17–22 May 2026
C.I.D
Europe/Zurich timezone

Improved resistive wall effective radius taking into account Yokoya factors

WEP5091
20 May 2026, 16:00
2h
C.I.D

C.I.D

Deauville, France
Poster Presentation MC5.D04: Beam Coupling Impedance Theory, Simulations, Measurements, Code Development Poster session

Speaker

Alexis Gamelin (Synchrotron soleil)

Description

When computing resistive wall impedance or wake function for a whole accelerator, one must take into account the variation of beam pipe aperture, conductivity, and beta function. This can be done either by summing the different contributions or by computing the so-called "effective radius," which is then used in an analytic formula to get the resistive wall impedance for the full accelerator. But the usual definition of the "effective radius" formula has some limitations: it does not take into account the influence of one plane on the other plane (e.g. horizontal plane on vertical radius), there is no formula for quadrupolar or monopolar wakes, and the longitudinal effective radius is only approximate. The present paper introduces an improved definition of the resistive wall "effective radius", which overcomes these limitations by making use of Yokoya factors.

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Author

Alexis Gamelin (Synchrotron soleil)

Co-authors

Vadim Gubaidulin (Synchrotron soleil) Sudhanshu Thakur (Deutsches Elektronen-Synchrotron DESY)

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