SUB-KEV X-RAY EMISSION FROM LASER PRODUCED PLASMAS
The radiation emitted by laser irradiated planar targets was measured in the energetically important soft x-ray spectral range 50 eV <or= hv <or= 1000 eV using a transmission grating spectrometer with x-ray film, bolometer or x-ray streak camera as detector. The target was irradiated by a frequency doubled Nd laser (lambda = 0.53 mum, 10 J/3 ns) or by an iodine laser (lambda = 1.3 mum, 100 J/300 ps). Absolutely measured spectra from targets of different material with atomic numbers in the range 4 to 82 are presented. The conversion efficiency of laser into x-ray energy increases with the atomic number from 2 % for Be to 40 % for Au (at lambda = 0.53 mum and 3 . 10**13 W/cm**2 laser intensity). In particular, the gold spectrum was measured for a wide range of intensities (3 . 10**11 to 5 . 10**15 W/cm**2). For discussion of the results a non LTE atomic physics model was developed, which calculates the emission from laser plasmas by taking into account the energy transport in the plasma by electrons and by radiation. The calculations are compared with the experiment.
Bibliographic Reference: 3RD INTERNATIONAL CONFERENCE ON THE RADIATIVE PROPERTIES OF HOT DENSE MATTER, WILLIAMSBURG, VIRGINIA (USA), OCT. 14-18, 1985 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32850 ORA
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Record Number: 1989125046300 / Last updated on: 1987-07-01
Available languages: en