Optical Spectroscopy of Free‐Propagating Plasma and Its Interaction with Tungsten Targets in PF‐1000 Facility

The paper describes the application of optical spectroscopy methods for investigation of intense plasma streams, which are emitted from the large PF-1000 facility operated at 21-27 kV, 290-480 kJ, as well as for studies of interactions of such streams with tungsten (W) targets. The electron concentration, as estimated from the Stark broadening of the Dβ line recorded at a distance of z = 30 cm from the electrode ends, changed from about 2.2×1016 to 0.5×1016 cm–3 in about 5 µs. Spectroscopic measurements were also carried out in experiments performed with a pure W-target placed at z = 30 cm. There were for the first time in PF-1000 recorded and identified many WI and WII lines. In some cases an analysis of the Dβ line was impossible because of its very strong re-absorption. A quantitative analysis of the W-lines was not performed, but some information about dynamics of the W-ions production was obtained (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)