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Comparison of stretched-wire, bead-pull and numerical impedance calculations on 3.9 GHz dipole cavities

Research output: Contribution to conference - Without ISBN/ISSN Conference paperpeer-review

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Publication date1/01/2008
Number of pages3
Pages859-861
<mark>Original language</mark>English
Event11th European Particle Accelerator Conference, EPAC 2008 - Genoa, Italy
Duration: 23/06/200827/06/2008

Conference

Conference11th European Particle Accelerator Conference, EPAC 2008
Country/TerritoryItaly
CityGenoa
Period23/06/0827/06/08

Abstract

In order to verify detailed impedance and wakefield simulations, the resonant modes in an aluminium model of the 9-cell ILC crab cavity were investigated using a stretched-wire frequency domain measurement, as well as bead-pull measurements. These measurements were compared to numerical simulations in order to be confident that all possible high impedance modes have been taken into account. The analysis of the results and the accuracy and limitations of each method is presented. It is found that measurements of all of the measured higher impedance modes have R/Q values whithin an order of magnitude of the calculated values. No mode was detected with the measurements that had not been predicted using simulations.