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Time-resolved measurement of x-ray heating in plastic foils irradiated by intense soft-x-ray pulses.

Intense, soft-x-ray pulses, generated from separate laser-irradiated converters, were used to irradiate plane plastic foils. The x-ray heating was investigated by measuring the temperature histories of chlorinated tracer layers buried at different depths in the targets. The temperature diagonistic was a time-resolved extreme-UV absorption spectroscopy technique using chlorine {ital L}-shell transitions. The temporal temperature profiles were reasonably well reproduced by radiation-hydrocode simulations.