Abstract
The effect of magnetic field-aligned ion flow with a transverse flow velocity gradient (parallel velocity shear) on the excitation of the electrostatic ion cyclotron (EIC) instability in narrow current channels (width<ion gyroradius) is studied experimentally in a double-ended Q machine. The presence of parallel velocity shear may lead to the excitation of the EIC instability even in current filaments too small to otherwise support the instability.
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