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Combined impedance meeting
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Europe/Zurich
Combined impedance meeting 21 April 2016
Present: Olav, Francesco, Carolina, Edoardo, Alexej, Hugo, Mario
Comments to talk of Francesco
- Alexej: Laplace theorem cannot be applied in this case if there is a conductor inside.
- Alexej: cannot say that impedance is obtained with wire. What is obtained is S21 and some formulae are needed to compute back the impedance. New formulae need to be derived.
- Alexej: interesting results, qualitative view of fields, but how to extract quantitiative results. Not trivial.
- Alexej: no dipole excitation. Hugo: maybe if look at S41?
- Method of image charge to get a good matching.
- Distancebetween wires does matter in the relativecontribution of higher order components with respect to the first order.
- Alexej: there should be a mutual inductance and mutual capacitance between the two wires. Why a transformer? Talk to Vaccaro.
- Hugo: measure and simulate in kickers instead of cavity could be more relevant.
- Usefulness with respect to current methods? Not clear. However interesting to access
- Next steps: get the formula to recompute the impedance, measure to see if it can work.
Mario and Hugo summarized the MKP strategy meeting that took place yesterday. Main points:
- Beam induced dynamic pressure rise could be electron cloud as observed to condition with time. Could lose conditioning if replacing again by yet another spare.
- EM/Thermal simulations in good agreement for reproducing the observed temperature at the ground plate
- Temperature interlock could be increased by 10C following these simulations since ferrite temperature is simulated to be about 10 to 15C higher from the ground plate temperature.
- aC coating could be implemented on the ceramic spacer used to apply the serigraphy. Alexej proposed to assess the impact of the coating on impedance.
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