TY - JOUR
T1 - Measurements of mode structure of shear-modified drift wave using Y- and Γ- shaped electrostatic probes
AU - Kaneko, T.
AU - Hatakeyama, R.
PY - 2010/9
Y1 - 2010/9
N2 - Mode structures of drift-wave instabilities modified by a field-aligned flow velocity shear are investigated, where axial and azimuthal wave numbers are measured using Y-shaped and Γ-shaped electrostatic probes, respectively. When the ion flow velocity shear is produced by applying different bias voltages to three segments of an ion source, drift waves having azimuthal mode number m = 1, 2, and 3 are observed to be excited simultaneously. It is found that the excitation-threshold value of the shear strength depends on the azimuthal mode number, as expected from a model based on a kinetic theory, suggesting that the observations are explained by the competition between inverse electron Landau damping and shear-modified ion Landau damping.
AB - Mode structures of drift-wave instabilities modified by a field-aligned flow velocity shear are investigated, where axial and azimuthal wave numbers are measured using Y-shaped and Γ-shaped electrostatic probes, respectively. When the ion flow velocity shear is produced by applying different bias voltages to three segments of an ion source, drift waves having azimuthal mode number m = 1, 2, and 3 are observed to be excited simultaneously. It is found that the excitation-threshold value of the shear strength depends on the azimuthal mode number, as expected from a model based on a kinetic theory, suggesting that the observations are explained by the competition between inverse electron Landau damping and shear-modified ion Landau damping.
KW - Drift wave
KW - Flow velocity shear
KW - Mode structure
KW - Y- and Γ-shaped probes
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U2 - 10.1002/ctpp.201010134
DO - 10.1002/ctpp.201010134
M3 - Article
AN - SCOPUS:77958517407
VL - 50
SP - 796
EP - 801
JO - Contributions to Plasma Physics
JF - Contributions to Plasma Physics
SN - 0863-1042
IS - 9
ER -