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Proceedings Paper

Comparison between experiment and computer modeling for simple MILO configurations
Author(s): D. E.T.F. Ashby; J. Allen; J. W. Eastwood; K. C. Hawkins; L. M. Lea
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Paper Abstract

A detailed comparison of experimental results and computer simulation have been made for a number of simple axisymmetric MILO structures designed to operate at 1 GHz. The structures were built from a set of demountable components which enabled the number of cavities and their dimensions to be rapidly altered. Measurements were made of the fluctuating magnetic fields at the end of each cavity and of the applied voltage and current pulse. The amplitude and depth of RF modulation of the magnetic fields, although repeatable, changed drastically from one configuration to the next. These parameters were compared with predictions from VIPER, a 2D electromagnetic PIC code. Good quantitative agreement was obtained between experiment and simulation in most situations, however, late in the current pulse, after about 100 ns the level of RF began to decay; a phenomenon which became more pronounced as the applied voltage was increased. The effect was attributed to plasma formation on the cavity vanes and subsequent electron emission; this explanation was verified by computer modeling electron emission and by using vanes made from polished stainless steel in place of aluminum vanes.

Paper Details

Date Published: 1 May 1994
PDF: 4 pages
Proc. SPIE 2259, XVI International Symposium on Discharges and Electrical Insulation in Vacuum, (1 May 1994); doi: 10.1117/12.174575
Show Author Affiliations
D. E.T.F. Ashby, AEA Technology (United Kingdom)
J. Allen, AEA Technology (United Kingdom)
J. W. Eastwood, AEA Technology (United Kingdom)
K. C. Hawkins, AEA Technology (United Kingdom)
L. M. Lea, AEA Technology (United Kingdom)

Published in SPIE Proceedings Vol. 2259:
XVI International Symposium on Discharges and Electrical Insulation in Vacuum
Gennady A. Mesyats, Editor(s)

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