Ion rotational velocity of a field-reversed configuration plasma measured by neutral beam probe spectroscopy

Journal Article · Thu Jan 01 00:00:00 EST 1987 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.866165· OSTI ID:6701722

Ito, Y; Tanjyo, M; Ohi, S; Goto, S; Ishimura, T

The ion rotational angular velocity ..cap omega.. and the ion temperature T/sub i/ of a translated field-reversed configuration (FRC) plasma are measured using neutral beam probe spectroscopy. The value of ..cap omega.. is --(1.0--1.2) x ..cap omega..* at the onset time of the n = 2 rotational instability, where ..cap omega..* is the ion diamagnetic frequency for a rigid-rotor equilibrium. The ion rotational direction is the same as the ion diamagnetic direction. The value of ..cap omega.. is smaller than the angular frequency ..omega../sub re/ of the n = 2 instability, which can yield experimental evidence of the ion kinetic effects on the n = 2 instability in the FRC plasma. When the octupole field is applied to the plasma in order to suppress the n = 2 deformation, ..cap omega.. is slightly reduced. The ion temperature T/sub i/ is --70 eV at the onset time of the n = 2 instability.

• Research Organization: Plasma Physics Laboratory, Faculty of Engineering, Osaka University Suita, Osaka 565, Japan
• OSTI ID: 6701722
• Journal Information: Phys. Fluids; (United States), Vol. 30:1
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
PLASMA
ANGULAR VELOCITY
ION TEMPERATURE
PLASMA INSTABILITY
PLASMA DIAGNOSTICS
NEUTRAL ATOM BEAM INJECTION
MAGNETIC FIELD REVERSAL
PROBES
SPECTROSCOPY
BEAM INJECTION
INSTABILITY
MAGNETIC FIELD CONFIGURATIONS
VELOCITY
700107* - Fusion Energy- Plasma Research- Instabilities
700102 - Fusion Energy- Plasma Research- Diagnostics