NIFS-638

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Author(s):

K. Nagaoka, A. Okamoto, S. Yoshimura and M.Y. Tanaka

Title:

Plasma Flow Measurement Using Directional Langmuir Probe under Weakly Ion-Magnetized Conditions

Date of publication:

July 2000

Key words:

plasma flow, directional Langmuir probe, Mach probe, magnetic field effect, calibration method, E x B drift

Abstract:

It is both experimentally and theoretically demonstrated that ion flow velocity at an arbitrary angle with respect to the magnetic field can be measured with a directional Langmuir probe. Based on the symmetry argument, we show that the effect of magnetic field on directional probe current is exactly canceled in determining the ion flow velocity, and obtain the generalized relation between flow velocity and directional probe currents valid for any flowing direction. The absolute value of the flow velocity is determined by an textit{in situ} calibration method of the probe. The applicability limit of the present method to a strongly ion-magnetized plasma is experimentally examined.

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