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Conductivity Measurements of Nonideal C Plasmas
Author(s) -
Haun J.,
Kunze H.J.
Publication year - 1999
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.2150390141
Subject(s) - plasma , materials science , electrical resistivity and conductivity , conductivity , electron temperature , homogeneity (statistics) , electron density , atomic physics , electron , plasma diagnostics , plasma parameters , physics , nuclear physics , statistics , mathematics , quantum mechanics
We report measurements of the conductivity of nonideal C‐plasmas. They are produced by evaporating a carbon‐wire placed in a capillary within some hundred nanoseconds. Homogeneity of the plasma is obtained by the use of a ‘pre‐heating‐system’ which heats the wire before the main discharge. This way the initial resistivity of the wire is decreased, the discharge time is shortened. The reproducibility of the plasma is enhanced, the growth of instabilities is reduced. The conductivity is measured during 1 ms of the discharge. The particle density is of the order of 10 22 cm −3 while the electron temperature is varying between 8000 K and 25000 K, the electron density is about 10 18 cm −3 . The temperature is measured spectroscopically by fitting a Planck curve to the spectrally resolved emission profile. The results are compared with theories from Spitzer, Ziman and the SESAME‐data.