Analysis and Simulation of Anode Heating Due to Electron Field Emission
Date of this Version6-1-2003
This work was supported in part by an NSF Career Award (CTS-9983961), DARPA/APO (DAAD190110639) and a Vanderbilt University Discovery Grant.
This document has been peer-reviewed.
This paper considers the effect of anode heating from energetic electrons produced by field emission. Large electric fields accelerate emitted electrons as they traverse the vacuum gap toward the anode. Electron energy is transferred to the anode by collisions with the lattice. The nonequilibrium transfer of electron kinetic energy to anode thermal energy is examined quantitatively. Results demonstrate that the energy distribution of impinging electrons affects the transmission and dissipation of thermal energy. A Monte Carlo technique is used to resolve the thermalization of electrons and accounts for electron beam strength and spatial distribution. The results indicate that local heat fluxes of the order 10 occur at the anode surface and that heating is a strong function of field strength because of the exponential relationship between applied voltage and current. Under practical conditions, temperature increases of 10 degrees C are predicted from a single point emission source.
Anode heating, electron field emission, Monte Carlo