, University of Rogensberg, Germany, Tribhuvan University, Nepal, University of Victoria and Perimeter Institute for Theoretical Physics, Institute of Physics, Jagiellonian University, Helmholtz Institute Mainz, Johannes Gutenberg University, Physics Department of the University of Nevada, Reno, Universita del Sannio, Cal Tech, California State University, Los Angeles, Univ of California - San Diego, UC Berkeley, Lawrence Livermore National Laboratory, Department of Physics & Astronomy, University of California, Irvine 92617, Department of Chemistry and of Physics & Astronomy, University of California, Irvine 92617, SLAC National Laboratory, Humboldt State University, Physics Department, University of Nevada, Reno, Univ of California - Merced

  • A. Stafford

    Physics Department of the University of Nevada, Reno, University of Nevada, Reno, Physics Department, University of Nevada, Reno

  • M.C. Cooper

    University of Nevada, Reno, Physics Department, University of Nevada, Reno