Spatially resolved energy analyzer measurements of an ion beam on the low potential side of a current-free double-layer

C. Charles
2005 IEEE Transactions on Plasma Science  
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 formation
more » ... f an ion beam which propagates downstream of the DL. An image showing the ion beam spatial properties 12 cm downstream of the DL is presented.
doi:10.1109/tps.2005.844958 fatcat:4cmcqddpvvhajiscanfhdgili4