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High temperature of field-emission cathode during its heating by the electric field
Posted Mar 15, 2018, 6:03 a.m. EDT Electromagnetic Heating, Low-Frequency Electromagnetics, Heat Transfer & Phase Change Version 5.2 0 Replies
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Hello, all!
I have the next problem in my simulation results in Comsol MultiPhysics (v. 5.2) which refers to the Joule heating of silicon field-emission cathode with a tip radius of 5 nm by the field-emission current density induced by an electric field at the surface (the maximum current density is about 10^6 A/cm^2, the amplitude of field is order of several V/nm). The point is that in a such condition the cathode temperature is increased up to 10^10-10^13 K, which is beyond the limits of acceptable values. The external temperature is assumed to be 300 K, the medium around the cathode is air. May be something wrong with the heat transfer at the nanoscale? What are the other suggestions for solving this problem?
Thank you for comments!
Hello Gleb Demin
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