Difference: ClicSimCouplerPos (2 vs. 3)

Revision 315 Mar 2012 - FrancisCullinan

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Coupler Position Simulations

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  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.

Low Conductivity and Lyapin Feedthrough

The simulations were repeated, once with a lower surface conductivity that brought the loaded Q down to the measured value and once with a bead at the end of the feedthrough.

lowcondq.png alcoupq.png

lowcondf.png alcoupf.png

Further work to understand these effects can be found here.


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.

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META FILEATTACHMENT attachment="fracmesh.png" attr="h" comment="" date="1331202486" name="fracmesh.png" path="fracmesh.png" size="32402" stream="fracmesh.png" user="Public.FrancisCullinan" version="1"
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META FILEATTACHMENT attachment="lowcondq.png" attr="h" comment="" date="1331807630" name="lowcondq.png" path="lowcondq.png" size="38070" stream="lowcondq.png" user="Public.FrancisCullinan" version="1"
META FILEATTACHMENT attachment="alcoupq.png" attr="h" comment="" date="1331807833" name="alcoupq.png" path="alcoupq.png" size="23755" stream="alcoupq.png" user="Public.FrancisCullinan" version="1"
META FILEATTACHMENT attachment="lowcondf.png" attr="h" comment="" date="1331808135" name="lowcondf.png" path="lowcondf.png" size="40935" stream="lowcondf.png" user="Public.FrancisCullinan" version="1"
META FILEATTACHMENT attachment="alcoupf.png" attr="h" comment="" date="1331808244" name="alcoupf.png" path="alcoupf.png" size="41204" stream="alcoupf.png" user="Public.FrancisCullinan" version="2"
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