Analytical expression for position sensitivity of linear response beam position monitor having inter-electrode cross talk

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• 作者：Mukesh Kumar^a ; ^b ; ^{mukeshk@rrcat.gov.in} ; A. Ojha^a ; A.D. Garg^a ; T.A. Puntambekar^a ; V.K. Senecha^b ; ^c
• 关键词：Shoe-box BPM ; Position sensitivity ; Inter electrode cross talk ; Capacitive coupling
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2017
• 出版时间：1 February 2017
• 年：2017
• 卷：844
• 期：Complete
• 页码：90-95
• 全文大小：1035 K
• 卷排序：844

文摘

According to the quasi electrostatic model of linear response capacitive beam position monitor (BPM), the position sensitivity of the device depends only on the aperture of the device and it is independent of processing frequency and load impedance. In practice, however, due to the inter-electrode capacitive coupling (cross talk), the actual position sensitivity of the device decreases with increasing frequency and load impedance. We have taken into account the inter-electrode capacitance to derive and propose a new analytical expression for the position sensitivity as a function of frequency and load impedance. The sensitivity of a linear response shoe-box type BPM has been obtained through simulation using CST Studio Suite to verify and confirm the validity of the new analytical equation. Good agreement between the simulation results and the new analytical expression suggest that this method can be exploited for proper designing of BPM.