Abstract
Two different types of turbulence are observed in the presence of a large potential jump within a current-carrying plasma (vd<vte) and are investigated by means of correlation measurements. The electron beam on the high-potential side induced by the potential jump leads to the high-frequency turbulence ( f=fpe). The unstable waves follow the dispersion relation ω=kvb (vb is the electron beam velocity). The low-frequency turbulence ( f<fpi) observed on the low-potential side could be identified as the ion-acoustic turbulence and is dominated by low-frequency ( f<0.5 fpi ) waves propagating perpendicular to the electron drift.
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