Generation and control of field-aligned flow velocity shear in a fully ionized collisionless plasma was demonstrated. Collisionless plasma was produced when surface-ionized potassium ions and the thermionic electrons were generated by spatially separated ion and electron emitters. It was found that the ion flow energy could be varied with an accuracy of 0.1 V by applying the bias voltage to the ion emitter. This enabled precise generation and control of field-aligned ion flow velocity shear.
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