摘要: Formation of strong double layers was observed experimentally in a magnetized plasma column maintained by a plasma source. The magnetic field is axially homogeneous except in a region at the anode where the electric current flows ... 展开 Formation of strong double layers was observed experimentally in a magnetized plasma column maintained by a plasma source. The magnetic field is axially homogeneous except in a region at the anode where the electric current flows into a magnetic mirror. The double layer has a stationary position only in the region of nonuniform magnetic field or at the aperture separating the source and the plasma column. It is characterized by a negative differential resistance in the current-voltage characteristic of the device. The parameter space, where the double layer exists, and the corresponding potential profiles and fluctuation spectra were studied. The electric current and the axial electric field are oppositely directed between the plasma source and a potential minimum formed in the region of inhomogeneous magnetic field. Electron reflection by the resulting potential barrier is an important current limitation mechanism. 收起