Double-Probe Method for Unstable Plasmas

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Abstract
In order to check the accuracy of electron temperature measurements by the Langmuir probe method in a plasma with large fluctuations in space potential, a method has been used which employs a floating probe in addition to the usual biased probe. The results show that the oscillations do not noticeably affect temperatures found by the standard method, so that it is not usually necessary to use this two‐probe time‐resolved method even in the presence of fairly large oscillations. Furthermore, the usefulness of this method in the case of an inhomogeneous plasma is illustrated.

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