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Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics Scattering Parameter Calculation for.

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Presentation on theme: "Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics Scattering Parameter Calculation for."— Presentation transcript:

1 Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics Scattering Parameter Calculation for the 2x7 Superstructure TESLA Collaboration Meeting INFN Frascati May 26-28, 2003 Karsten Rothemund, Dirk Hecht, Ulla van Rienen

2 Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics 2x7-Superstructure 7 Cell TESLA Cavity HOM-Coupler Input-Coupler Images: I.Ibendorf Radius Adapter

3 Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics 2x7-Superstructure Images: I.Ibendorf Rotation (couplers) Shift of reference planes (MAFIA simulation has tubes on both sides)

4 Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics Radius Adaptor 57 mm 39 mm f = 1.5 – 3.0 GHz: TTF beam pipe superstructure TE 11 (deg.) TM 01 TE 21 (deg.)

5 Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics HOM-Input-Coupler antenna cone shape as in 9 cell HOM coupler (no data available in drawing) Geometry data taken from drawing „Formteil F“ ( /D.001),[1] [1] coutesy DESY

6 Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics HOM-Coupler (HOM 2 + HOM 3) HOM 2 HOM 3HOM 1 Input rotate HOM 3 shift planes 27.4 mm

7 Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics 7 Cell TESLA Cavity f= GHz TE11 TM01 TE21 Plot: MWS, simulation: MAFIA, 2D, time domain f/GHz |S..|/dB f/GHz |S..|/dB

8 Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics Analytical Sections Rotation between HOM-Couplers Rotate reference frame of dipole and quadrupole modes length of section is 0 Wave Guide (neg. and pos.) shift reference plane of cavity shift HOM 3 to correct position

9 Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics Subsections SubsectionPort-Modes# of this type HOM-Input-coupler HOM coupler TESLA cavity Plane shift cavity Shift of HOM Rotation Radius adaptor Total number of subsections:17 Total number of modes = S-matrix dimension:174 (to be computed for each frequency point)

10 Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics CSC-Computation Calculation of overall S-matrix open ports: beam pipe, 3x HOM-, 1x Input-coupler 1500 values computed in GHz frequency range shown here: GHz (3 rd dipole passband) 481 frequency-points + interpolation S-values of 7-cell cavity f/GHz |S..|/dB

11 Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics Results Coupling between HOM1 and HOM2 to beam pipe modes HOM1 HOM2 downstream beam pipe upstream beam pipe f/GHz |S..|/dB f/GHz |S..|/dB

12 Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics Results Coupling between HOM couplers Coupling between Input-coupler and beam pipe modes f/GHz |S..|/dB f/GHz |S..|/dB

13 Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics Timing S-Parameter CST-MicrowaveStudio TM (2.4 GHz Pentium 4, 4GB RAM): HOM-Input-Coupler: 316,160 mesh points (20 lines/lambda), 5 beam pipe modes + 2 koaxial modes Total computation time: 100 h (12 runs) HOM-Coupler: 178,920 mesh points (20 lines/lambda), 5 beampipe modes + 1 koaxial mode Total computation time: 24 h (11 runs) MAFIA (SUN Enterprise, 400 MHz, 4GB RAM): TESLA 7 cell cavity: 2D-geometry (rz) 31,158 mesh points Total computation time: 2h + 6.5h h

14 Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics Timing CSC CSC: platform: Mathematica subsections 5 modes in structure dimension of matrix: frequency points, 2.46 – 2.58 GHz 430 s on Pentium 3 (1 GHz, 512 MB RAM)

15 Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics Summary S-parameter of 2x7 TESLA-Superstructure have been calculated (an open structure) with CSC 5 modes have been considered in the structure S-parameter of subsections were computed with CST-MicrowaveStudio TM (coupler sections, 3D) MAFIA (TESLA cavity, 2D-rz-geometry) analytically (shifting planes, rotation) some exemplary coupling parameters have been presented computation times for S-parameters of subsections in order of days additional computation times whole structure then in the order of minutes parameter tuning (e.g. rotation angles, distances) possible


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