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1988[X]
1Author    C. J. Timmermans, G.M W Kroesen, P. M. Vallinga, D. C. SchramRequires cookie*
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 Abstract    ig h D e n s ity , S u p e r-A tm o s p h e ric 2 k A C a s c a d e A rc in A rg o n Experimental results are reported for simultaneous pressure and current pulses up to 14 bar and 2200 A superimposed on an atmospheric pressure 60 A dc cascade arc. A current density over 108 A/m2, previously 107A/m2 (power density 1012W/m3, previously 1010W/m3) has been ob­ tained. The electron temperature of the thermal plasma was deduced from the end-on measured radiance of argon lines, and the electron density from the absolute continuum emission. The values found for the quantities mentioned during the quasi-stationary phase of the current pulse, lasting ~ 1 ms, were 27 000 K and 3 • 1023 m"3, respectively, at a pressure of ~ 1.5 bar (ionization degree 100%), and 18 000 K and > 1024m-3, respectively, for a pressure of 14 bar (ionization degree 60%). These values satisfy the LTE relation. Deviations from the Spitzer conductivity have been observed in this weakly non-ideal plasma. In general, the high ionized thermal plasma studied with its composition of neutral, singly ionized and doubly ionized argon atoms can serve as a useful medium for spectroscopic studies of highly ionized systems and as a valuable source of radiation in the visible a well as in the near and far ultraviolet parts of the spectrum. P la s m a P a r a m e te r s a n d W e a k ly N o n -I d e a l B e h a v io u r 
  Reference    Z. Naturforsch. 43a, 806—818 (1988); received April 301988 
  Published    1988 
  Keywords    High density, cascade arc, weakly non-ideal, super-atmospheric, argon 
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 TEI-XML for    default:Reihe_A/43/ZNA-1988-43a-0806.pdf 
 Identifier    ZNA-1988-43a-0806 
 Volume    43