CST outcoming Informations acquired during the CST EU

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CST outcoming Informations acquired during the CST EU conference 2017

CST outcoming Informations acquired during the CST EU conference 2017

Use support tickets • Create your own user in online support area ü ü

Use support tickets • Create your own user in online support area ü ü ü click on the drop down menu on the top right (near to ? ) choose online support area leave the cern basic information and click next insert your personal data in the form (name mail ecc) confirm by email • Use support tickets for your ticket. CST support could also help you to set your simulation with the best parameters

Tetraedral mesh for wakefield solver - NO • It is not in the near

Tetraedral mesh for wakefield solver - NO • It is not in the near future projects But. . With CST 2017 the eigenmode solver supports the open boundary!

Similar model with different results • An example could be a vacuum with background

Similar model with different results • An example could be a vacuum with background PEC and a vacuum with cylinder of PEC and backgound PEC a b looking at the two CST file CST support noticed that the mesh of the 2 simulations was really different, they suspected that this is the reason for the differences in the two results. Suggestion: for any structure perform the simulations with a mesh more and more refined until the difference between two simulations with different mesh refinement is almost 0 (simulation converges). If, after reached this point , the simulations of structures a and b still give different results open a ticket

Small structure inside a big structure • CST seems to problems simulating structures with

Small structure inside a big structure • CST seems to problems simulating structures with a large size difference in components in frequency domain - for a example a thin wire inside a large diameter pipe. the issue is that the meshing seems correct but it's known for a fact that the results are incorrect. Use the equilibrate mesh for a smoother mesh Mesh global properties -> Special -> equilibrate mesh ratio (we found good mesh setting the parameter to 1. 2)

Click on Mesh Global properties Click on special Insert the values in smooth mesh

Click on Mesh Global properties Click on special Insert the values in smooth mesh with the equilibrate ratio

before after

before after

Bellow with and without beam pipe • The question was about why the structure

Bellow with and without beam pipe • The question was about why the structure a and b gives different results a b they supposed that the difference is caused by the fields that prolongate outside the bellow and it is not taken in the correct consideration with the first structure. They suggested to use also the field monitors to verify the fields. It is also possible to use CST support for asking advice for the best simulation parameters

lumped radius • There is a parameter called "radius" when defining a lumped element,

lumped radius • There is a parameter called "radius" when defining a lumped element, but changing this number seems to do nothing in simulation. It appears as if the lumped element always looks like a very small radius wire lumped radius is only for I simulations, they will change the documentations to explain better this point

VBA macro for postprocessing For the automatic calculation of the shunt impedance in the

VBA macro for postprocessing For the automatic calculation of the shunt impedance in the post processing they suggested us to use the VBA macro

Adaptive mesh refinement • The wakefield solver has the adaptive mesh refinement • We

Adaptive mesh refinement • The wakefield solver has the adaptive mesh refinement • We asked for an improvement: the possibility to make an adaptive mesh refinement that would loop (with local and/or global mesh refinement) until there are no PEC cells or surfaces in the model. • They will take into account this suggestion