TY - JOUR
T1 - Laboratory Observation of a Plasma-Flow-State Transition from Diverging to Stretching a Magnetic Nozzle
AU - Takahashi, Kazunori
AU - Ando, Akira
N1 - Funding Information:
This work is partially supported by grant-in-aid for scientific research (16H04084 and 26247096) from the Japan Society for the Promotion of Science, and the Yazaki Memorial Foundation for Science and Technology.
Publisher Copyright:
© 2017 American Physical Society.
PY - 2017/6/2
Y1 - 2017/6/2
N2 - 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.
AB - 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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U2 - 10.1103/PhysRevLett.118.225002
DO - 10.1103/PhysRevLett.118.225002
M3 - Article
C2 - 28621999
AN - SCOPUS:85020436254
VL - 118
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 22
M1 - 225002
ER -