Record Details

First application of a digital mirror Langmuir probe for real-time plasma diagnosis

Harvard Dataverse (Africa Rice Center, Bioversity International, CCAFS, CIAT, IFPRI, IRRI and WorldFish)

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Title First application of a digital mirror Langmuir probe for real-time plasma diagnosis
 
Identifier https://doi.org/10.7910/DVN/BRJE87
 
Creator McCarthy, W.; Golfinopoulos, T.; Woller, K.B.; Vincent, C.; Kuang, A.; Labombard, B.
 
Publisher Harvard Dataverse
 
Description For the first time, a digital Mirror Langmuir probe (MLP) has successfully sampled plasma temperature, ion saturation current, and floating potential together on a single probe tip in real time in a radio-frequency driven helicon linear plasma device. This is accomplished by feedback control of the bias sweep to ensure a good fit to I-V characteristics with a high frequency, high power digital amplifier and field-programmable gate array (FPGA) controller. Measurements taken by the MLP were validated by a low speed I-V characteristic manually collected during static plasma conditions. Plasma fluctuations, induced by varying the axial magnetic field (f̃ = 10 Hz), were also successfully monitored with the MLP. Further refinement of the digital MLP pushes it towards a turn-key system that minimizes the time to deployment and lessens the learning curve, positioning the digital MLP as a capable diagnostic for the study of low radio-frequency plasma physics. These demonstrations bolster confidence in fielding such digital MLP diagnostics in magnetic confinement experiments with high spatial and adequate temporal resolution such as edge plasma, scrape-off layer, and divertor probes.
 
Subject Physics
current-potential
floating potentials
ion saturation current
plasma diagnosis
plasma temperature
probe tips
real- time
single probe