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Type of Document	Dissertation
Author	Bond, Robert H.
URN	etd-09262002-144942
Persistent URL	http://resolver.caltech.edu/CaltechETD:etd-09262002-144942
Title	Directed electron velocity distributions in rare gas discharges using guard ring probes
Degree	PhD
Option	Electrical Engineering
Advisory Committee	Advisor Name Title unknown Committee Member
Keywords	none
Date of Defense	1965-05-14
Availability	unrestricted
Abstract NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. An experimental technique for determining detailed properties of anisotropic electron velocity distributions is described. For a planar Langmuir probe it is shown that [...] where [...] and [...] gives the density of electrons with velocities normal to the probe in the range[...]. This expression is valid for any distribution function making it possible to study anisotropies merely by changing the orientation of the probe. If the distribution function is isotropic the above expression is valid for cylindrical and small spherical probes as well. This technique is applied to the measurement of the directional properties of electron velocity distributions in the positive column of neon and helium hot cathode discharges. The necessary planar probe consists of a 0.01 inch diameter circular probe surrounded by a 0.090 inch square guard-ring. The measured distributions were Druyvesteyn in form except that all electrons were shifted in energy (in the direction of the external field) by an amount proportional to [...]. Here E is the magnitude of the external electric field and [...] the electron mean free path as a function of [...]. The experimental conditions are shown to be identical with those necessary in the derivation of the Druyvesteyn distribution.
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