Impedance working group meeting 8 February 2018 Mario Beck Thanks to Mike Barnes Fritz Caspers Hugo Day Aaron Farricker Giovanni Rumolo Benoit Salvant ID: 778475
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Slide1
MKE – Simulation model update
Impedance working group meeting - 8 February 2018 - Mario Beck
Thanks to:
Mike Barnes
,
Fritz
Caspers
,
Hugo Day, Aaron Farricker, Giovanni
Rumolo
,
Benoit
Salvant
,
Vasileios
Vlachodimitropoulos, Christine
Vollinger
, Carlo Zannini
Slide2Outline
MKE model
History
ImprovementsValidation of the modelConclusion & outlook
8 February 2018
Mario Beck - MKE simulation model
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Slide3MKE model - History
2013: The MKE model was presented
2015: The MKE model was updated but only taken into account in the trans. Imp. model
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Mario Beck - MKE simulation model3
MKE-L without
serigraphy not in model
as not in machine
Slide4MKE model
2017: The MKE model was updated taking into account the experience gained during the MKP model development
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Factor two betweenthe impedances of
both models for the
broadband frequency
Slide5MKE model
The serigraphy was shortened (200mm to 180mm) to reduce the power loss by chancing the serigraphy resonance peak
8 February 2018
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That leads to a higher
broadband impedance
(as the coupling is weakened)
Slide6Validation: MKE-L 200mm ser.
The
real
part of the simulation and the measurements are in very good accordance up to ~1.3 GHz.
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Mario Beck - MKE simulation model6
Measured the
06.02.2017.
From here on all
Simulations are with
the 2017 model
Slide7Validation: MKE-L 200mm ser.
The imaginary part of the
simulation and the measurements
are in very good accordance up to ~1.6 GHz.
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Measured the
06.02.2017.
Slide8Validation:
MKE-S 180mm
ser.
The real part of the simulation and the measurements are in very good accordance up to ~1 GHz.
8 February 2018Mario Beck - MKE simulation model
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No information about
measurement available;
Poorly matched?
Slide9Validation: MKE-S 180mm ser.
The imaginary part of the simulation and the measurements
not in good accordance for frequencies over 500
MHz.
8 February 2018Mario Beck - MKE simulation model
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No information about
measurement available;
Poorly matched?
Slide10Validation: Comparison
The
predicted increase in broadband impedance is confirmed by the measurements
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Slide11Validation: Comparison
The resonance peaks are well reproduced by the simulations.
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Slide12Conclusion & outlook
The kicker model has been gradually improved and is very well advanced
Validation with bench measurements is satisfactory
However, the model does not explain the degree of heating of the kicker observed during
operationIt is planned to re-measure the MKE-L with the 200mm serigraphy and
cables, capacitors and short circuit to observe their influence of the resonance frequencyThe impact of the longitudinal impedance of the current models on the beam dynamics has to be
evaluated
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Slide13Thanks for your attention!
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Slide14Validation: Comparison
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Slide15Validation: Comparison
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Slide16Heating of the SPS kicker
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10.10.2017 03h05
MKE 200mm
MKE 180mm
MKP-S
MKP-L
Observations
during scrubbing MD
from 09 to 10.10.2017
Slide17The early model was used to calculate the impedance used in the longitudinal impedance model
The improvements of the serigraphy:
The finger width of 5mm was
change to the 2mm in realityA small layout error was correctedThe serigraphy modeling waschanged from massive, thin
PEC to tabulated surfaceimpedance material (with the
conductivity of silver)
What was improved?
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This point had the biggest impact!
Slide18Serigraphy layout8 February 2018
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l
ferrite200 = 230mm
lfinger200 = 195mml
overlap200
= 170mm
l
ferrite180
= 230mm
l
finger180
= 175mm
l
overlap180
= 130mm
Slide19What was improved?
Also the model had a
different ferrite (4A4 instead of 8C11)
and no GND bus bar8 February 2018Mario Beck - MKE simulation model19
2013 MKE-L model
2017 MKE-L model
GND-bar