Temperature determination using Kalpha spectra from M -shell Ti ions.
The compact multipulse terawatt (COMET) laser facility at LLNL was used to irradiate Al-coated 2-50 microm Ti foils with approximately 10(19) W cm(-2) , 500 fs, 3-6 J laser pulses. Laser-plasma interactions on the front side of the target generate hot electrons with sufficient energy to excite inner-shell electrons in Ti, creating Kalpha emission which has been measured using a focusing spectrometer with spatial resolution aimed at the back surface of the targets. The spatial extent of the emission varies with target thickness. The high spectral resolution (lambda/Deltalambda approximately equal to 3800) is sufficient to measure broadening of the Kalpha emission feature due to the emergence of blueshifted satellites from ionized Ti in a heated region of the target. A self-consistent-field model is used to spectroscopically diagnose thermal electron temperatures up to 40 eV in the strongly coupled Ti plasmas.
Hansen
S B
SB
Lawrence Livermore National Laboratory, P.O. Box 808, L-473, Livermore, California 94550, USA.
Faenov
A Ya
AY
Pikuz
T A
TA
Fournier
K B
KB
Shepherd
R
R
Chen
H
H
Widmann
K
K
Wilks
S C
SC
Ping
Y
Y
Chung
H K
HK
Niles
A
A
Hunter
J R
JR
Dyer
G
G
Ditmire
T
T