Debye shielding measurements in a multipolar plasma with a Starkquenching of a metastable atomic hydrogen beam technique
Résumé
Electric fields play a key role in plasmas: they originate in a balance between what can be externally controlled and the collective behaviour of particles. The aim of this paper is to describe a new technique to measure electric fields. This diagnostic is based on the emission of the Lymanalpha radiation induced by the Stark quenching of 2s metastable level of hydrogen or hydrogenic species. The intensity of the radiation is proportional to the square of the electric field absolute value, which makes this technique very sensitive and allows to measure fields as low as 1 V/cm. We show measurements of a constant electric field generated in vacuum or in a plasma between two polarized plates.
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