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18.05.2014 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Dip.-Ing. Cong Liu | 1 Various approaches to electromagnetic.

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Präsentation zum Thema: "18.05.2014 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Dip.-Ing. Cong Liu | 1 Various approaches to electromagnetic."—  Präsentation transkript:

1 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Dip.-Ing. Cong Liu | 1 Various approaches to electromagnetic field simulations for RF cavities Cong Liu

2 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Dip -Ing. Cong Liu | 2 Outline Cavity modeling in CST MICROWAVE STUDIO® Field simulation in time domain Field simulation in frequency domain Detection of the eigenmodes in the transmission spectrum Future work

3 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Dip.-Ing. Cong Liu | 3 SPL Cavity Modeling in CST MICROWAVE STUDIO®

4 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Dip.-Ing. Cong Liu | 4 Field Simulation in Time Domain Field probe Field excitation

5 Field Simulation in Time domain Probe Time Signal | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Dip.-Ing. Cong Liu | Time / ns

6 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Dip -Ing. Cong Liu | 6 Field Simulation in Time Domain Using the Fourier transform => Transmission spectrum dipole passband monopole passband Frequency / GHz

7 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Dip -Ing. Cong Liu | 7 Field Simulation in Frequency Domain Calculation of the resonance frequencies and the corresponding eigenmodes

8 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Dip -Ing. Cong Liu | 8 Field Simulation in Frequency Domain The TM010 Pi-mode for particle acceleration

9 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Dip -Ing. Cong Liu | 9 Field Simulation in Frequency Domain The TM010 Pi-mode for particle acceleration

10 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Dip -Ing. Cong Liu | 10 Detection of the Eigenmodes in Transmission Spectrum The modes of the TM010 band Result from time domain Result from frequency domain Frequency / MHz Magnitude (db)

11 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Dip -Ing. Cong Liu | 11 Detection of the Eigenmodes in Transmission Spectrum The modes of the TM110 band Frequency / GHz Result from frequency domain Result from time domain Magnitude (db)

12 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Dip -Ing. Cong Liu | 12 Future Work Simulation with higher resolution by means of higher order curvilinear elements Detection of all higher order modes (HOMs) in the transmission spectrum up to 3 GHz Damping consideration for HOM-couplers

13 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 13 Cavity Simulations Particle accelerators -FLASH at DESY, Hamburg TESLA 1.3 GHz TESLA 3.9 GHz

14 Problem definition -Geometry | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 14 Elliptic Cavity with Couplers TESLA 3 rd harmonic 9-cell cavity including couplers

15 Problem definition -Accelerating field | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 15 Fundamental Mode TESLA 3 rd harmonic 9-cell cavity including couplers z EzEz Longitudinal electric field strength

16 Problem definition -Accelerating field | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 16 High Precision Field Calculations TESLA 3 rd harmonic 9-cell cavity including couplers Determine the accelerating -mode with high precision

17 Problem definition -Geometry -Task | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 17 Simulation Setup TESLA 3 rd harmonic 9-cell cavity including long beam tubes PEC boundary condition Search for the - mode field distribution Grid: CST – STUDIO SUITE ® 1 W

18 Problem definition -Geometry -Task | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 18 Parallelisation on Cluster Computer Distribution on 64 nodes ParMeTiS and VTK TESLA 3 rd harmonic 9-cell cavity including long beam tubes Search for the - mode field distribution Grid: CST - Studio Suite ®

19 Simulation results | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 19 Electric Field on Cavity Axis |E z | ExEx EzEz EyEy cells, unsymmetric mesh

20 Simulation results | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 20 Higher Resolution cells, unsymmetric mesh ExEx EyEy |E z | EzEz

21 Mesh has to be Symmetric Transversal grid information - Cut plane plots | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 21 Iris Equator unsymmetric mesh generation

22 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 22 Construction of Symmetric Mesh Symmetric mesh generation Coaxial coupler Higher order mode coupler (HOM) HOM Beam tube TESLA 9 cell cavity Idea: 1) Meshing performed only on ¼ of the model 2) Copy mesh to assemble the full information CST - Studio Suite ®

23 Mirror Symmetric Mesh Transversal grid information - Cut plane plots | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 23 Iris Equator symmetric mesh generation

24 Transversal Forces on Particles Simulation results -TESLA 3.9 GHz | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 24 ExEx z z FxFx FyFy EyEy c 0 B y c 0 B x Contributions to the force for a particle moving with speed of light along the axis

25 Integrated forces Integrated Forces | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 25 Quantity used to characterize the fields (kick factors)

26 Integrated forces Resulting Kick Factors | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 26 TESLA 3.9 GHz (lower resolution)TESLA 3.9 GHz Full: Upstream: Downstream: Full: Upstream: Downstream: Cells DOFs Cells DOFs

27 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 27 Summary / Outlook Summary: -Request for precise modeling of electromagnetic fields in resonant structures including small geometric details such as high power / HOM coupler -Geometric modeling with CST STUDIO SUITE ® -Kick factor calculation for TESLA 1.3 GHz and 3.9 GHz Outlook: -Detailed study of longitudinal and transversal fields for accurate beam dynamics simulations for SPL / ESS?

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