Experimental Characterization of Anode Heating Due to Electron Field Emission
نویسندگان
چکیده
Recent advances in cold cathode field emitters have produced improvements in emission efficiency and thus enhanced the applicability of such devices. This article considers heating due to electron field emission from a polycrystalline diamond cathode. Temperature measurements from infrared thermography reveal highly localized heating due to nonuniform emission from the cathode. Power dissipation of 0.36 W produces a peak temperature increase of 12.5 K on the back surface of the water-cooled anode. Parameter estimation techniques are employed to predict the effective size of the heat source and the fraction of total power that is dissipated near hot spots. The estimates indicate effective heated radii of order 1 mm and power fractions in the range of 25% to 50%.
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