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

Ochoukov, R.; Whyte, D. G.; Lipschultz, B.; LaBombard, B.; Wukitch, S.
October 2010
Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10E111
Academic Journal
An ion sensitive probe (ISP) is developed as a robust diagnostic for measuring plasma potentials ([uppercase_phi_synonym]P) in magnetized plasmas. The ISP relies on the large difference between the ion and electron gyroradii (ρi/ρe∼60) to reduce the electron collection at a collector recessed behind a separately biased wall distance ∼ρi. We develop a new ISP method to measure the plasma potential that is independent of the precise position and shape of the collector. [uppercase_phi_synonym]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 [uppercase_phi_synonym]P measured with an emissive probe over a wide range of plasma conditions in a small magnetized plasma.


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