Electric Probes in Stationary and Flowing Plasmas: Theory by Paul M. Chung, Lawrence Talbot, Kenell J. Touryan (auth.)

By Paul M. Chung, Lawrence Talbot, Kenell J. Touryan (auth.)

The electrical probe has lengthy been used as a basic diagnostic device for measuring the neighborhood homes of a plasma. due to the fact Langmuir first built the electric-probe method in 1924, probes were used to degree electron densities and temperatures in a wide selection of gaseous ionized media, reminiscent of electrical discharges, afterglows, ionizing surprise waves, flames, MHD, and plasma-jet flows, reentry motor vehicle movement fields, and atmospheric and area plasmas. the 1st systematic account of recent theories of electriC-probe habit was once given through Chen (1965), who additionally supplied sensible info on experimental concepts. A next survey by way of fast and Schwar (1970), which used to be consultant of effects inside the literature via 1969, integrated additional info on a few of the sleek theories and on functional information of probe usage. the aim of this quantity is to complement the formerly pointed out works via delivering an account of a big physique of the up to date informa­ tion on hand on electrical probes, rather within the parts of transitional and continuum-flow phenomena, and by means of providing, for all domain names of probe appli­ cation, a serious appraisal of the extra major probe theories and experi­ psychological investigations within the literature.

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Sample text

1968) for spherical probes are shown in Fig. 2-5. As can be seen from this figure, the Lam analysis was found also to give accurate predictions in the range of its 1. validity, which is Xip-4/3 = 0(1), with Attempts have also been made to verify Laframboise's results for cylindrical probes in flowing plasmas, under the assumption that a cylindrical probe aligned with the flow direction will, if all relevant mean free paths are significantly greater than the probe radius, respond in the same fashion as a cylindrical probe in a stationary plasma.

Sanmartin (1972) has produced an analytical study that parallels the numerical study of Hester and Sonin, and also Sanmartin (1972) has been able to carry out a more accurate analytical study of the angle-of-attack problem treated in approximate fashion by Bettinger and Chen. Before discussing the results of these studies, particularly the results of Hester and Sonin, let us describe briefly in physical terms the nature of the end effect. It occurs for ~p 1, that is, when the sheath radius becomes significantly greater than the probe radius and under conditions when, in a quiescent plasma, the probe would be operating in the OML regime.

This plausibility argument would seem to be substantiated by the experiments of Dunn and Lordi (I 970) and by Graf and De Leeuw (I967). However, there is a situation for which the argument does not apply-when an "end effect" becomes important, and an additional parameter enters, the ratio IIAD of the probe length to the Debye 28 Electric Probes in Stationary and Flowing Plasmas length. This parameter may also be seen to arise from the introduction of the aspect ratio fiR, in the form of the product (fiR) (RIAn).

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