Photoionized argon plasmas induced with intense soft x-ray and extreme ultraviolet pulses

0459913 - ÚFP 2017 RIV GB eng J - Journal Article
Bartnik, A. - Wachulak, P. - Fok, T. - Węgrzyński, L. - Fiedorowicz, H. - Skrzeczanowski, W. - Pisarczyk, T. - Chodukowski, T. - Kalinowska, Z. - Dudžák, Roman - Dostál, Jan - Krouský, Eduard - Skála, Jiří - Ullschmied, Jiří - Hřebíček, Jan - Medřík, Tomáš
Photoionized argon plasmas induced with intense soft x-ray and extreme ultraviolet pulses.
Plasma Physics and Controlled Fusion. Roč. 58, č. 1 (2016), č. článku 014009. ISSN 0741-3335. E-ISSN 1361-6587
R&D Projects: GA MŠMT LM2010014
EU Projects: European Commission(XE) 284464 - LASERLAB-EUROPE
Institutional support: RVO:61389021 ; RVO:68378271
Keywords : laser-plasma * plasma radiation * photoionization * Argon plasma * Nd:YAG laser * PALS iodine laser
OECD category: Fluids and plasma physics (including surface physics); Fluids and plasma physics (including surface physics) (FZU-D)
Impact factor: 2.392, year: 2016
http://iopscience.iop.org/article/10.1088/0741-3335/58/1/014009

n this work, photoionized plasmas were created by irradiation of gaseous argon with soft x-ray (SXR) and extreme ultraviolet (EUV) intense radiation pulses. Two different laser-produced plasma sources, employing a low energy Nd:YAG laser and a high energy iodine laser system (PALS), were used for creation of photoionized plasmas. In both cases the EUV or SXR beam irradiated the Ar stream, injected into a vacuum chamber synchronously with the radiation pulse. Emission spectra, measured for the Ar photoionized plasmas indicated strong differences in ionization degree for plasmas produced using low and high energy systems. In case of the the EUV driving pulses, emission lines corresponding to neutral atoms and singly charged ions were observed. In case of the SXR pulses utilized for the photoionized plasma creation, only Ar V-VIII emission lines were recorded. Additionally, electron density measurements were performed by laser interferometry employing a femtosecond laser system synchronized with the irradiating system. Maximum electron density for the Ar photoionized plasma, induced using the high energy system, reached 1.9 . 10(18) cm(-3). Interferometric measurements performed for the moment of maximum intensity of the main laser pulse (t = 0) revealed no fringe shift. Detection limit for the interferometric measurements was estimated. It allowed to estimate the upper limit for electron density at t = 0 as 5 . 10(16) cm(-3).
Permanent Link: http://hdl.handle.net/11104/0260069