Title :
Velocity and temperature measurements of Z pinch plasmas using optical Thomson scattering
Author :
Harvey-Thompson, A.J. ; Lebedev, S.V. ; Patankar, S. ; Smith, R. ; Doyle, H. ; Bland, S.N. ; Chittenden, J.P. ; Hall, G.N. ; Suzuki-Vidal, F. ; Swadling, G. ; Burdiak, G. ; de Grouchy, P. ; Pickworth, L. ; Khoori, E. ; Suttle, L. ; Colaitis, A.
Author_Institution :
Imperial Coll., London, UK
Abstract :
Summary form only given. A Thomson scattering diagnostic has been developed to probe plasmas produced using the MAGPIE generator (1.4MA, 240ns). The diagnostic uses a frequency doubled Nd:YAG laser delivering ~3-4J in 8ns FWHM to the target plasma. The density and temperature of the wire array targets probed produces scattered light in the collective regime (α>;>;1). Any bulk motion of the probed plasma Doppler shifts the scattered spectrum allowing the velocity of the probed plasma to be measured. Measurements of the ablation velocity in cylindrical wire arrays at different positions in the arrays and for different wire materials as well as for jets produced by radial arrays are presented. In addition, the ion acoustic features in this scattering regime can be used to take measurements of electron and ion temperatures in e.g. precursor plasmas.
Keywords :
Doppler shift; Z pinch; laser ablation; plasma diagnostics; plasma ion acoustic waves; plasma jets; plasma light propagation; plasma temperature; FWHM; MAGPIE generator; Thomson scattering diagnostic; Z pinch plasmas; ablation velocity measurements; bulk motion; collective regime; current 1.4 MA; cylindrical wire arrays; electron temperature measurement; energy 3 J to 4 J; frequency doubled Nd:YAG laser; ion acoustic features; ion temperature measurement; jets; optical Thomson scattering; precursor plasmas; probed plasma Doppler; probed plasma velocity; radial arrays; scattered light; scattered spectrum; scattering regime; target plasma; time 240 ns; time 8 ns; wire array target density; wire array target temperature; wire materials; Frequency measurement; Generators; Scattering; Temperature measurement;
Conference_Titel :
Plasma Science (ICOPS), 2011 Abstracts IEEE International Conference on
Conference_Location :
Chicago, IL
Print_ISBN :
978-1-61284-330-8
Electronic_ISBN :
0730-9244
DOI :
10.1109/PLASMA.2011.5992955
