Admittance Probe Method of Measuring Time Resolved Plasma Electron Temperatures

J. C. Sprott
Physics Department, University of Wisconsin, Madison, Wisconsin 53706
(Received 20 March 1968; and in final form, 7 June 1968)


It is shown that the plasma electron temperature in electron volts is given by the product of the ion saturation current and the probe-to-plasma resistance at the floating potential. An ac capacitance bridge circuit is described which will measure this resistance with a response time that approaches the ion transit time across the sheath. The method is demonstrated by a measurement of electron temperature in the Wisconsin toroidal octupole.

Ref: J. C. Sprott, Rev. Sci. Instrum. 39, 1569-1570 (1968)

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