Abstract
The power required to heat a lanthanum hexiboride cathode for use in scanning electron microscopes (SEM) has been calculated and found to be in close agreement with experimental measurements. The analysis indicates that direct heating of the LaB6 by the heater current, and efficient heat transfer to the cathode from the heated supports, results in low power consumption. The operating temperature of the cathode support material must be carefully designed to avoid poisoning of the LaB6 by excessive metal evaporation and deposition on the cathode. The LaB6 cathode developed here is well suited to the small heater power supply of the SEM and improves the picture quality over the traditional tungsten filament cathodes.
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