Beam Coupling Impedances of Obstacles Protruding into Beam Pipe

Details Beam Coupling Impedances of Obstacles Protruding into Beam Pipe Beam Coupling Impedances of Obstacles Protruding into Beam Pipe

1996-09-23

arxiv.org/abs/acc-phys/9609006v2

Phys.Rev.E55:3529-3532,1997

Physics

Accelerator Physics

4 pages, LaTeX (REVTeX), 2 figures (eps); corrected and revised, comparison with simulations added; presented at PAC97 (Vancou

Scientific paper

10.1103/PhysRevE.55.3529

The beam coupling impedances of small obstacles protruding inside the vacuum chamber of an accelerator are calculated analytically at frequencies for which the wavelength is large compared to a typical size of the obstacle. Simple formulas for a few important particular cases, including both essentially three-dimensional objects like a post or a mask and axisymmetric irises, are presented. The analytical results are compared and agree with three-dimensional computer simulations. These results allow simple practical estimates of the broad-band impedance contributions from such discontinuities.

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