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An effect of the target position relative to the laser focus on X-ray emission from the laser plasma

  • M. Chvojka (a1), B. Králiková (a1), E. Krouský (a1), L. Láska (a1), K. Maŝek (a1), O. Renner (a1), K. Rohlena (a1), J. Skála (a1), O. Ŝtirand (a1) and P. Trenda (a1)...

Abstract

The first harmonics beam generated by an iodine laser system was focused by an f/2 optics on an Al foil target. The X-ray output from the laser plasma both in the line and broad-band spectra was registered over an interval around the “ideal” focus. It was found that the maximum X-ray power is not obtained in the focus itself but for a somewhat larger focal spot outside the focus. To explain this phenomena, temperature and density measurements were in addition made. The plasma temperature evaluated from both the line (He-like Al XII resonant line and j, k, l satellites) and broad-band spectra (two foil method) was also measured and found to be largely constant in the vicinity of the focus. The line and broad-band temperatures differ, the broad-band temperature being about 25% higher. The electron density was equally determined using an intercombination line.

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References

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