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Spatially resolved measurements of a supersonic Ar + ion beam are obtained using a movable retarding field energy analyzer positioned on the low potential side of a current-free helicon double-layer (DL). The DL is generated near the open end of the helicon source where the fairly "collisionless" argon plasma is expanding in a diverging magnetic field for a radio frequency power of 250 W and a pressure of about 0.35 mtorr. The potential drop of the DL induces ion acceleration and the formationdoi:10.1109/tps.2005.844958 fatcat:4cmcqddpvvhajiscanfhdgili4