Simulation of 200 MHz RF cavities 11 cells

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Simulation of 200 MHz RF cavities. 11 cells preliminary results Alexej Grudiev 20/04/2016

Simulation of 200 MHz RF cavities. 11 cells preliminary results Alexej Grudiev 20/04/2016

HFSS setup: 3 D model from Ton Port 1 Port 2 Port 6 Port

HFSS setup: 3 D model from Ton Port 1 Port 2 Port 6 Port 5 Port 4 Port 3

Comparison measurements vs CST MS vs HFSS Very good agreement between CST MS and

Comparison measurements vs CST MS vs HFSS Very good agreement between CST MS and HFSS for S-parameters

HFSS: Eigenmode. Mesh and E-field of f 0=628. 5 MHz mode PML PML

HFSS: Eigenmode. Mesh and E-field of f 0=628. 5 MHz mode PML PML

HFSS: Eigenmodes: Ez (red), Ey (blue) 9π/11 -mode π-mode 10π/11 -mode 8π/11 -mode

HFSS: Eigenmodes: Ez (red), Ey (blue) 9π/11 -mode π-mode 10π/11 -mode 8π/11 -mode

HFSS eigenmode: Modes parameters table, 2 nd order tetr. , 12 iterations (~10% error

HFSS eigenmode: Modes parameters table, 2 nd order tetr. , 12 iterations (~10% error in R/Q) f [MHz] Q R/Q Z [Ohm] [linac. Ohm] 1 620. 2 160 3. 2 2 622. 3 5891 0. 055 3 623. 0 17351 13. 85 4 624. 5 14359 0. 91 5 625. 2 518 29. 3 6 626. 9 6451 15. 28 7 628. 6 473 29. 43 8 631. 0 57 8. 41 9 631. 4 261 5. 55 10 634. 4 445 0. 23 Definitions: R/Q = Vz 2/ωU Circuit impedance Z=R/Q*Q/2 256 162 120156 6533 7589 49286 6960 240 724 51

Plane wave excitation setup: d. Ypw=1 mm Comp. Mag. E in log scale: f=630

Plane wave excitation setup: d. Ypw=1 mm Comp. Mag. E in log scale: f=630 MHz

E-field on axis with PW excitation: d. Ypw = 1 mm; f=630 MHz

E-field on axis with PW excitation: d. Ypw = 1 mm; f=630 MHz

E-field on axis with PW excitation: d. Ypw = 1 mm; f=622. 86 MHz

E-field on axis with PW excitation: d. Ypw = 1 mm; f=622. 86 MHz (Highest Q-factor) 10π/11 -eigenmode f 0=623. 0 MHz Q = 17400

CST wake setup 3 D model from Ton Mesh is good but still might

CST wake setup 3 D model from Ton Mesh is good but still might be not good enough to describe narrow band 200 MHz rejection filter. So 200 MHz impedance might be different from FEM codes or measurements

CST wake, longer wake

CST wake, longer wake

CST impedance (FFT, cos^2 filter) df = 1/Tmax=c/s_max =3 e 8/300 = 1 MHz,

CST impedance (FFT, cos^2 filter) df = 1/Tmax=c/s_max =3 e 8/300 = 1 MHz, better

Comparison of Re{Zl} between HFSS eigenmode, HFSS plane wave and CST wakefield

Comparison of Re{Zl} between HFSS eigenmode, HFSS plane wave and CST wakefield

Ey 30 MHz xy 100 MHz 200 MHzEy 30 MHz xy 100 MHz 200 MHz
795 5 MHz 788 MHz LTE 15 MHz795 5 MHz 788 MHz LTE 15 MHz
144 Mhz 144 148 Mhz 430 440 Mhz144 Mhz 144 148 Mhz 430 440 Mhz
1 Simulation Simulation Simulation Computer Model Simulation Simulation1 Simulation Simulation Simulation Computer Model Simulation Simulation
200 MHz and 800 MHz LLRF cost estimate200 MHz and 800 MHz LLRF cost estimate
WITNESS Simulation simulation simulation simulation part Seat ArrivalWITNESS Simulation simulation simulation simulation part Seat Arrival
Cells Plant Animal Cells What are cells CellsCells Plant Animal Cells What are cells Cells
Cells Animal cells Plant cells Specialised cells OrganisationCells Animal cells Plant cells Specialised cells Organisation
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1024 MHz vs 512 MHz Bands for VLBI1024 MHz vs 512 MHz Bands for VLBI
10301090 MHZ SECURITY MONITORING SYSTM 10301090 MHz SECURITY10301090 MHZ SECURITY MONITORING SYSTM 10301090 MHz SECURITY
406 MHz ELTs and 406 MHz Antennas Presented406 MHz ELTs and 406 MHz Antennas Presented