NDLI: Space-charge-limited emission models for particle simulation

Content Provider	IEEE Xplore Digital Library
Author	Verboncoeur, J.P. Cartwright, K.L. Murphy, T.
Copyright Year	2004
Description	Author affiliation: Dept. of NE, California Univ., Berkeley, CA, USA (Verboncoeur, J.P.)
Abstract	Summary form only given. Space-charge-limited (SCL) emission of electrons from various materials is a common method of generating the high current beams required to drive high power microwave (HPM) sources. In the SCL emission process, sufficient space charge is extracted from a surface, often of complicated geometry, to drive the electric field normal to the surface close to zero. The emitted current is highly dominated by space charge effects as well as ambient fields near the surface. Simulation has become an important element in the design and analysis of HPM sources. In this work, we consider a number of computational models for the macroscopic SCL emission process. In particular, we consider models including application of Gauss's law and the Child-Langmuir law for space charge limited emission. The work includes consideration of enhancement of current near edges in SCL emitters. Models are described for ideal conductors, lossy conductors, and dielectrics. Also considered is the discretization of these models, and the implications for the emission physics. Previous work on primary and dual-cell emission models is re-examined, and aspects of the performance including fidelity and noise properties are improved. Models for one-dimensional diodes are considered, as well as multidimensional emitting surfaces which include corners and transverse fields. Both electrostatic and electromagnetic limits are considered.
Sponsorship	Plasma Sci. and Applications Committee of the IEEE Nuclear and Plasma Sci. Soc
File Size	86991
File Format	PDF
ISBN	0780383346
ISSN	07309244
DOI	10.1109/PLASMA.2004.1340044
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-07-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Space charge Computational modeling Conductors Dielectric losses Electron beams Electron emission High power microwave generation Microwave generation Power generation Microwave theory and techniques
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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