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Single microhollow cathode configuration combined with venturi gas flow system.
Breakdown voltages for various flow speeds from .
Pressure changes with various flow speed.
Photography of MHCD for the various value of the flow speed times hole diameter. Only the discharge in the condition of shows the entire hole filling that represents hollow cathode effect. In general, microhollow cathode discharge operates under the optimum condition. In this paper, since operating pressure in venturi system depends on the flow speed at region B, we considered the flow speed instead of the operating pressure for upper limit of hollow cathode effect.
The relative spectral band signals of the first negative system of and the second positive system (SPS) of for the and air discharge at under . These signals normalized by peak intensity. We compared the relative intensity ratio for the two types of discharge shape; ring and circle. The circle shape, which represents hollow cathode effect, shows higher ratio than that of ring shape. From the results, we could estimate that the hollow cathode effect forms the highly reduced electric field strength in the discharge.
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