CCD detectors are commonly used in various applications such as digital cameras, spectrographs, sky telescopes, etc. Special type, back-thinned silicon CCD camera detectors, without entrance window, are sensitive to electromagnetic radiation in a wide range of wavelengths from IR to x-rays below 1 nm. Their sensitivity is linear in a wide range of photons number, unlike classical detectors such as photographic films. If cooled, such a detector keeps a charge induced by radiation for a relatively long time. It makes possible to obtain images with low level of noise. A CCD detector was applied for pulsed x-ray radiography of gas jet targets. The radiography method, with the use of a laser-plasma x-ray source was developed at the Institute of Optoelectronics, Warsaw. This paper presents results of the investigation of gas jet targets created from xenon or argon performed with the use of a CCD camera (Reflex s.r.o.). To produce gas jet targets, a commercial electromagnetic valve (Parker Instr.) was used. The x-ray radiograms of the target were obtained using radiation at the wavelength of about 0.75 nm, produced in krypton plasmas and filtered by 20-μm thick Si and 10-μm thick Be filters. A single shadowgram was taken by multiple 1 Hz exposition of a CCD sensor during about 20 s. The parameters of gas jet targets were determined. Spatial distributions of the particle density at the nozzle axis and the particle density profiles perpendicularly to the axis for various backing pressures and time delays between x-ray pulse and opening valve are presented. The characterized gas jet targets will be used in the experiments on interaction of ultra-short, high-intensity laser pulses with gases.

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