Evidence for ultra-fast heating in intense-laser irradiated reduced-mass targets

We report on an experiment irradiating individual argon droplets of 20 μm diameter with laser pulses of several Joule energy at intensities of 1019 W/cm2. K-shell emission spectroscopy was employed to determine the hot electron energy fraction and the time-integrated charge-state distribution. Spect...

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Bibliographic Details
Published in:Physics of plasmas 2012-12, Vol.19 (12)
Main Authors: Neumayer, P., Aurand, B., Costa Fraga, R. A., Ecker, B., Grisenti, R. E., Gumberidze, A., Hochhaus, D. C., Kalinin, A., Kaluza, M. C., Kühl, T., Polz, J., Reuschl, R., Stöhlker, T., Winters, D., Winters, N., Yin, Z.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ARGON
CHARGE STATES
COMPUTERIZED SIMULATION
Droplets
ELECTRON TEMPERATURE
ELECTRONS
EMISSION SPECTROSCOPY
EV RANGE
Heating
K SHELL
LASER RADIATION
Lasers
Modelling
Plasmas
RELAXATION
Spectra
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Summary:We report on an experiment irradiating individual argon droplets of 20 μm diameter with laser pulses of several Joule energy at intensities of 1019 W/cm2. K-shell emission spectroscopy was employed to determine the hot electron energy fraction and the time-integrated charge-state distribution. Spectral fitting indicates that bulk temperatures up to 160 eV are reached. Modelling of the hot-electron relaxation and generation of K-shell emission with collisional hot-electron stopping only is incompatible with the experimental results, and the data suggest an additional ultra-fast (sub-ps) heating contribution. For example, including resistive heating in the modelling yields a much better agreement with the observed final bulk temperature and qualitatively reproduces the observed charge state distribution.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4772773