Laboratory Observation of a Plasma-Flow-State Transition from Diverging to Stretching a Magnetic Nozzle

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22 Citations (Scopus)

Abstract

An axial magnetic field induced by a plasma flow in a divergent magnetic nozzle is measured when injecting the plasma flow from a radio frequency (rf) plasma source located upstream of the nozzle. The source is operated with a pulsed rf power of 5 kW, and the high density plasma flow is sustained only for the initial ∼100 μsec of the discharge. The measurement shows a decrease in the axial magnetic field near the source exit, whereas an increase in the field is detected at the downstream side of the magnetic nozzle. These results demonstrate a spatial transition of the plasma-flow state from diverging to stretching the magnetic nozzle, where the importance of both the Alfvén and ion Mach numbers is shown.

Original languageEnglish
Article number225002
JournalPhysical Review Letters
Volume118
Issue number22
DOIs
Publication statusPublished - 2017 Jun 2

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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