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

Published online by Cambridge University Press:  09 March 2009

M. Chvojka ,
B. Králiková ,
E. Krouský ,
L. Láska ,
K. Maŝek ,
O. Renner ,
K. Rohlena ,
J. Skála ,
O. Ŝtirand  and
P. Trenda
M. Chvojka
Affiliation:
Institute of Physics of Czechoslovak Academy of Science, Prague 8, Na Slovance 2, 180 40 Czechoslovakia.
B. Králiková
Affiliation:
Institute of Physics of Czechoslovak Academy of Science, Prague 8, Na Slovance 2, 180 40 Czechoslovakia.
E. Krouský
Affiliation:
Institute of Physics of Czechoslovak Academy of Science, Prague 8, Na Slovance 2, 180 40 Czechoslovakia.
L. Láska
Affiliation:
Institute of Physics of Czechoslovak Academy of Science, Prague 8, Na Slovance 2, 180 40 Czechoslovakia.
K. Maŝek
Affiliation:
Institute of Physics of Czechoslovak Academy of Science, Prague 8, Na Slovance 2, 180 40 Czechoslovakia.
O. Renner
Affiliation:
Institute of Physics of Czechoslovak Academy of Science, Prague 8, Na Slovance 2, 180 40 Czechoslovakia.
K. Rohlena
Affiliation:
Institute of Physics of Czechoslovak Academy of Science, Prague 8, Na Slovance 2, 180 40 Czechoslovakia.
J. Skála
Affiliation:
Institute of Physics of Czechoslovak Academy of Science, Prague 8, Na Slovance 2, 180 40 Czechoslovakia.
O. Ŝtirand
Affiliation:
Institute of Physics of Czechoslovak Academy of Science, Prague 8, Na Slovance 2, 180 40 Czechoslovakia.
P. Trenda
Affiliation:
Institute of Physics of Czechoslovak Academy of Science, Prague 8, Na Slovance 2, 180 40 Czechoslovakia.
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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.

Type
Research Article
Information
Laser and Particle Beams , Volume 10 , Issue 4 , December 1992 , pp. 743 - 751
Copyright
Copyright © Cambridge University Press 1992

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