X-ray preheating of window materials in direct-drive shock-wave timing experiments

The optical properties of x-ray preheated planar-window materials relevant for shock-wave timing experiments were studied on the OMEGA Laser System. The x-ray radiation was generated by 100 ps, 1 × 10 15 W ∕ cm 2 laser pulses incident on planar plastic targets, instantaneously affecting samples loca...

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Bibliographic Details
Published in:Physics of plasmas 2006-12, Vol.13 (12), p.122702-122702-11
Main Authors: Theobald, W., Miller, J. E., Boehly, T. R., Vianello, E., Meyerhofer, D. D., Sangster, T. C., Eggert, J., Celliers, P. M.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ABSORPTION
CHARGE CARRIERS
ICF DEVICES
INERTIAL CONFINEMENT
LASERS
LIGHT TRANSMISSION
PLASMA
PLASMA HEATING
POLYSTYRENE
PULSES
RADIATION TRANSPORT
REFRACTIVE INDEX
SHOCK WAVES
X RADIATION
X-RAY SOURCES
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Summary:The optical properties of x-ray preheated planar-window materials relevant for shock-wave timing experiments were studied on the OMEGA Laser System. The x-ray radiation was generated by 100 ps, 1 × 10 15 W ∕ cm 2 laser pulses incident on planar plastic targets, instantaneously affecting samples located ∼ 0.7 mm away. An abrupt onset of strong absorption of an optical probe beam ( λ = 532 nm ) and a temporally varying refractive index were measured in polystyrene and diamond windows. The behavior of diamond windows exposed to x rays is consistent with a simple model based on the generation of free charge carriers. Polystyrene windows showed indications of optical transitions due to molecular states that are created by the ionizing radiation.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.2397581