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Experimental opacity data were used to evaluate the opacity models and their accuracy of the calculated results. In order to study the opacity of carbon material in the shell of the inertial confinement fusion ignition target, the experimental study of the spectral-resolved opacity of radiation heated carbon plasma was carried out on the Shenguang III prototype laser facility. Eight nanosecond lasers were injected into a conical-cylindrical gold hohlraum and converted to intense X-ray radiation，the high temperature plasma was obtained by radiatively heating the CH film in the center of the hohlraum. Temporal evolutions of temperature and density of carbon plasma were simulated with the Multi-1D code. By using a spatially resolved gated flat field grating spectrometer combined with the ninth beam smoothing surface backlight technology, the absorption spectra and backlighter spectra of CH sample were measured in one shot. Finally, the experimental transmission spectra of carbon plasma (with temperature of 65eV and density of 0.003g/cm3) in the 300eV-500eV region have been obtained and compared with the calculated results of a DCA/UTA opacity code.
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Keywords:
- Radiative opacity /
- Inertial confinement fusion /
- Absorption spectra
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