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Kilovolt radiation from a laser-produced Al plasma

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3 Author(s)
Cobble, J.A. ; Los Alamos National Laboratory, E526, Los Alamos, New Mexico 87545 ; Tierney, T.E. ; Abdallah, J.

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We have characterized kilo-electron-volt (keV) emission from Al plasmas for various laser illuminations at the OMEGA laser with the goal of optimizing the ability to backlight low-atomic-number materials such as beryllium for fusion ignition studies. The plasma is diagnosed by spectral-measurement comparisons to detailed theoretical atomic physics models. It is found that a significant fraction of the radiation is due to the x-ray continuum, that the electron temperature Te depends weakly on laser energy and power, and that the conversion efficiency to Lyman α (Lα, the N=2→1 transition in H-like Al) at 1.73 keV is reduced as laser energy is increased. As the number of beams is increased, the extra laser energy goes into a larger, higher-density plasma in which He-like and H-like ions are more effectively ionized.

Published in:

Journal of Applied Physics  (Volume:102 ,  Issue: 2 )

Date of Publication:

Jul 2007

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