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
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Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics
Scattering Parameter Calculationfor the 2x7 Superstructure
TESLA Collaboration Meeting
INFN Frascati May 26-28, 2003
Karsten Rothemund, Dirk Hecht, Ulla van Rienen
Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics
2x7-Superstructure
-e
7 Cell TESLA Cavity
HOM-Coupler
Input-Coupler
Images: I.Ibendorf
Radius Adapter
Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics
2x7-Superstructure
-e
Images: I.Ibendorf
Rotation(couplers)
Shift of reference planes(MAFIA simulation has tubes on both sides)
Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics
Radius Adaptor
57 mm39 mm
f = 1.5 – 3.0 GHz:TE11co
TM01co
TE21co
f =1.54106GHz
f =2.01317GHz
f =2.55643GHz
TTF beam pipe superstructure
TE11 (deg.) TM01 TE21 (deg.)
Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics
HOM-Input-Coupler
antenna cone shape as in9 cell HOM coupler(no data available in drawing)
Geometry data taken from drawing „Formteil F“ (3 99 9177/D.001),[1]
[1] coutesy DESY
Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics
HOM-Coupler (HOM 2 + HOM 3)
HOM 2
HOM 2HOM 3 HOM 1
Input
rotate
HOM 3
shift planes
27.4 mm27.4 mm
Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics
7 Cell TESLA Cavity
f=1.5-3.0 GHz
TE11
TM01
TE21
Plot: MWS, simulation: MAFIA, 2D, time domain
f/GHz
|S..|/dB
f/GHz
|S..|/dB |S..|/dB
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
Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics
Ursula van Rienen, Universität Rostock, FB Elektrotechnik und Informationstechnik, AG Computational Electrodynamics
Timing CSC
CSC: platform: Mathematica 4.117 subsections 5 modes in structuredimension of matrix: 174481 frequency points, 2.46 – 2.58 GHz430 s on Pentium 3 (1 GHz, 512 MB RAM)
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
• 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