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We measured several characteristics of the x-ray emission from plasmas produced at the focus of a high-power ({~}10 GW) laser. X-ray spectra in the 1-2-keV region show that the plasmas contain highly stripped atoms (10-12 electrons missing from Al, 20-22 from Zn, and 36-38 from Gd). The laser-plasma x-ray source can emit about 0.1 J of x rays above 1 keV in 1 nsec from a volume about 100 {μ}m in diameter. This corresponds to more than 10¹³ W/cm³.
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Nagel et al. (1974) studied this question.
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