Coupler Position Simulations

The full geometry of the position cavity was used in a lossy eigenmode computation to simulate the effects of moving the coupler. The full experimental results are at ClicCouplerPosition.

simql.png qfitcomp.png

simfreq.png freqcomp.png

In simulation, the coupling is more sensitive to the feedthrough-waveguide spacing but the frequency is less sensitive. This may be due to the rounded ends of the feedthrough not being modelled accurately in simulation.

Mesh Dependence

The split in mode frequencies is due to the accuracy of the meshing. The dependence of the mode splitting and resonant frequency on mesh density is shown below. The accuracy is not sufficient for temperature simulations and so for these, the mesh will be made symmetric and dense and the solution may have to be third order.

fracmesh.png freqmesh.png

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Topic revision: r2 - 08 Mar 2012 - FrancisCullinan

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