Abstract
AbstractAn electron beam sheet injected into a plasma created regions of oppositely‐directed electric fields above and below the sheet. An emissive probe was used to measure the spatial structure of the plasma potential from which the electric field could be deduced. Laser‐induced fluorescence (LIF) was used to measure the spatial structure of the ion zonal flow velocity. The ExB velocity flow field predicted from the emissive probe results is compared to the LIF observations. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Highlights
Since at least the time of Langmuir [1, 3], probes have been used to study basic plasma parameters including currents of the various species in plasmas
A non-emissive Langmuir probe may provide a measure of the probe floating potential when the collected electron and ion currents balance, from which the plasma potential may be estimated
There are no emitted currents in the usual cold Langmuir probe operation excepting secondary electron emission
Summary
Since at least the time of Langmuir [1, 3], probes have been used to study basic plasma parameters including currents of the various species in plasmas. A non-emissive Langmuir probe may provide a measure of the probe floating potential when the collected electron and ion currents balance, from which the plasma potential may be estimated. Carroll, and Zintl have reported [14] on instabilities formed with the production of zonal flows created in Q-Machine experiments by dc potential applications to the plasma-creating ionization plates and additional annulus/grid arrangements They describe methods by which parallel (to B) and transverse velocity shear may be created. Their observations included the use of emissive probes for determining plasma potential (and inferring electric fields) and use of laser-induced fluorescence (LIF) for measuring ion distribution functions and flows. Comparison is made with the measured ion flow velocities and those predicted from the emissive probe measurements
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