Heating based model analysis for explosive emission initiation at metal cathodes

Date
2015-12-31
Journal Title
Journal ISSN
Volume Title
Publisher
AIP Publishing
Abstract

This contribution presents a model analysis for the initiation of explosive emission; a phenomena that is observed at cathode surfaces under high current densities. Here, localized heating is quantitatively evaluated on ultrashort time scales as a potential mechanism that initiates explosive emission, based on a two-temperature, relaxation time model. Our calculations demonstrate a strong production of nonequilibrium phonons, ultimately leading to localized melting. Temperatures are predicted to reach the cathode melting point over nanosecond times within the first few monolayers of the protrusion. This result is in keeping with the temporal scales observed experimentally for the initiation of explosive emission.

Description
Keywords
Electrical engineering, Cathodes, Electric Fields, Semiconductors
Citation
Heating based model analysis for explosive emission initiation at metal cathodes Majzoobi, A. and Joshi, R. P. and Neuber, A. and Dickens, J., AIP Advances, 5, 127237 (2015), http://dx.doi.org/10.1063/1.4939569
Collections