Abstract
In order to fully understand the processes described in the preceding chapter one must have very detailed information on the temporal and spatial variations of the parameters of the discharge plasma. The times characterizing the development of the processes involved in pinch are on the order of 10-8 to 10-7 sec. To perform measurements with a commensurate resolution poses a very complex experimental problem. In addition to the experimental problems there are fundamental difficulties associated with the impracticality of many of the methods based on the presumed existence of thermodynamic equilibrium. The occurrence of strong deviations from thermodynamic equilibrium in a pinch-discharge plasma is already indicated by the mere observation of induced emission. The use of any method in this case requires special substantiation. This requirement is especially true of spectral techniques for determining the electron temperature. Spectral methods, however, permit a reliable determination of other parameters of the plasma (the ion temperature and ion and electron densities) without imposing stringent demands for the presence of thermodynamic equilibrium. An exceedingly important aspect of spectral methods is that they do not introduce perturbations into the investigated medium. Measurements of the electron temperature according to the plasma conductivity are the most reliable at high degrees of ionization. We now discuss the applicability of various plasma diagnostic methods under our experimental conditions.
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Skobel’tsyn, A.D.V. (1973). Determination of the Parameters of the Pinch-Discharge Plasma. In: Skobel’tsyn, A.D.V. (eds) Physical Processes in Lasers. The Lebedev Physics Institute Series, vol 56. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-1602-2_9
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DOI: https://doi.org/10.1007/978-1-4684-1602-2_9
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