Determination of the electron density in the tokamak edge plasma from the time evolution of a laser-induced fluorescence signal from atomic helium |
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Authors: | A. V. Gorbunov D. A. Shuvaev I. V. Moskalenko |
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Affiliation: | 1. National Research Centre Kurchatov Institute, pl. Kurchatova 1, Moscow, 123182, Russia
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Abstract: | The time evolution of a laser-induced fluorescence signal from neutral helium He I in the edge and divertor plasmas in modern magnetic confinement devices is considered. Computations are performed on the basis of a nonstationary collisional-radiative model involving ten singlet and nine triplet states of helium that affect the time evolution of the fluorescence signal. A new method is proposed for determining the electron density from measurements of the time derivative of the profile of the fluorescence spectral line. |
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