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Physics of Plasmas
Electrons neutralizing an ion beam are additionally supplied to a magnetically expanding double layer ͑DL͒ plasma from the downstream side of the DL. The rf power and the argon gas pressure are maintained at 200 W and 55 mPa, respectively, and the source magnetic field is varied in the range of about 70-550 G. It is observed that the ion beam energy corresponding to the DL potential drop increases up to 30 eV with an increase in the magnetic field when supplying the additional electrons, whiledoi:10.1063/1.3499691 fatcat:go2bgtam35bxpfqvk4ifdl7bnu