Experimental studies on ion acceleration and stream line detachment in a diverging magnetic field
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580 (Japan)
- National Institute for Fusion Science, Toki, Gifu 509-5292 (Japan)
- Department of Electrical Engineering and Computer Science, Nagoya, Aichi 464-8603 (Japan)
The flow structure of ions in a diverging magnetic field has been experimentally studied in an electron cyclotron resonance plasma. The flow velocity field of ions has been measured with directional Langmuir probes calibrated with the laser induced fluorescence spectroscopy. For low ion-temperature plasmas, it is concluded that the ion acceleration due to the axial electric field is important compared with that of gas dynamic effect. It has also been found that the detachment of ion stream line from the magnetic field line takes place when the parameter |f{sub ci}L{sub B}/V{sub i}| becomes order unity, where f{sub ci}, L{sub B}, and V{sub i} are the ion cyclotron frequency, the characteristic scale length of magnetic field inhomogeneity, and the ion flow velocity, respectively. In the detachment region, a radial electric field is generated in the plasma and the ions move straight with the ExB rotation driven by the radial electric field.
- OSTI ID:
- 21389096
- Journal Information:
- Physics of Plasmas, Vol. 17, Issue 7; Other Information: DOI: 10.1063/1.3457139; (c) 2010 American Institute of Physics; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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