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Eigenmode AnalysisEigenmode Analysisfor the PETRA III Cavity
W. Ackermann, H. De Gersem, T. WeilandInstitut für Theorie Elektromagnetischer Felder Technische Universität DarmstadtInstitut für Theorie Elektromagnetischer Felder, Technische Universität Darmstadt
Status ReportJune 24 2016June 24, 2016TEMF, Darmstadt
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 1
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Outline
▪ Motivation
C t ti l M d l▪ Computational Model- Drawings and geometry information
- Numerical problem formulation
▪ Cavity tuningy g- Cell radius variation for the “reliable” and “spark” models
Si l ti lt▪ Simulation results- Mode pattern and characteristic data
for the “reliable” and “spark” models
▪ Summary / OutlookSummary / OutlookJune 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 2
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Outline
▪ Motivation
C t ti l M d l▪ Computational Model- Drawings and geometry information
- Numerical problem formulation
▪ Cavity tuningy g- Cell radius variation for the “reliable” and “spark” models
Si l ti lt▪ Simulation results- Mode pattern and characteristic data
for the “reliable” and “spark” models
▪ Summary / OutlookSummary / OutlookJune 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 3
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Motivation
▪ PETRA CavitiesPh t h- Photographs
Pick-Up Loop
Waveguide-CoaxialTransition (Doorknob)
Tuning Plunger
PETRA III PETRA II
Tuning PlungerVacuum Pump
From time to time automatic switch-off of the power supply due http://mhf-e.desy.de/e519/e188812/e189242/to unexpected high fields in the cavity or waveguide system.
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 4
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Motivation
▪ Investigation Strategy- Set up model “spark” with plunger positions 9 mm modify radii r to r such- Set up model spark with plunger positions 9 mm, modify radii r1 to r7 such,
that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.
- Set up model “reliable” with plunger positions 28 mm, modify radii r1 to r7 such, that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 48” is reproduced.y p
- Use a port boundary condition for the waveguide during the tuning procedure.
- Calculate R/Q and Q values for all modes up to 1,2 GHz.- Determine max. E and max. H in the plunger slits for all nodes. Keep the energy
per mode constantper mode constant.- Use either PEC or PMC boundary conditions instead of the port boundary
condition for the waveguide during the mode calculations.
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 5
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Motivation
▪ PETRA CavitiesDesign cavity radiusr2 = r6 = 210,85 mm
9 mm 28 mm
Model spark“ Model reliable“Model „spark Model „reliable
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 6
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Motivation
▪ Bead-pulling measurement for the model “spark”
PETRA SL_Cy1
499
499
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 7
S = 11.8 mm S = 8.4 mm
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Motivation
▪ Bead-pulling measurement for the model “reliable”
PETRA SR_Cy1
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 8S = 30.0 mm S = 29.4 mm
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Outline
▪ Motivation
C t ti l M d l▪ Computational Model- Drawings and geometry information
- Numerical problem formulation
▪ Cavity tuningy g- Cell radius variation for the “reliable” and “spark” models
Si l ti lt▪ Simulation results- Mode pattern and characteristic data
for the “reliable” and “spark” models
▪ Summary / OutlookSummary / OutlookJune 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 9
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Computational Model
▪ PETRA III, 500 MHz, 7-cell CavityG t i f ti Input Waveguide- Geometry information Input Waveguide
Cavity
Pump Port Pump Port
Cavity
Tuning Plunger Tuning PlungerTuning Plunger Tuning Plunger
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut für Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 10
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Computational Model
▪ PETRA III, 500 MHz, 7-cell CavityG t i f ti Input Waveguide- Geometry information Input Waveguide
Cavity
Pump Port Pump Port
Cavity
Tuning Plunger Tuning PlungerTuning Plunger Tuning Plunger
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut für Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 11
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Computational Model
▪ PETRA III, 500 MHz, 7-cell CavityP t i f ti
Input WaveguidePort with finite number of modes
- Port information
Cavity Length ofthe waveguidethe waveguide
Length ofthe beam tube
I t C lInput CouplerWR-1800 to 6¼ inchWaveguide-CoaxialElectrically closed
Pump Port Tuning Plunger TransitionJune 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut für Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 12
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Computational Model
▪ PETRA III, 500 MHz, 7-cell CavityB t b l th- Beam-tube length
k 39 55 1/ D i 10 5kz= 39.55 1/m Damping = 10-5
Length { 174 6 232 9 291 1 349 3 } mm10-3 10-4 10-5 10-6
Length 300 mm!Damping
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut für Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 13
Length = { 174.6, 232.9, 291.1, 349.3 } mm Length = 300 mm
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Computational Model
▪ PETRA III, 500 MHz, 7-cell CavityW id l th- Waveguide length
D i 10 5
Number of port modes = 14!
Damping = 10-5
kz= 28.89 1/m
Number of port modes 14
Length { 239 1 318 8 398 5 478 2 } mm10-3 10-4 10-5 10-6
L th 400!Damping
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut für Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 14
Length = { 239.1, 318.8, 398.5, 478.2 } mm Length = 400 mm
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Computational Model
▪ PETRA III, 500 MHz, 7-cell CavityG t i f ti (D t il f th i t l )- Geometry information (Details of the input coupler)
Alumium Oxide
Outer Conductor
Alumium OxideWindowsPhotograph
Cone
http://mhf-e.desy.de/e5/e63/
Coupling Loop Inner ConductorCourtesy ofyKathrin Cottel
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut für Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 15
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Computational Model
▪ PETRA III, 500 MHz, 7-cell CavityG t i f ti (D t il f th i t l )- Geometry information (Details of the input coupler)
Coupling LoopOuter Conductor Coupling LoopOuter ConductorPhotograph
CCone
http://mhf-e.desy.de/e5/e63/
Courtesy ofyKathrin Cottel
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut für Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 16
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Computational Model
▪ PETRA III, 500 MHz, 7-cell CavityG t i f ti (D t il f th t i l )- Geometry information (Details of the tuning plungers)
Modeling ofGuide and Spring
Neglect Cooling Channels
Photograph
Tuning PlungersTuning Plungershttp://mhf-e.desy.de/e519/e187129/
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut für Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 17
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Computational Model
▪ PETRA III, 500 MHz, 7-cell CavityG t i f ti (D t il f th t i l )- Geometry information (Details of the tuning plungers)
Modeling ofGuide and SpringGuide and Spring
C id GConsider Gapand Housing
Courtesy of Michael EbertJune 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut für Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 18
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Computational Model
▪ PETRA III, 500 MHz, 7-cell CavityG t i f ti (D t il f th t i l )- Geometry information (Details of the tuning plungers)
Modeling ofGuide and SpringGuide and Spring
C id GConsider Gapand Housing
Courtesy of Michael EbertJune 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut für Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 19
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Computational Model
▪ PETRA III, 500 MHz, 7-cell CavityG t i f ti (D t il f th t i l )- Geometry information (Details of the tuning plungers)
Spring is now fixed (only plunger movable)
Plunger position = -20 mm Plunger position = 50 mm
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut für Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 20
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Outline
▪ Motivation
C t ti l M d l▪ Computational Model- Drawings and geometry information
- Numerical problem formulation
▪ Cavity tuningy g- Cell radius variation for the “reliable” and “spark” models
Si l ti lt▪ Simulation results- Mode pattern and characteristic data
for the “reliable” and “spark” models
▪ Summary / OutlookSummary / OutlookJune 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 21
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Cavity Tuning
▪ Model “spark” Red: Bead-pulling measurement of the frequency shift
499 f = 499 779 MHz499 f = 499.779 MHz
499
Blue: Bead-pulling simulation of the frequency shift (scaled vs. position)
R = { 213.65, 210.85, 210.90, 209.85, 210.90, 210.85, 213.65 } mmdR { 0 0 0 0 0 0 0 0 0 0 0 0 0 0 }
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 22
dR = { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 } mm
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Cavity Tuning
▪ Model “spark”S iti it i f ti
Radius variation of each individual, sensitivity of:
Waveguide
- Sensitivity information, y
• frequency• field flatness
dR7dR4 dR5 dR6dR7dR6
Pump PortTuning PlungerTuning Plunger
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut für Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 23
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Cavity Tuning
▪ Model “spark”
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 24
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Cavity Tuning
▪ Model “spark” Red: Bead-pulling measurement of the frequency shift
499 f = 499 650 MHz499 f = 499.650 MHz
499
Blue: Bead-pulling simulation of the frequency shift (scaled vs. position)
R = { 213.65, 210.85, 210.90, 209.85, 210.90, 210.85, 213.65 } mmdR { 0 134 0 031 0 069 0 246 0 075 0 013 0 087 }
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 25
dR = { 0.134, -0.031, 0.069, 0.246, 0.075, 0.013, 0.087 } mm
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Cavity Tuning
▪ Model “reliable” Red: Bead-pulling measurement of the frequency shift
f = 500 119 MHzf = 500.119 MHz
Blue: Bead-pulling simulation of the frequency shift (scaled vs. position)
R = { 213.65, 210.85, 210.90, 209.85, 210.90, 210.85, 213.65 } mmdR { 0 0 0 0 0 0 0 0 0 0 0 0 0 0 }
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 26
dR = { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 } mm
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Cavity Tuning
▪ Model “reliable”
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 27
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Cavity Tuning
▪ Model “reliable” Red: Bead-pulling measurement of the frequency shift
f = 499 650 MHzf = 499.650 MHz
Blue: Bead-pulling simulation of the frequency shift (scaled vs. position)
R = { 213.65, 210.85, 210.90, 209.85, 210.90, 210.85, 213.65 } mmdR { 0 295 0 147 0 320 0 462 0 322 0 152 0 292 }
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 28
dR = { 0.295, 0.147, 0.320, 0.462, 0.322, 0.152, 0.292 } mm
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Cavity Tuning
▪ Model “spark”C it t i
Port
- Cavity cut view
- Input coupler cut view
- Waveguide cut viewAccelerating Mode
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 29
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Cavity Tuning
▪ Model “spark”C it t t d
Port
- Cavity truncated
- Input coupler cut view
- Waveguide cut view
Accelerating Mode
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 30
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Outline
▪ Motivation
C t ti l M d l▪ Computational Model- Drawings and geometry information
- Numerical problem formulation
▪ Cavity tuningy g- Cell radius variation for the “reliable” and “spark” models
Si l ti lt▪ Simulation results- Mode pattern and characteristic data
for the “reliable” and “spark” models
▪ Summary / OutlookSummary / OutlookJune 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 31
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Simulation Results
▪ Probe Locations for Maximum Field Determination
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 32
3420 sample points per plunger Grid spacing ~ 5 mm
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Simulation Results
▪ Probe Locations for Maximum Field Determination
Probes equally distributed on a cylinder jacket inside the plunger slitsplunger slits.
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 33
Grid spacing ~ 5 mm
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Simulation Results
▪ Resonance Frequency (all calculated modes)
MH
zue
ncy
/ MFr
eq
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 34
Mode Index
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Simulation Results
▪ Resonance Frequency (first forty modes)
MH
zue
ncy
/ MFr
eq
Significant frequency shift for the first two modes.
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 35
Mode Index
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Simulation Results
▪ Quality Factor (all calculated modes)
oral
ity F
acto
Qu
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 36
Mode Index
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Simulation Results
▪ On Axis R / Q (all calculated modes)
s)Q
(on
axis
R /
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 37
Mode Index
![Page 38: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/38.jpg)
Simulation Results
▪ Off Axis R / Q (all calculated modes)
tion)
in x
-dire
ctsh
ift 5
mm
(o
ff ax
is, s
R /
Q
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 38
Mode Index
![Page 39: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/39.jpg)
Simulation Results
▪ Off Axis R / Q (all calculated modes)
tion)
in y
-dire
ctsh
ift 5
mm
(o
ff ax
is, s
R /
Q
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 39
Mode Index
![Page 40: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/40.jpg)
Simulation Results
▪ Maximum Field Values in the Plunger Slits (all modes)
Slit
/ V/m
n Pl
unge
r SSt
reng
th in
tric
Fiel
d S
Max
Ele
ct
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 40
Mode Index
![Page 41: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/41.jpg)
Simulation Results
▪ Maximum Field Values in the Plunger Slits (all modes)
Slit
/ A/m
n Pl
unge
r SSt
reng
th in
neti
Fiel
d S
Max
Mag
n
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 41
Mode Index
M
![Page 42: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/42.jpg)
Simulation Results
▪ Field Classification and Mode CorrelationE l ti Th li it- Evaluation oncircular lines
- Three lines per cavitydZ = ± 50 mm
- R = 100 mm
- 60 samples per line- 60 samples per line
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 42
![Page 43: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/43.jpg)
Simulation Results
▪ Field Classification and Mode Correlation
Model “ReliableE” Model “SparkE”
Model “ReliableH” Model “SparkH”Model ReliableH Model SparkH
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 43
![Page 44: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/44.jpg)
Simulation Results
▪ Mode CorrelationM d l “ li bl ”- Model “reliable”
Model “ReliableE”
Model “ReliableH”E
Inde
x E
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 44
Index H
![Page 45: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/45.jpg)
Simulation Results
▪ Mode Correlation144 modes identified(56 modes rejected)
ReliableEReliableH
MH
z 116 modes skipped
eque
ncy
/
E3 H3
Fre
E4 H4
Example: Modes 3 – 5 rejectedE5 H5
Example: Modes 3 5 rejected
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 45Mode Index
![Page 46: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/46.jpg)
Simulation Results
▪ Mode CorrelationMode E99 Mode H99
Mode E100Mode E100
No corresponding mode available
Mode E101 Mode H100
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 46
![Page 47: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/47.jpg)
Simulation Results
▪ Field Classification
Mode 6
agni
tude
Monopole
Ma
Azimuthal Order
Mode 7
nitu
de
Monopole
Mag
n
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 47Azimuthal Order
![Page 48: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/48.jpg)
Simulation Results
▪ Field Classification
agni
tude
Mode 1
Dipole
Ma
Azimuthal Order
weighted mean = 1 65
nitu
de
Mode 78weighted mean 1.65
Dipole?Quadruople?
Mag
n
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 48
Quadruople?
Azimuthal Order
![Page 49: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/49.jpg)
Simulation Results
▪ Field Classification
upper:
ency Azimuthal Order
Quadrupole
upper:Model “ReliableE”
Freq
ue
Dipole
Quadrupole
lower:
Monopole
lower:Model “ReliableH”
• Small white dot if0.01< fractional part <0.99
• Artificial vertical offset to separate the marks
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 49
Modal Index
![Page 50: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/50.jpg)
Simulation Results
▪ Mode Correlation (“reliable E, reliable H”)
Vertical shift if EM field at the port present
First monopole passband: modes 6 - 12
mm
) in
Ohm
mm
, y=5
mR
/Q (x
=0
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 50
Index
![Page 51: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/51.jpg)
Simulation Results
▪ Mode Correlation (“reliable E, reliable H”)Mode E6 Mode H6
Mode E7 Mode H7Mode E7 Mode H7
Mode E8 Mode H8Mode E8 Mode H8
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 51
![Page 52: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/52.jpg)
Simulation Results
▪ Mode Correlation (“spark E, spark H”)First monopole passband: modes 6 - 12
Vertical shift if EM field at the port present
mm
) in
Ohm
mm
, y=5
mR
/Q (x
=0
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 52
Index
![Page 53: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/53.jpg)
Simulation Results
▪ Mode Correlation (“spark E, spark H”)Mode E6 Mode H6
M d E7 M d H7Mode E7 Mode H7
Mode E8 Mode H8Mode E8 Mode H8
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 53
![Page 54: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/54.jpg)
Simulation Results
▪ Mode Correlation (“reliable H, spark H”)First monopole passband: modes 6 - 12
mm
) in
Ohm
mm
, y=5
mR
/Q (x
=0
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 54
Index
![Page 55: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/55.jpg)
Simulation Results
▪ Eigenmodes in the Frequency Range from 3.8 to 3.9 GHz
Reliable ESpark E
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 55
![Page 56: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/56.jpg)
Simulation Results
▪ Eigenmodes in the Frequency Range from 3.8 to 3.9 GHz
Reliable E, 821 modesSpark E, 874 modes
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 56
![Page 57: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/57.jpg)
Simulation Results
▪ Eigenmodes in the Frequency Range from 3.8 to 3.9 GHz
Reliable E, 821 modesSpark E, 874 modes
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 57
![Page 58: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/58.jpg)
Simulation Results
▪ Eigenmodes in the Frequency Range from 3.8 to 3.9 GHz
Reliable E, 821 modesSpark E, 874 modes
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 58
![Page 59: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/59.jpg)
Outline
▪ Motivation
C t ti l M d l▪ Computational Model- Drawings and geometry information
- Numerical problem formulation
▪ Cavity tuningy g- Cell radius variation for the “reliable” and “spark” models
Si l ti lt▪ Simulation results- Mode pattern and characteristic data
for the “reliable” and “spark” models
▪ Summary / OutlookSummary / OutlookJune 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 59
![Page 60: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/60.jpg)
Summary / Outlook
▪ Summary:Precise modeling of the PETRA III cavity including pump- Precise modeling of the PETRA III cavity including pump ports, tuning plunger and input coupler
- Eigenmode analysis performed up to 1.2 GHz(mode pattern, frequency, R/Q, Q via power loss, slit field)( p , q y, , p , )
- Mode classification w.r.t. the azimuthal orderR/Q of the fundamental monopole passband- R/Q of the fundamental monopole passbandsensitive to model change from “spark” to “reliable”
▪ Outlook:Calculation of monopole passband with port BC?- Calculation of monopole passband with port BC?
June 27, 2016 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Wolfgang Ackermann | 60
![Page 61: EigenmodeAnalysis for the PETRA III Cavity€¦ · that the fundamental mode oscillates at 499,65 MHz and the bead-pull measurement “Cavity Nr. 23” is reproduced.-Set up model](https://reader033.vdocument.in/reader033/viewer/2022042318/5f073b167e708231d41bf5e1/html5/thumbnails/61.jpg)