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Soft x-ray emission from postpulse expanding laser-produced plasmas

Rev. Sci. Instrum. 74, 5076 (2003); doi:10.1063/1.1623619

Issue Date: December 2003

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J. L. Weaver
Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375

U. Feldman
Artep, Inc., Columbia, Maryland 21045
Space Science Division, Naval Research Laboratory, Washington, DC 20375

A. N. Mostovych
Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375

J. F. Seely
Space Science Division, Naval Research Laboratory, Washington, DC 20375

D. Colombant
Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375

G. Holland
SFA, Inc., 1401 McCormick Drive, Landover, Maryland 20785
A diagnostic spectrometer has been developed at the Naval Research Laboratory to measure the time resolved absolute intensity of radiation emitted from targets irradiated by the Nike laser. The spectrometer consists of a dispersive transmission grating of 2500 lines/mm or 5000 lines/mm and a detection system consisting of an absolutely calibrated Si photodiode array and a charge coupled device camera. In this article, this spectrometer was used to study the spatial distribution of soft x-ray radiation from low Z elements (primarily carbon) that lasted tens of nanoseconds after the main laser illumination was over. We recorded soft x-ray emission as a function of the target material and target orientation with respect to the incoming laser beam and the spectrometer line of sight. While a number of spectral features have been identified in the data, the instrument's combined temporal and spatial resolution allowed observation of the plasma expansion from CH targets for up to ~25 ns after the cessation of the main laser pulse. The inferred plasma expansion velocities are slightly higher than those previously reported. ©2003 American Institute of Physics.
History: Received 21 April 2003; accepted 7 September 2003
Permalink: http://link.aip.org/link/?RSINAK/74/5076/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.38.Ph
    X-ray, gamma-ray, and particle generation by lasers in plasmas
  • 52.70.La
    X-ray and gamma-ray plasma diagnostic measurements
  • 07.85.Nc
    X-ray and gamma-ray spectrometers
  • 52.50.Jm
    Plasma production and heating by laser beams including laser–foil, laser–cluster, etc
  • 52.25.Os
    Emission, absorption, and scattering of electromagnetic radiation from plasmas
  • YEAR: 2003

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PUBLICATION DATA

ISSN:
0034-6748 (print)   1089-7623 (online)
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