This article presents an analysis of the load capacity of the bolt joints of collecting electrodes with the rapper rod, made in HUCK technology. A discrete model of the system of electrodes was worked out for the analysis of stresses in bolt joints, the validation of which was made on the basis of measurement data obtained on the test bench. Two variants of joining the plates of electrodes with the rapper rod were taken into account in calculations -the first one with the correct geometry in the rapper rod, the other one with an eccentric displacement of holes in the flat bars of the rapper rod. In both variants the modelled system was loaded with the impulse force corresponding to the impact of the hammer against the anvil, with the run obtained from measurements on the test bench. These models and the related calculations were performed in the ABAQUS environment. As a result of the analyses performed, recommendations were worked out intended to eliminate cases of the destruction of bolt joints closest to the anvil of the rapper rod.
Accelerating cavities exchange HOM power through interconnecting beam pipes in case of signal frequencies above the cut-off of their propagating waveguide modes. This may lead either to improved HOM damping or -in the case most severe -to unwanted phase coherence of fields to the beam. Therefore the knowledge of the scattering properties of a cavity as a line element is needed to analyse all kinds of RF cavity-cavity interaction. Since there is a lack of measurement tools capable to provide a multidimensional scattering matrix at a given frequency point, we have been developing a method for this purpose. It uses a set of 2-port S-parameters of the device under test, embedded in a number of geometrically different RF environments. The application of the method is demonstrated with copper models of TESLA cavities.
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