Goudket, P. and Beard, C. and McIntosh, P. and Burt, G. and Dexter, A. and Jones, R. M. (2008) Comparison of stretched-wire, bead-pull and numerical impedance calculations on 3.9 GHz dipole cavities. In: 11th European Particle Accelerator Conference, EPAC 2008, 2008-06-232008-06-27.
Full text not available from this repository.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.