A MULTIPOLE EXPANSION FOR THE FIELD OF VACUUM CHAMBER EDDY CURRENTS

被引：11

作者：

LEE, SY ^{[1
]}

机构：

[1] BROOKHAVEN NATL LAB,UPTON,NY 11973

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 1991年 / 300卷 / 01期

关键词：

D O I：

10.1016/0168-9002(91)90718-6

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Analytical formulas for the multipole coefficients of a single current filament between two infinitely permeable iron plates are obtained. These are applied to the eddy currents generated in a two-dimensional conducting surface, such as a synchrotron vacuum chamber, when it is exposed to a rapidly varying magnetic field. We find that the sextupole component, b2, is insensitive to the chamber shape and depends only on the gap between the plates, if the width of the chamber is much larger than the height. Higher multipoles, b(n), decrease rapidly with increasing chamber width. The radius of convergence for the multipole expansion, at least up to n = 10, is about 80% of the width of the chamber.

引用

页码：151 / 158

页数：8