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Flow Shear Effects on Plasma Microinstability in Open-Ended Magnetic Configurations

T. Kaneko, R. Hatakeyama

Fusion Science and Technology / Volume 47 / Number 1T / January 2005 / Pages 128-133

Technical Paper / Open Magnetic Systems for Plasma Confinement /

The external and independent control of parallel and perpendicular flow shears in collisionless magnetized plasmas is realized using segmented plasma sources. Then, ion flow velocity shears parallel to the magnetic-field lines are observed to destabilize not only the drift-wave but also the ion-cyclotron instabilities depending on the sign of the parallel shear in the absence of field-aligned electron drift flow in laboratory experiments. On the other hand, perpendicular ion flow velocity shears are demonstrated to suppress both the drift-wave and the ion-cyclotron instabilities, and furthermore, the suppressions are found to take place independently of the sign of the perpendicular shear.

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