Numerical estimation of hotspot temperatures in electrodes subjected to pulsed electron beam heating in vacuum

Balachandra, TC and Ravindran, K and Nagabhushana, GR (1991) Numerical estimation of hotspot temperatures in electrodes subjected to pulsed electron beam heating in vacuum. In: International Communications in Heat and Mass Transfer, 18 (3). pp. 397-405.

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Abstract

A numerical solution for the transient temperature distribution in a cylindrical disc heated on its top surface by a circular source is presented. A finite difference form of the governing equations is solved by the Alternating Direction Implicit (ADI) time marching scheme. This solution has direct applications in analyzing transient electron beam heating of target materials as encountered in the prebreakdown current enhancement and consequent breakdown in high voltage vacuum gaps stressed by alternating and pulsed voltages. The solution provides an estimate of the temperature for pulsed electron beam heating and the size of thermally activated microparticles originating from anode hot spots. The calculated results for a typical 45kV (a.c.) electron beam of radius 2.5 micron indicate that the temperature of such spots can reach melting point and could give rise to microparticles which could initiate breakdown.

Item Type:	Journal Article
Publication:	International Communications in Heat and Mass Transfer
Publisher:	Elsevier science
Additional Information:	Copyright of this article belongs to Elsevier science.
Department/Centre:	Division of Electrical Sciences > High Voltage Engineering (merged with EE) Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	26 Nov 2010 06:57
Last Modified:	26 Nov 2010 06:57
URI:	http://eprints.iisc.ac.in/id/eprint/34015

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