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Laboratory Observation of a Plasma-Flow-State Transition from Diverging to Stretching a Magnetic Nozzle
Kazunori Takahashi1, Akira Ando1
1Department of Electrical Engineering, Tohoku University, Sendai 980-8579, Japan.
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.
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