Numerical Calculations of Field Enhancements due to Small Grooves

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Presentation transcript:

Numerical Calculations of Field Enhancements due to Small Grooves Tetsuo ABE (KEK) 5th Collaboration Meeting on X-band Accelerator Structure Design and Test Program @SLAC, USA 2011-05-18

Computation of RF Fields by CST-MWS ~ Geometry and Definition ~ (v2011.02) e.g. Gap=20mm, D=30mm Rectangular Waveguide with fcutoff(TE10) = 10 GHz 1.0mm 15.0mm 3 Parameters to Describe the Groove Gap ~ D Simulating: - Chamfer of the Quadrants - etc. R=50mm (fixed)

Meshing Parameters and Mesh-Size Dependence FDSolver.Method "Hexahedral Mesh" Mesh.MeshType "PBA" ‘(Perfect Boundary Approx.) Mesh.LinesPerWavelength “300" Mesh.AutomeshRefineAtPecLines "True", “RAPL" FDSolver.AccuracyHex "1e-6" RAPL=2 (default) RAPL=5 R=50mm

RAPL=2 (default) (PEC) (Vac) X (X<0 ) 0 (X>0) Using a function: “GetFieldVectorSurface()”  Better field interpolation scheme on PEC surfaces RAPL=2 (default) (PEC) (Vac) X (X<0 ) 0 (X>0)

RAPL=5(Adopted) (PEC) (Vac) Emax X (X<0 ) 0 (X>0)

Results Gap D R=50mm

Check the Results(1): E-Static Fields by CST-EMS (v2011.02) 10.0mm 1.0mm 3 Parameters to describe the groove Gap ~ D R=50mm (fixed)

Meshing Parameters and Mesh-Size Dependence EStaticSolver.Method "Hexahedral Mesh" Mesh.MeshType "PBA" ‘(Perfect Boundary Approx.) Mesh. MinimumStepNumber “100" Mesh.AutomeshRefineAtPecLines "True", “RAPL" EStaticSolver.Accuracy "1e-9" RAPL=2(default) RAPL=5 R=50mm

RAPL=5(Adopted) (PEC) (Vac) Emax

Comparison of the Results ~Cross-Check of the Computations~ Good Agreements as expected

Simulation using Omega3P (by Zenghai Li) CST-MWS (T. Abe) (update) Check the Results(2): Simulation using Omega3P (by Zenghai Li) CST-MWS (T. Abe) (update) Gap (micron) D (micron) Emax / Enominal 1.21 20 1.36 10 1.37 D SLAC Omega3P (Z. Li) Gap (micron) D (micron) Emax / Enominal 1.23 20 1.40 10 1.44 Fairly Good Agreements

Magnetic Field Enhancement e.g. R=50mm, Gap=20mm, D=30mm TE10-like Mode

Conclusions Field enhancements due to small grooves with round chamfers have been computed by using CST-MWS/EMS. At least 20% enhancement for R=50mm round chamfers. Increases to 40% enhancement as the D size increases to 25mm. More simulation studies to be done Conductor surfaces damaged by BD/discharge Etc.

End of the Slides