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Interpretation and implementation of an ion sensitive probe as a plasma potential diagnostic

Author(s)
Ochoukov, Roman Igorevitch; Whyte, Dennis G.; Lipschultz, Bruce; Labombard, Brian; Wukitch, Stephen James
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Abstract
An ion sensitive probe (ISP) is developed as a robust diagnostic for measuring plasma potentials (Φ[subscript P]) in magnetized plasmas. The ISP relies on the large difference between the ion and electron gyroradii (ρ[subscript i]/ρ[subscript e] ∼ 60) to reduce the electron collection at a collector recessed behind a separately biased wall distance ∼ ρ[subscript i]. We develop a new ISP method to measure the plasma potential that is independent of the precise position and shape of the collector. Φ[subscript P] is found as the wall potential when charged current to the probe collector vanishes during the voltage sweep. The plasma potentials obtained from the ISP match Φ[subscript P] measured with an emissive probe over a wide range of plasma conditions in a small magnetized plasma.
Date issued
2010-10
URI
http://hdl.handle.net/1721.1/67491
Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering; Massachusetts Institute of Technology. Plasma Science and Fusion Center
Journal
Review of Scientific Instruments
Publisher
American Institute of Physics
Citation
Ochoukov, R. et al. “Interpretation and implementation of an ion sensitive probe as a plasma potential diagnostic.” Review of Scientific Instruments 81 (2010): 10E111. Web. 9 Dec. 2011. © 2010 American Institute of Physics
Version: Final published version
ISSN
0034-6748

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