“School of ILSF”
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| Paper IPM / ILSF / 16814 |
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Inhomogeneity of vacuum chamber components is the main source of coupling impedance. Nowadays, wake impedances are mostly predictable by 3D codes and analytical prediction of impedance theories can be helpful as a side solution. On the other hand, some asymmetries in the geometry of components might make troubles and lead to imprecise numerical results in 3D simulations. Analytical approximation of discontinuities, holes and grooves can give us an estimation of expected results and can be used as a benchmark in the case that we do not have any experimental data. To clarify the validity of theoretical expressions, general discontinuities are simulated in CST Particle Studio. The comparison of final results is presented here. At last, Resistive Wall impedance and some general discontinuities of components at ILSF storage ring are compared form the theoretical and simulation point of view. INTRODUCTION Pumping holes, resistive walls (RWs) [1], flange gaps [2], beam position monitors (BPM) [3-5], bellows and tapers[6] can be named as the previously designed ILSF storage ring components. Our aim in this report is to compare the simulation results of these components with theoretical models. This study is categorized in 4 parts: ï· Resistive Walls ï· Tapers ï· Holes ï· Rectangular grooves.
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