skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Hot Surface Ionic Line Emission and Cold K-Inner Shell Emission from Petawatt-Laser-Irradiated Cu Foil Targets

Abstract

A hot, 2 to 3 keV electron temperature surface plasma was observed in the interaction of a 0.7 ps petawatt laser beam with solid copper-foil targets at intensities >10^20 W/cm^2. Copper K-shell spectra were measured in the range of 8 to 9 keV using a single-photon-counting x-ray charged-coupled-device camera. In addition to K-sub alpha and K-sub beta inner shell lines, the emission contained the Cu He-sub alpha and Ly-sub alpha lines, allowing the temperature to be inferred. Measurements of the absolute K-sub alpha yield as a function of the laser intensity are in general agreement with a model that inlcudes refluxing and confinement of the suprathermal electrons in the target volume.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »; ; ; ; ; ; ; ; ; ; ; ; « less
Publication Date:
Research Org.:
Laboratory for Laser Energetics, University of Rochester, Rochester, NY
Sponsoring Org.:
USDOE
OSTI Identifier:
881716
Report Number(s):
DOE/SF/19460-665
1627; 2005-142
DOE Contract Number:
FC52-92SF19460
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 13
Country of Publication:
United States
Language:
English

Citation Formats

Theobald, W., Akli, K., Clarke, R., Delettrez, J.A., Freeman, R.R., Glenzer, S., Green, J., Gregori, G., Heathcote, R., Izumi, N., King, J.A., Koch, J.A., Kuba, J., Lancaster, K., MacKinnon, A.J., Key, M., Mileham, C., Myatt, J., Neely, D., Norreys, P.A., Park, H.-S., Pasley, J., Patel, P., Regan, S.P., Sawada, H., Shepherd, R., Snavely, R., Stephens, R.B., Stoeckl, C., Storm, M., Zhang, B., and Sangster, T.C.. Hot Surface Ionic Line Emission and Cold K-Inner Shell Emission from Petawatt-Laser-Irradiated Cu Foil Targets. United States: N. p., 2006. Web. doi:10.1063/1.2188912.
Theobald, W., Akli, K., Clarke, R., Delettrez, J.A., Freeman, R.R., Glenzer, S., Green, J., Gregori, G., Heathcote, R., Izumi, N., King, J.A., Koch, J.A., Kuba, J., Lancaster, K., MacKinnon, A.J., Key, M., Mileham, C., Myatt, J., Neely, D., Norreys, P.A., Park, H.-S., Pasley, J., Patel, P., Regan, S.P., Sawada, H., Shepherd, R., Snavely, R., Stephens, R.B., Stoeckl, C., Storm, M., Zhang, B., & Sangster, T.C.. Hot Surface Ionic Line Emission and Cold K-Inner Shell Emission from Petawatt-Laser-Irradiated Cu Foil Targets. United States. doi:10.1063/1.2188912.
Theobald, W., Akli, K., Clarke, R., Delettrez, J.A., Freeman, R.R., Glenzer, S., Green, J., Gregori, G., Heathcote, R., Izumi, N., King, J.A., Koch, J.A., Kuba, J., Lancaster, K., MacKinnon, A.J., Key, M., Mileham, C., Myatt, J., Neely, D., Norreys, P.A., Park, H.-S., Pasley, J., Patel, P., Regan, S.P., Sawada, H., Shepherd, R., Snavely, R., Stephens, R.B., Stoeckl, C., Storm, M., Zhang, B., and Sangster, T.C.. Thu . "Hot Surface Ionic Line Emission and Cold K-Inner Shell Emission from Petawatt-Laser-Irradiated Cu Foil Targets". United States. doi:10.1063/1.2188912.
@article{osti_881716,
title = {Hot Surface Ionic Line Emission and Cold K-Inner Shell Emission from Petawatt-Laser-Irradiated Cu Foil Targets},
author = {Theobald, W. and Akli, K. and Clarke, R. and Delettrez, J.A. and Freeman, R.R. and Glenzer, S. and Green, J. and Gregori, G. and Heathcote, R. and Izumi, N. and King, J.A. and Koch, J.A. and Kuba, J. and Lancaster, K. and MacKinnon, A.J. and Key, M. and Mileham, C. and Myatt, J. and Neely, D. and Norreys, P.A. and Park, H.-S. and Pasley, J. and Patel, P. and Regan, S.P. and Sawada, H. and Shepherd, R. and Snavely, R. and Stephens, R.B. and Stoeckl, C. and Storm, M. and Zhang, B. and Sangster, T.C.},
abstractNote = {A hot, 2 to 3 keV electron temperature surface plasma was observed in the interaction of a 0.7 ps petawatt laser beam with solid copper-foil targets at intensities >10^20 W/cm^2. Copper K-shell spectra were measured in the range of 8 to 9 keV using a single-photon-counting x-ray charged-coupled-device camera. In addition to K-sub alpha and K-sub beta inner shell lines, the emission contained the Cu He-sub alpha and Ly-sub alpha lines, allowing the temperature to be inferred. Measurements of the absolute K-sub alpha yield as a function of the laser intensity are in general agreement with a model that inlcudes refluxing and confinement of the suprathermal electrons in the target volume.},
doi = {10.1063/1.2188912},
journal = {Physics of Plasmas},
number = ,
volume = 13,
place = {United States},
year = {Thu Apr 27 00:00:00 EDT 2006},
month = {Thu Apr 27 00:00:00 EDT 2006}
}
  • A hot, T{sub e} {approx} 2- to 3-keV surface plasma was observed in the interaction of a 0.7-ps petawatt laser beam with solid copper-foil targets at intensities >10{sup 20} W/cm{sup 2}. Copper K-shell spectra were measured in the range of 8 to 9 keV using a single-photon-counting x-ray CCD camera. In addition to K{sub {alpha}} and K{sub {beta}} inner-shell lines, the emission contained the Cu He{sub {alpha}} and Ly{sub {alpha}} lines, allowing the temperature to be inferred. These lines have not been observed previously with ultrafast laser pulses. For intensities less than 3 x 10{sup 18} W/cm{sup 2}, only themore » K{sub {alpha}} and K{sub {beta}} inner-shell emissions are detected. Measurements of the absolute K{sub {alpha}} yield as a function of the laser intensity are in agreement with a model that includes refluxing and confinement of the suprathermal electrons in the target volume.« less
  • A hot, 2 to 3 keV electron temperature surface plasma was observed in the interaction of a 0.7 ps petawatt laser beam with solid copper-foil targets at intensities >10{sup 20} W/cm{sup 2}. Copper K-shell spectra were measured in the range of 8 to 9 keV using a single-photon-counting x-ray charged-coupled-device camera. In addition to K{sub {alpha}} and K{sub {beta}} inner-shell lines, the emission contained the Cu He{sub {alpha}} and Ly{sub {alpha}} lines, allowing the temperature to be inferred. These lines have not been observed previously with ultrafast laser pulses. For intensities less than 3x10{sup 18} W/cm{sup 2}, only the K{submore » {alpha}} and K{sub {beta}} inner-shell emissions are detected. Measurements of the absolute K{sub {alpha}} yield as a function of the laser intensity are in general agreement with a model that includes refluxing and confinement of the suprathermal electrons in the target volume.« less
  • Measurements of plasma temperature at the rear surface of foil targets due to heating by hot electrons, which were produced in short pulse high intensity laser matter interactions using the 150 J, 0.5 ps Titan laser, are reported. Extreme ultraviolet (XUV) imaging at 256 and 68 eV energies is used to determine spatially resolved target rear surface temperature patterns by comparing absolute intensities to radiation hydrodynamic modeling. XUV mirrors at these two energies were absolutely calibrated at the Advanced Light Source at the Lawrence Berkeley Laboratory. Temperatures deduced from both imagers are validated against each other within the range ofmore » 75-225 eV.« less
  • The influences of lateral target size on hot electron production and electromagnetic pulse emission from laser interaction with metallic targets have been investigated. Particle-in-cell simulations at high laser intensities show that the yield of hot electrons tends to increase with lateral target size, because the larger surface area reduces the electrostatic field on the target, owing to its expansion along the target surface. At lower laser intensities and longer time scales, experimental data characterizing electromagnetic pulse emission as a function of lateral target size also show target-size effects. Charge separation and a larger target tending to have a lower targetmore » potential have both been observed. The increase in radiation strength and downshift in radiation frequency with increasing lateral target size can be interpreted using a simple model of the electrical capacity of the target.« less
  • Target-heating effects on the K{sub {alpha}{sub 1{sub ,{sub 2}}}}-emission spectrum from small-mass Cu targets irradiated with 1-ps pulses focused to intensities >10{sup 18} W/cm{sup 2} have been observed. A collisional-radiative atomic physics model is unable to reproduce the time-integrated K{sub {alpha}{sub 1{sub ,{sub 2}}}}-emission spectrum from the smallest-mass targets when calculated with a single, time-independent thermal-electron temperature. When time-dependent heating to several hundred electron volts is included in the model, the synthetic spectra better reproduce the main observed spectral features.