Radiative heating of plastic-tamped aluminum foil by x rays from a foam-buffered hohlraum.
The time dependence of the x-ray absorption of aluminum samples heated with intense radiation sources from a foam-buffered gold hohlraum has been studied in this work. Hydrodynamic simulations were used to illustrate the plasma conditions in the plastic-tamped aluminum foils contained in this type of hohlraum. Experiments were conducted to measure the K -shell x-ray absorption spectra of the aluminum sample. With densities taken from the hydrodynamic simulations, electron temperatures were then inferred by fitting the measured absorption spectra with detailed-term-accounting calculations. The inferred temperatures have a maximum of about 93eV and were found to agree within 25% with the simulated results at times after 1ns , indicating that the use of foam shields, together with a compact cavity, has created a clean and high-temperature radiation source preferable to opacity measurements.
Zhang
Jiyan
J
Research Center of Laser Fusion, P. O. Box 919-986, Mianyang 621900, China.
Yang
Jiamin
J
Xu
Yan
Y
Yang
Guohong
G
Ding
Yaonan
Y
Yan
Jun
J
Yuan
Jianmin
J
Ding
Yongkun
Y
Zheng
Zhijian
Z
Zhao
Yang
Y
Hu
Zhimin
Z