Interpretation and implementation of an ion sensitive probe as a plasma potential diagnostic
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Whyte_Interpretation and.pdf
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Author(s)
Ochoukov, Roman Igorevitch
Lipschultz, Bruce
Labombard, Brian
Wukitch, Stephen James
Whyte, Dennis G
Date Issued
October 2010
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
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.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1063/1.3483192
