14 October 1997 High-resolution x-ray spectroscopy of multicharged argon and krypton ions using a laser-produced x-ray source with a gas-puff target
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A hot and dense plasma can be produced by high-power laser irradiation of a high-pressure gas puff target. The plasma emits strong x-ray radiation in low photon-energy range (soft x-rays and XUV radiation) and is considered to be used as a debrisless laser-produced x-ray source. It was shown that the laser-irradiated gas puff plasma is an ideal source for the high-resolution spectroscopic studies of complex spectra of the multicharged ions. This paper reports our investigations of x-ray spectra of heliumlike argon and neonlike krypton ions. The gas puff targets were created with the use of a specially designed high-pressure solenoid valve operating at a backing pressure up to 15 at and quipped with a sonic-type circular nozzle of 0.5 mm in diameter. Parameters of the gas puff targets were measured using x-ray shadowgraphy and laser interferometry. To irradiate the gas puff targets we have used a Nd:glass laser, which generates 10 J pulses in 1 ns FWHM. The laser beam was focused onto the gas puff target perpendicularly in respect to the flow of gas using an aspherical lens. The diameter of a laser beam in the focus were about 100 micrometers , what ensured the radiation power density to be of order of 1014 W/cm2. To measure x-ray spectra emitted by a laser-irradiated gas puff target we have used a simple focusing crystal spectrographs with a mica crystal curved into a spherical surface of radius R equals 100 mm. The spectra were recorded on Kodak RAR 2495 x-ray commercial film. The high resolving power of the spectrograph of about (lambda) /(Delta) (lambda) equals 10000 permitted high-precision wavelength spectral measurements. The measured x-ray spectra have the small spectra width of the observed lines associated with the low expansion velocity of the laser- irradiated gas puff plasma. Dielectronic sodiumlike satellites to neonlike krypton resonance lines have measured for the first time. High-resolution spectra of heliumlike argon were also obtained. The measured spectra have been used for diagnosing the plasma parameters.
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Andrzej Bartnik, Andrzej Bartnik, Vladimir M. Dyakin, Vladimir M. Dyakin, Anatoly Ya. Faenov, Anatoly Ya. Faenov, Henryk Fiedorowicz, Henryk Fiedorowicz, Roman Jarocki, Roman Jarocki, Joseph Nilsen, Joseph Nilsen, Albert L. Osterheld, Albert L. Osterheld, Igor Yu. Skobelev, Igor Yu. Skobelev, Miroslaw Szczurek, Miroslaw Szczurek, } "High-resolution x-ray spectroscopy of multicharged argon and krypton ions using a laser-produced x-ray source with a gas-puff target", Proc. SPIE 3157, Applications of X Rays Generated from Lasers and Other Bright Sources, (14 October 1997); doi: 10.1117/12.283995; https://doi.org/10.1117/12.283995

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