The magnetic-field-induced transition from an expanding plasma to a double layer containing expanding plasma

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Abstract

The magnetic-field-induced transition from a simple expansion to a double layer is experimentally investigated in an argon low pressure radio frequency helicon source plasma. When the magnetic field is increased from 30 to 140 G in the plasma source, an abrupt increase in the plasma density and upstream potential is measured at 50 G. In the downstream plasma, the plasma density and potential show a small decrease with increasing magnetic field and no abrupt change. When the upstream jump is measured, simultaneous measurements in the downstream plasma show an ion beam characteristic of a double layer near the source exit. © 2007 American Institute of Physics.

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Charles, C., & Boswell, R. W. (2007). The magnetic-field-induced transition from an expanding plasma to a double layer containing expanding plasma. Applied Physics Letters, 91(20). https://doi.org/10.1063/1.2814877

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