1 / 17

Rough calculation HFSSv10

Rough calculation HFSSv10. Only had enough time during LINAC08 to do a quick calculation using HFSSv10 for the analytical S modematching formula applied to a curved cavity rather than a sharp NWN transition

amity
Download Presentation

Rough calculation HFSSv10

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Rough calculation HFSSv10 • Only had enough time during LINAC08 to do a quick calculation using HFSSv10 for the analytical S modematching formula applied to a curved cavity rather than a sharp NWN transition • HFSSv10 is limited in its mesher (amongst other things) – it cannot use a user defined gradiated rounded surface i.e. “segment number” does not exist in HFSSv10, so only rough shapes can be made. Here simulation calculated in HFSSv10; Using Discrete sweep (Fast sweep failed); segment number=0; 10MHz sweep step; First order elements; 12676 mesh elements; 0.015% convergence; time 2 hours 44mins

  2. Remodelled and recalculated in HFSSv11 • HFSSv11 has a better mesher i.e. “segment number” is a user definable quantity • Recalculated S matrix for a TESLA middle cell using HFSSv11 • Renormalised with respect to 50Ohms on the ports • Converted output file for processing

  3. Better Geometry Finer mesh HFSSv11 Here simulation calculated in HFSSv11; Using Discrete sweep (Fast sweep failed); segment number=10; 1MHz sweep step; First order elements; xxxxx mesh elements; xxxx convergence; time~6days for sweep…. Data from this run has been lost due to an HFSS crash…. All that remains is the exported S matrix data

  4. Comparison to HFSSv8.5 eigen calculation • Comparision with HFSSv8.5 revels 10MHz shift in dispersion curve using default First order elements in HFSSv11

  5. %Tesla_Mono_S_Dispersion_1 clear all close all format long tic ModeLook=1 %HFSSLibary=['Linac08_TeslaMid_S_Mono'] %HFSSLibary=['Linac08_TeslaMid_S_Mono_renormalised'] HFSSLibary=['Linac08_TeslaMid_S_Sweep_Mono_Renormalise_Fix'] %Linac08_TeslaMid_S_Sweep_Mono_Renormalise_Fix.m LibSize=size(HFSSLibary,1) %size of the HFSS libary CascadeName='Tesla_Mono_Dispersion' %user defined file name to which the matr

  6. %Tesla_Mono_S_Dispersion_2_HFSSv85 clear all close all format long tic ModeLook=1 %HFSSLibary=['Linac08_TeslaMid_S_Mono'] %HFSSLibary=['Linac08_TeslaMid_S_Mono_renormalised'] %HFSSLibary=['Linac08_TeslaMid_S_Sweep_Mono_Renormalise_Fix'] %HFSSLibary=['Linac08_TeslaMid_S_Mono_3_Renormalise_Fix'] %Linac08_TeslaMid_S_Sweep_Mono_Renormalise_Fix.m %Linac08_TeslaMid_S_Mono_3_Renormalise_Fix %LibSize=size(HFSSLibary,1) %size of the HFSS libary S11Name='S11renormaliseHFSSv85' S21Name='S21renormaliseHFSSv85'

  7. Segmented Tesla simulation 20 segments • The geometry is made up of a series of interconnected NW and WN segments, in the picture below the “open blue circles” are the start of a transition and the “green dots” are the end of the segments. • 20 segments for a TESLA middle cell is the roughest approximation that can be made Number of segments 20 Tesla geometry – middle cell

  8. Computation time for 20 segments 107seconds, 20nmodes and 20mmodes • Sweep range 1GHz – 1.5GHz at 0.01Ghz steps • Results have not been normalised and there is no power conservation • Band located between 1.27 and 1.29GHz – a bit lower than what we expect for the TESLA structure.

  9. %Tesla_WNW_Mid_Auto_Cascade_2 clear all close all tic format long nmode=20%20 mmode=20%10 rpoint=0 ModeLook=1 filter=1 Z0=1 fignow=1; uo=4*pi*(1E-7) eo=8.854*(1E-12) c2=1/sqrt(uo*eo) c=2.99792458*1e8 fstart=1e9%1.3e9 fstep=0.01e9 nfstep=50 fend=fstart+fstep*nfstep fnow=fstart; %Set up points to be used in each section regarding the z and r directions %for plotting purposes. numberzpoints=300 nrpoint=100 %Setup geometric parameters for a TESLA mide cell Tesla_aL=12/1000 Tesla_aR=Tesla_aL Tesla_bL=19/1000 Tesla_bR=Tesla_bL Tesla_LL=57.7/1000 Tesla_LR=57.7/1000 Tesla_Rc=42/1000 Tesla_Re=103.3/1000 Tesla_RiL=35/1000 Tesla_RiR=Tesla_RiL %Solved angles Theta1=69.467 Theta2=76.691 WNTeslaNumberM=20

  10. Segmented Tesla simulation 100 segments • The geometry is made up of a series of interconnected NW and WN segments, in the picture below the “open blue circles” are the start of a transition and the “green dots” are the end of the segments. Number of segments 100 Tesla geometry – middle cell

  11. Computation time for 100 segments 534seconds, 20nmodes and 20mmodes • Sweep range 1GHz – 1.5GHz at 0.01Ghz steps • Results have not been normalised and there is no power conservation • Band located between 1.28 and 1.3GHz – consistant with what we expect for the TESLA structure

  12. %Tesla_WNW_Mid_Auto_Cascade_2 clear all close all tic format long nmode=20%20 mmode=20%10 rpoint=0 ModeLook=1 filter=1 Z0=1 fignow=1; uo=4*pi*(1E-7) eo=8.854*(1E-12) c2=1/sqrt(uo*eo) c=2.99792458*1e8 fstart=1e9%1.3e9 fstep=0.01e9 nfstep=50 fend=fstart+fstep*nfstep fnow=fstart; %Set up points to be used in each section regarding the z and r directions %for plotting purposes. numberzpoints=300 nrpoint=100 %Setup geometric parameters for a TESLA mide cell Tesla_aL=12/1000 Tesla_aR=Tesla_aL Tesla_bL=19/1000 Tesla_bR=Tesla_bL Tesla_LL=57.7/1000 Tesla_LR=57.7/1000 Tesla_Rc=42/1000 Tesla_Re=103.3/1000 Tesla_RiL=35/1000 Tesla_RiR=Tesla_RiL %Solved angles Theta1=69.467 Theta2=76.691 WNTeslaNumberM=100%2

  13. Segmented Tesla simulation 200 segments • The geometry is made up of a series of interconnected NW and WN segments, in the picture below the “open blue circles” are the start of a transition and the “green dots” are the end of the segments. Number of segments 200 Tesla geometry – middle cell

  14. Computation time for 200 segments 1070seconds, 20nmodes and 20mmodes • Sweep range 1GHz – 1.5GHz at 0.01Ghz steps • Results have not been normalised and there is no power conservation • Band located between 1.28 and 1.3GHz – consistant with what we expect for the TESLA structure

  15. %Tesla_WNW_Mid_Auto_Cascade_2 clear all close all tic format long nmode=20%20 mmode=20%10 rpoint=0 ModeLook=1 filter=1 Z0=1 fignow=1; uo=4*pi*(1E-7) eo=8.854*(1E-12) c2=1/sqrt(uo*eo) c=2.99792458*1e8 fstart=1e9%1.3e9 fstep=0.01e9 nfstep=50 fend=fstart+fstep*nfstep fnow=fstart; %Set up points to be used in each section regarding the z and r directions %for plotting purposes. numberzpoints=300 nrpoint=100 %Setup geometric parameters for a TESLA mide cell Tesla_aL=12/1000 Tesla_aR=Tesla_aL Tesla_bL=19/1000 Tesla_bR=Tesla_bL Tesla_LL=57.7/1000 Tesla_LR=57.7/1000 Tesla_Rc=42/1000 Tesla_Re=103.3/1000 Tesla_RiL=35/1000 Tesla_RiR=Tesla_RiL %Solved angles Theta1=69.467 Theta2=76.691 WNTeslaNumberM=200

More Related