Nonlinearities in the response of beam position monitors for the LEP spectrometer

被引：2
|
作者：
Matheson, J [1 ]
机构：
[1] CERN, CH-1211 Geneva 23, Switzerland
来源：
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2001年 / 466卷 / 03期
关键词：
beam position monitor; beam energy measurement; relativistic beams;
D O I：
10.1016/S0168-9002(01)00256-X
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
The LEP Spectrometer determines the energy of the beam by measuring the bending angle due to a dipole magnet. using a total of six beam position monitors (BPM). The response to an off-centre beam of a BPM is not strictly linear with displacement and, in addition, depends on the size of the beam. The response also depends on the shape of the aperture of the BPM itself, since the inner surface is conducting and must therefore be an equipotential. For the LEP Spectrometer, BPM nonlinearities may become large enough to affect the beam energy measurement. We calculate the size of the effect for Gaussian beams within circular and elliptical apertures, drawing conclusions regarding the operation of the Spectrometer. (C) 2001 Elsevier Science B.V, All rights reserved.
引用
收藏
页码：436 / 447
页数：12
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