To simultaneously improve the spatial and temporal performances of streak tubes, we have developed bilamellar x-ray streak tubes with the help of Philips Components (now Philips Photonics). We describe the structure of one of them, the P850X, and the prototype of the camera which uses it, the C850X. We used 80 fs pulse dye lasers developed at LOA (ENSTA) to characterize this instrument in UV and x-ray range. The results show that its time resolution is less than 2 ps even with 1.5 keV energy photons and its spatial resolution much better than 16 lp/mm. This instrument was used for studying the time evolution of x-ray emission from 80 fs and 1 ps laser created plasmas at very high intensities.
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