L-band x-ray absorption of radiatively heated nickel.
Absorption of L-M and L-N transitions of nickel has been measured using point projection spectroscopy. The x-ray radiation from laser-irradiated gold cavities was used to heat volumetrically nickel foils "tamped with carbon" up to 20 eV. Experimental spectra have been analyzed with calculations based on the spin-orbit split arrays statistical approach and performed for each ionic species Ni5+ to Ni11+. Using a least-squares fit, this method provides an ion distribution broader than at local thermodynamic equilibrium, which is explained by spatial and temporal temperature gradients. A major improvement in the simulation of the absolute value of transmission is obtained with a resolved transition array statistical calculation that reproduces the experimental spectrum with the nominal areal mass density by taking into account the saturation of narrow lines.
Chenais-Popovics
C
C
Laboratoire pour l'Utilisation des Lasers Intenses, UMR 7605 CNRS, Ecole Polytechnique, 91128 Palaiseau Cedex, France.
Fajardo
M
M
Gilleron
F
F
Teubner
U
U
Gauthier
J-C
JC
Bauche-Arnoult
C
C
Bachelier
A
A
Bauche
J
J
Blenski
T
T
Thais
F
F
Perrot
F
F
Benuzzi
A
A
Turck-Chièze
S
S
Chièze
J-P
JP
Dorchies
F
F
Andiel
U
U
Foelsner
W
W
Eidmann
K
K