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X-ray Imaging of an Elongated Gas Puff Target to Be Used in X-ray Laser Experiments
| Content Provider | Semantic Scholar |
|---|---|
| Author | Bartnik, Andrzej Fiedorowicz, Henryk |
| Copyright Year | 2005 |
| Abstract | In this paper we present the results of characterization of an elongated double stream gas puff target with the use of X-ray backlighting method. The target will be used for creation of a plasma column as an active medium for an X-ray laser. Different kinds of elongated gas puff targets were used previously in numerous experiments connected with X-ray lasers (see for example [1,2]). Those were one stream targets formed by gas injection into vacuum through a narrow slit. Gas puff targets formed that way had not very high density and the density gradient. So, they were surrounded by large amount of relatively low density gas absorbing either part of a driving laser beam or X-ray radiation. To improve the conditions of plasma column creation an elongated double stream gas puff target was prepared. The target was produced by gas injection into a hollow stream of a buffer gas. The buffer gas should have a high ionization potential and a low absorption coefficient for X-ray laser radiation. In this work density distribution across the xenon and argon targets with helium as the buffer gas was measured with the use of an X-ray backlighting method. To perform the backlighting measurements a laser-plasma soft X-ray source utilizing krypton as a target was applied. The target was irradiated with laser pulses of energy 0.8 J and time duration of about 3 ns. The resulting power density at the laser spot after focusing was sufficient to obtain Ne-like ions of krypton. The ions emit radiation in the wavelength range around 0.75 nm and shorter. To select the radiation in relatively narrow band a 20 μm Si filter having the absorption edge at the wavelength λ=0.67 nm was used. The radiation was registered using a back-illuminated CCD camera. The elongated double stream gas puff targets were created between the X-ray source and the CCD detector. The radiation on its way to the detector was partially absorbed by inner gas forming the target (Xe or Ar) but not by the buffer gas (He). This way X-ray backlighting images were obtained. From intensity distribution of the images density profiles of the targets for different conditions were calculated. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.dxcicdd.com/05/PDF/Andrzej_Bartnik_xray.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
