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- W93558681 abstract "Measurements are presented of plasma properties near a hollow cathode made using a rapidly actuating Langmuir probe. The probe's x-y positioning system is designed to allow characterization of the intense plasma region commonly present within a few millimeters of a hollow cathode orifice. Of major concern for the Langmuir probe is the probe surface temperature, which should remain below ~1500 K during use to avoid electron emission and possible corruption of the current/voltage characteristics it is intended to measure. To avoid excessive temperatures, the probe is afforded minimum time in intense plasma regions via use of a motion system traveling at an average speed of ~1 m/s. The system is used to execute a complete Langmuir trace every 0.5 mm over ~6 cm of travel. A combined electrostatic analyzer (ESA) and Wein Filter (ExB) probe is also described. The ESA/ExB system is used to remotely measure the energy and charge state of ions produced within a prototype NSTAR discharge chamber. The ESA portion of the probe is employed to measure the ion distribution as a function of energy per charge state (E/z). The ExB probe section is then used to measure the charge state (z) of the ions with the ESA portion set to an E/z of interest. Detailed measurements are reported along various lines-of-sight where the remotely located probe is aimed (relative to the axis of the discharge chamber). Plans are described where future correlations between direct and remote measurements will be performed." @default.
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- W93558681 date "2005-01-01" @default.
- W93558681 modified "2023-09-23" @default.
- W93558681 title "Direct and Remote Measurements of Plasma Properties nearby Hollow Cathodes" @default.
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