Prediction and suppression of two-point 1st order multipacting

被引：9

作者：

Zheng, Z. ^{[1
,2
]}

Facco, A. ^{[1
,3
]}

Liu, Z. ^{[1
]}

Popielarski, J. ^{[1
]}

Saito, K. ^{[1
]}

Wei, J. ^{[1
]}

Zhang, Y. ^{[1
]}

机构：

[1] Michigan State Univ, Facil Rare Isotope Beams, E Lansing, MI 48824 USA

[2] Tsinghua Univ, Beijing 100084, Peoples R China

[3] Ist Nazl Fis Nucl, Lab Nazl Legnaro, Padua, Italy

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2014年 / 735卷

基金：

美国国家科学基金会;

关键词：

Multipacting; SRF cavities; Coaxial couplers; Prediction; Suppression;

D O I：

10.1016/j.nima.2013.09.052

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A method is developed to facilitate the prediction of the power levels for which two-point multipacting occurs and their corresponding locations for coaxial power couplers. The method is cross-checked with particle-in-cell 3D simulations and RF testing of cyromodules at the Facility for Rare Isotope Beams (FMB) [1] where multipacting barriers were found during RE conditioning of Half-Wave Resonators (HWR) and the high RF power input couplers. Measurements with other types of coaxial power couplers also validate the method of prediction. A feasible geometrical optimization for the FRIB coaxial coupler is presented, which mitigates the multipacting according to this method. In the appendix, we also show that cyclotron model is suitable for two-point lit order multipacting in an elliptical cavity, Quarter Wave Resonators (QWR) and HWR. (C) 2013 Elsevier B.V. All rights reserved

引用

页码：596 / 601

页数：6

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