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Schematic diagram of the experimental device.
IV traces of the cathode-diaphragm gap. Anode current (electron current) is (1a and 1b), (2a and 2b), (3a and 3b), and (4a and 4b). Gas pressure is . The floating potential is indicated by the arrow.
Axial behavior of the plasma potential. Curves shown are for case 2a of Fig. 2 with the diaphragm voltage at and case 2b of Fig. 2 with the diaphragm voltage at . Arrows indicate diaphragm potentials. The diaphragm is located from the cathode. The anode is not shown in the figure but is located from the cathode. Anode potentials are for case 2a and for case 2b. Gas pressure is .
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